JP2005303977A - Data processing apparatus for controlling video recording and video quantity - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To distinguish whether or not an object of photographing is video being an object of copyright protection, and to restrict its recording if the object is video being an object of copyright protection. <P>SOLUTION: A data processing apparatus can write a video stream related to video on a recording medium. The data processing apparatus comprises: a signal acquisition section for acquiring a video signal related to the video; a type identification section for identifying a type of the video based on the video signal, the type of the video being determined in accordance with picture counts of the video displayed per unit time; a stream generator for generating a video stream based on the video signal; a controller for determining, on the basis of the type of the video, whether to disable the writing of the video stream or to enable the writing of the video stream with lowered video quality; and a writing section for controlling, on the basis of the decision of the controller, the writing of the video stream to the recording medium. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a technique for receiving a signal such as video and audio, generating a data stream, and writing it on a recording medium such as an optical disk.

  Conventionally, a technique for recording and reproducing an image on a film such as a silver salt film is known. For example, a movie is an image (film image) of a film material that is filmed and shown using film. A general movie is shot at a frame rate of 24 frames per second.

  On the other hand, NTSC (National Television Standards Committee) video (NTSC video) adopted in television broadcasting in Japan and the United States is taken at about 30 frames per second (more precisely 29.97 frames per second). Since an image of one frame is composed of images of two fields (odd field and even field), NTSC video is captured and reproduced at about 60 fields per second (more precisely, 59.94 fields per second).

  In order to record film images created at 24 frames per second using NTSC equipment, the film images from 24 frames per second are converted to NTSC images at 30 frames and 60 fields per second (so-called telecine conversion). Therefore, it is necessary to ensure the consistency of both images.

  FIG. 31 shows an example of telecine conversion using the 2-3 pull-down method. In the 2-3 pull-down method, a 5-field image of NTSC video is generated from two frames of film video. Specifically, a three-field image of NTSC video is generated from the first frame (A) of the film video, and a two-field image is generated from the second frame (B). Similarly, a three-field image is generated from the third frame (C), and a two-field image is generated from the fourth frame (D). By repeating this process up to the 24th frame, a 60-field image is obtained. The 2-3 pull-down method is widely used when a film image is played back on a television or the like conforming to the NTSC method.

  Here, a process of recording an NTSC video converted from a film video of 24 frames per second by a 2-3 pull-down method on a medium (for example, a DVD-RAM disk) will be considered. For example, Patent Document 1 discloses a recording / reproducing apparatus having a pull-down detection circuit in order to efficiently encode a video signal.

  FIG. 32 shows a functional block configuration of a conventional recording / reproducing apparatus 320. The recording / reproducing apparatus 320 receives an NTSC video signal (2-3 pulldown signal) converted by the 2-3 pulldown method, and a pulldown detection unit 1103 detects a duplicated field at the time of conversion. The control unit 1201 instructs the moving image stream generation unit 1102 to remove the detected field as a redundant field. The moving picture stream generation unit 1102 omits the designated field and encodes only the necessary field. As a result, a moving image stream of film video is generated. The recording unit 1200 writes the moving image stream to the DVD-RAM disk 131 via the pickup 130. The input 2-3 pull-down signal may include a separate audio signal.

  In the recording / reproducing apparatus 320, the reproducing process is performed as follows. Based on an instruction from the playback control unit 1203, the playback unit 1202 reads a moving image stream from the DVD-RAM disk 131 via the pickup 130. The video stream decoding unit 1111 decodes the read video stream of the film video and performs a 2-3 pull-down conversion process to output it as an NTSC video, and outputs the video signal of the NTSC video as a video signal. Output from the unit 1110. When the moving image stream includes audio data, the moving image stream decoding unit 1111 also decodes the audio data and outputs an audio signal from the audio signal output unit 1112.

In recent years, DV standards, DVD standards, and the like have been established, and camera performance has been improved. For example, consumer-use high-performance video cameras capable of shooting high-definition video have been commercialized at an affordable price, making it easy to shoot high-quality video. In addition, with the widespread use of recording / playback devices using digital recording media such as DVD recorders, personal computers (hereinafter referred to as PCs), the Internet, etc., there is an environment in which various moving picture contents including movies can be distributed without deteriorating. It is getting ready.
JP-A-5-183864

  With the spread of equipment, illegally created / reproduced content (so-called “pirated” content) without the consent of the copyright owner is circulating, threatening the rights of the copyright owner. For example, content that shoots a movie being shown in a movie theater with a video camera is on the market. Since a movie that is the subject of shooting generally has a copyright, it is necessary to take measures to protect the copyright. In particular, if a movie being screened is shot using a high-performance video camera capable of shooting a high-definition video, a high-quality movie that can withstand viewing will be duplicated, and urgent measures are required. .

  An object of the present invention is to determine whether or not a subject to be photographed is a video subject to copyright protection, such as a movie, and to restrict the recording when the subject is a video subject to copyright protection.

  The first data processing apparatus according to the present invention can record a video stream related to video on a recording medium. The data processing device is a signal acquisition unit that acquires a video signal related to the video, and a type specification unit that specifies a video type based on the video signal, wherein the video type is per unit time of the video Whether to prohibit recording of the video stream based on the type of the video, a type generation unit that is determined according to the number of displayed pictures, a stream generation unit that generates a video stream based on the video signal, Alternatively, a control unit that determines whether to permit recording of a video stream with reduced video quality, and a recording unit that controls recording of the video stream on the recording medium based on the determination of the control unit. ing.

  The control unit may prohibit the recording of the video stream when the video type is a movie.

  The data processing apparatus further includes an adjustment unit that selects video quality based on the video type. The stream generation unit may generate a video stream of video having the selected video quality.

  When the video type matches a predefined type, the control unit permits recording of a video stream with a reduced video quality, and the adjustment unit is lower than a preset video quality Video quality may be selected.

  When the video type does not match a predefined type, the control unit permits recording of a video stream maintaining the video quality, and the adjustment unit has the same video quality as the preset video quality. You may choose.

  The adjustment unit may select the video quality with respect to resolution.

  The type specifying unit continuously receives the video signal, detects whether or not the first image and the second image constituting each picture of the video match, and based on the detection result And a discriminator for discriminating the type of the video.

  The detection unit includes a first memory that stores data of the first image, a second memory that stores data of the second image, data in the first memory, and data in the second memory. For comparison, a comparison unit for detecting coincidence / mismatch between the first image and the second image may be provided.

  The determination unit may continuously receive the detection result and specify the type of the video based on a pattern in which a match and a mismatch appear.

  The data processing device generates management information that generates discrimination information indicating whether the video is encoded at a first resolution or a second resolution lower than the first resolution, and manages the information in association with the video stream The unit is further provided. The recording unit may further record the discrimination information on the recording medium.

  The management information generation unit manages a plurality of contents including a set of associated discrimination information and the video stream, and the data processing device extracts discrimination information from each of the contents, and You may further provide the management file production | generation part which produces | generates the content management file which has an entry.

  The second data processing apparatus according to the present invention can read a video stream related to video from a recording medium and output a video signal. The video stream and management information are recorded on the recording medium. The management information includes discrimination information indicating whether the video is encoded with a first video quality or a second video quality lower than the first video quality. A data processing device reads the video stream and the management information from the recording medium, extracts the discrimination information from the management information, and based on the discrimination information, the first video quality and the second video An extraction unit for generating quality display data indicating which quality is present, a decoding unit for decoding the video stream to generate a video signal, and an output unit for outputting the quality display data and the video signal in association with each other And.

  The discrimination information indicates that the video is encoded with the second video quality when the video type matches a predefined type, and when the video type does not match, the video is the first video quality. It may indicate that it is encoded with.

  The data processing device may further include a superimposition processing unit that superimposes the quality display data on the video signal, and the output unit may output the video signal on which the quality display data is superimposed.

  The output unit may include a video signal output unit that outputs the video signal and a display output unit that displays the quality display data.

  In the recording medium, a plurality of sets of the discrimination information and the set of video streams are associated and stored as content, and each discrimination information is stored in a content management file having an entry for each content, The extraction unit may extract each determination information from the content management file, and generate list data for displaying the content corresponding to each entry and the quality display data in association with each other.

  The data processing method according to the present invention can record a video stream related to video on a recording medium. The data processing method includes a step of obtaining a video signal related to the video and a step of specifying a video type based on the video signal, wherein the video type is set to a number of displayed pictures per unit time of the video. And a step of generating a video stream based on the video signal, and a video stream in which recording of the video stream is prohibited or video quality is reduced based on the video type Determining whether to permit recording of the video stream, and controlling recording of the video stream onto the recording medium based on the determination.

  The controlling step may prohibit recording of the video stream when the video type is a movie.

  The data processing method may further include selecting a video quality based on the video type, and the generating the video stream may generate a video stream of the video having the selected video quality. Good.

  When the video type matches a predefined type, the determining step allows recording of a video stream with reduced video quality, and the selecting step is based on a preset video quality. A lower video quality may be selected.

  According to the present invention, when the type of video determined according to the number of displayed pictures per unit time is detected and it is determined that the subject of shooting is a movie or the like that is a copyrighted work, the recording is prohibited or encoded. By recording at a reduced resolution, recording at the initially set resolution is prohibited. As a result, the quality of the copyrighted work can be reduced to prevent faithful reproduction, so that infringement of the copyright of the content can be prevented and the content can be contributed to protection.

  Embodiments of a data processing apparatus according to the present invention will be described below with reference to the accompanying drawings. In the following embodiments, the data processing apparatus will be described as a video camera.

  In this specification, it demonstrates using the term defined as follows.

  Video: An image displayed by switching a plurality of pictures one after another at a predetermined vertical scanning frequency. The video includes characters, graphics, and the like such as moving images, still images, and subtitles. For example, the vertical scanning frequency of a video that switches 30 pictures per unit time (1 second) is 30 Hz.

  Picture: A frame image composed of two field images of odd lines and even lines in the interlace method. In the progressive method, one frame image. A picture is a concept that represents both a frame and a field. One picture of the video (particularly one picture of the video recorded on the film) may be called “one frame”. A general movie is not an interlace system, and displays 24 pictures (frames) per second.

  SD (Standard Definition) video: Standard quality video (NTSC 480i video, PAL 576i video).

  HD (High Definition) video: refers to high-definition video (for example, high-definition video) other than the SD video.

  Tables 1 and 2 below show more specific examples of SD video and HD video moving images. The 24p or 23.976p HD video in Table 2 is called a film material video.

(Embodiment 1)
FIG. 1 shows a functional block configuration of the video camera 1 according to the present embodiment. The video camera 1 can record the captured video as HD video or SD video on a recording medium (DVD-RAM disk 131 in FIG. 1). The video camera 1 can also reproduce video and audio recorded on the recording medium using a monitor or a speaker attached to the video camera 1.

  The video camera 1 includes a camera unit 100, a microphone 101, a moving image stream generation unit 102, a control unit 105, a recording unit 106, a video signal output unit 110, an audio signal output unit 111, and a moving image stream decoding unit 112. A playback control unit 115, a playback unit 116, a video type identification unit 119, and a pickup 130. Although the DVD-RAM disk 131 shown in FIG. 1 is not a constituent element of the video camera 1, when a hard disk or the like built in the video camera 1 is employed as a recording medium instead of the DVD-RAM disk 131. The hard disk becomes a component of the video camera 1.

  Hereinafter, each component of the video camera 1 will be described, and then the operation of the video camera 1 will be described.

  First, components related to the recording function of the video camera 1 will be described.

  The camera unit 100 receives light from a subject to be photographed and generates, for example, an NTSC interlaced digital video signal. That is, the video camera 1 uses the camera unit 100 to obtain a digital video signal. The camera unit 100 includes, for example, an optical system such as a lens, a CCD element, and an analog / digital (AD) converter (not shown). The light received by the camera unit 100 includes light reflected on the screen and reflected from the screen in this embodiment, in addition to the light reflected upon a person, an article, a landscape, and the like. In other words, the video camera 1 may take a picture of a movie or the like projected on the screen as a shooting target. When shooting a general movie in which 24 pictures are displayed per second, the camera unit 100 uses a CCD element to make the field frequency higher than NTSC 60 Hz (or 1/60 second). The camera shoots at a shutter speed that provides a fast and appropriate exposure, and outputs an NTSC interlace video signal. This video signal is in an analog format. The AD converter converts this video signal from an analog format to a digital format and outputs it.

  The microphone 101 receives the sound being shot and generates an analog audio signal. An AD converter (not shown) of the microphone 101 converts this audio signal from an analog format to a digital format and outputs it.

  The moving image stream generation unit 102 encodes the digital video signal and audio signal in a predetermined encoding format. FIG. 2 shows a functional block configuration of the moving image stream generation unit 102. The video stream generation unit 102 receives a video signal and an audio signal at input terminals 1301 and 1302, respectively. The MPEG-Video encoding unit 1303 generates encoded video data in the MPEG-Video format from the video signal. The audio encoding unit 1304 generates encoded audio data in, for example, AC-3 format from the audio signal. The MPEG-Video encoding unit 1303 and the audio encoding unit 1304 generate data according to the recording format. For example, any of the encoding units 1303 and 1304 divides the encoded video data and encoded audio data into data units corresponding to the recording format, adds headers and the like, and generates video packets and audio packets. Video packets and audio packets are temporarily stored in the multiplexing buffer units 1305 and 1306, respectively. The multiplexing processing unit 1307 multiplexes the video packets and audio packets stored in the multiplexing buffer units 1305 and 1306, generates an MPEG-2 program stream, and outputs it from the output terminal 1308.

  Note that although the video stream is described as including video data and audio data, in this specification, it is only necessary to include video data. The MPEG-2 program stream is an example of a system stream defined by the MPEG2 system standard (ISO / IEC 13818-1). In addition to the program stream (PS), the system stream defines a transport stream (TS) and a PES stream. The present invention is applicable even when the moving picture stream is an MPEG-2 transport stream. In the present embodiment, the data structure of these streams is not particularly problematic, and the description thereof is omitted.

  Next, the video type identification unit 119 will be described with reference to FIG. FIG. 3 shows a functional block configuration of the video type identification unit 119. The video type identification unit 119 receives a video signal from the camera unit 100 and identifies the type of video based on the video signal. The “video type” is determined according to the number of pictures displayed per unit time (1 second) of the video. In this embodiment, the type of video is a movie that displays 24 pictures per second, a television broadcast that displays 30 frames per second (60 fields), and the like.

  The video type identification unit 119 includes a detection unit 103 and a determination unit 104. The detection unit 103 includes a first memory 1031, a second memory 1032, and a comparator 1033.

  The video signal input to the detection unit 103 is input and stored in the first memory 1031 and the second memory 1032. Each of the two memories 1031 and 1032 can store image data of one picture. For example, the memories 1031 and 1032 can store data of each field image when one picture is composed of two field images. The comparator 1033 compares the stored contents of the first memory 1031 and the stored contents of the second memory 1032 at the display time interval (about 1/60 seconds) of one field image, and outputs the comparison result. The comparison is performed by calculating the difference between the storage contents of the first memory 1031 and the storage contents of the second memory 1032, and whether or not it becomes 0, that is, whether it is a match or mismatch is output as a comparison result. Since the video signal may contain noise, the difference may be calculated after removing the noise using a digital filter or the like.

  Note that since one picture corresponds to one frame image in progressive video, the first memory 1031 and the second memory 1032 can store data for each frame image. When a camera adopting the progressive method is used, a progressive method image is output, and frame image data is stored in the memories 1031 and 1032 at a rate of 60 frames per second based on the signal and is used for comparison.

  FIG. 4 shows an example of the operation timing of each functional block of the detection unit 103. When an NTSC interlace video signal is input, the memory 1031 and 1032 store two field image data of odd lines and even lines constituting the picture, respectively. The memories 1031 and 1032 update the stored contents at the same cycle as the number of frames per second (about 30 frames per second), as indicated by “storage timing”. The memories 1031 and 1032 perform an updating operation while maintaining a phase difference (timing deviation) of one field (about 1/60 second). The comparator 1033 compares the data in each memory at a time (every 1/60 seconds) indicated as “comparison timing” when the clock of 60 Hz rises and falls. As a result, the result is output by the next “comparison timing”. The comparison timing comes after the memories 1031 and 1032 have completed updating the stored contents. In FIG. 4, the comparator 1033 performs the comparison after each storage operation of the memories 1031 and 1032 through a period indicated as “timing adjustment”. For example, when the comparison result is “match”, the comparator 1033 outputs a value indicating “0”, and when it is “mismatch”, the comparator 1033 outputs a value indicating “1”.

  FIG. 5 shows processing in the video camera 1 when a person, landscape, or the like is photographed by the video camera 1. As a result of continuously capturing images, NTSC interlaced field images A, B, C... Are output from the camera unit 100. At this time, the first memory 1031 stores the data of the even field images B, D, F. The second memory 1032 stores data of odd field images A, C, E. The comparator 1033 compares at the rising and falling timings of the pulse. In the example shown in FIG. 5, since the storage timings of the first memory 1031 and the second memory 1032 are shifted by the time of one field image and the same data is not stored at the same time, the outputs of the comparators 1033 are all inconsistent. It becomes.

  FIG. 6 shows processing in the video camera 1 mainly when a movie projected on the screen is shot by the video camera 1. Since the images A, B, C,... Of each picture (frame) constituting the movie are updated every 1/24 seconds, the CCD element of the camera unit 100 has A, B, B, B, C, C, D, D, D... Field image video signals are generated. As a result, for example, the storage content of the first memory 1031 is updated to the data of “frame B” at the switching time (time t1) from “frame A” to “frame B”. At this time, the data of “Frame A” is already stored in the second memory 1032.

  When the predetermined time L1 elapses after the update operation of the first memory 1031, the comparator 1033 performs the comparison operation. The stored contents at this time are “frame B” in the first memory and “frame A” in the second memory, so that the comparison result is “mismatch”. This comparison result is held until the next comparison.

  At time t2 after about 1/60 second from time t1, the second memory 1032 stores the data of frame B. At this time, both the first memory 1031 and the second memory 1032 store the data of “frame B”. Therefore, the comparison result of the comparator 1033 at the falling edge of the pulse after the lapse of time L2 from the time t2 becomes “match”.

  At time t3, which is about 1/60 seconds after time t2, the video signal of frame B continues to be output from the camera unit 100. Therefore, the first memory 1031 stores the data of “frame B” again, The two memories also store “Frame B” data. Since this state has not changed even during the comparison operation after the time L3 has elapsed from time t3, the comparison result is “match”.

  On the other hand, after 1/24 seconds have elapsed from time t1, the subject to be photographed is switched from “Frame B” to “Frame C”. Therefore, at the subsequent time t4 (1/60 seconds after time t3), the data of “frame C” is stored in the second memory 1032. Even during the comparison operation after the time L4 has elapsed from time t4, the first memory 1031 stores data for “frame B” and the second memory 1032 stores data for “frame C”. The result is “mismatch”.

  Thereafter, when the stored contents of the memories 1031 and 1032 are sequentially updated and the comparison is performed, a comparison result in which “match” and “mismatch” are repeated in a predetermined order in a period D is obtained.

  The detection unit 103 repeats the above comparison and outputs a comparison result.

  The determination unit 104 of the video type identification unit 119 continuously receives the comparison result of the detection unit 103 and determines whether or not the pattern in which “match” and “mismatch” appear matches the specific pattern. The “specific pattern” is a pattern that appears when a subject to be photographed is an image of 24 pictures per second (that is, a movie). In the present embodiment, the “match” and “mismatch” patterns shown in section D of FIG. 6 are specific patterns. The specific pattern can be obtained in advance by actually shooting a movie or the like, and is stored in a read-only memory (not shown) of the determination unit 104, for example.

  As shown in FIG. 5, when there is a continuous mismatch in the comparison result of the detection unit 103, the determination unit 104 determines that the subject to be imaged is not a video of 24 pictures per second because it does not match the specific pattern. On the other hand, in the comparison result, when matching and mismatching are repeated in the order as shown in FIG. 6 and with the period D, it is determined that the shooting target is a video of 24 pictures per second, that is, a movie. The determination unit 104 outputs a value indicating the number of displayed pictures per second (for example, “24”) or a flag value indicating whether the picture is a movie as a determination result. As a result, the type of video to be photographed can be specified.

  In FIG. 6, the switching timing of the picture B of the video to be photographed coincides with the switching timing of the camera output, but this is for convenience of explanation. Even when those timings are shifted, the above description is similarly applied.

  Refer to FIG. 1 again. Based on the output from the determination unit 104, the control unit 105 determines whether to permit or prohibit recording of the moving image stream, and instructs the recording unit 106. Specifically, when the determination result output from the determination unit 104 indicates that the movie is a movie, the control unit 105 determines that the shooting target is a movie and prohibits recording of a moving image stream. In other cases, recording of a video stream is permitted. The reason for prohibiting the recording of the moving picture stream is that a copyright to be protected is generally generated in the movie, and the recording of the moving picture stream corresponding to the reproduction of the movie is prohibited to protect the copyright.

  The recording unit 106 controls recording of a moving image stream on the DVD-RAM disk 131 based on the determination of the control unit 105. Specifically, the recording unit 106 does not record the moving image stream when the control unit 105 prohibits the recording of the moving image stream. When it is not prohibited, the recording unit 106 writes the file to the DVD-RAM disk 131 via the pickup 130. The written video stream is managed as a time-series data file on the file system. The moving image stream is also called time series data.

  Next, components related to the playback function of the video camera 1 will be described.

  The playback control unit 115 instructs reading of the time-series data file of the moving image stream designated by the user. The playback unit 116 operates the pickup 130 to optically read out the time-series data file instructed from the playback control unit 115 and obtain it as a moving image stream. The video stream decoding unit 112 separates and decodes video data and audio data from the video stream, and generates a video signal and an audio signal. The resolution of the decoded video is the same as or lower than the resolution at the time of encoding. The video signal output unit 110 is, for example, a liquid crystal display device (not shown), and reproduces and displays a video by switching pictures one after another based on the video signal. The audio signal output unit 111 is a speaker, for example, and reproduces an audio signal as audio. Note that the video camera 1 can also output a time-series data file reproduced from the DVD-RAM disk 131 to an external device via a digital interface (not shown) compliant with the IEEE 1394 standard or the like.

  Next, recording processing of the video camera 1 will be described. FIG. 7 shows the procedure of the recording process of the video camera 1 according to this embodiment. In the following description, it is assumed that the determination unit 104 of the video type identification unit 119 outputs a value indicating the number of display pictures (24) per second when the determination result is a movie. First, in step S001, the video camera 1 generates time-series data (moving image stream). The time series data is generated when the camera unit 100 and the microphone 101 output video signals and audio signals, and the moving image stream generation unit 102 encodes them.

  In step S002, the detection unit 103 and the determination unit 104 of the video type identification unit 119 determine the number of pictures (number of frames) per second of the subject based on the video signal output from the camera unit 100.

  In step S003, the control unit 105 determines whether or not the number of frames of the video is 24 frames per second. If the number of frames is not 24 frames per second, the process proceeds to step S004, and if it is 24 frames per second, the process proceeds to step S005.

  In step S004, the control unit 105 permits the writing of the moving image stream. Upon receiving the permission, the recording unit 106 writes the moving image stream to the DVD-RAM disk 131. On the other hand, in step S005, the control unit 105 determines that the shooting target is a movie, and prohibits writing of a moving image stream. As a result, the recording unit 106 stops writing. After step S004 or step S005, the process ends.

  Note that if the subject to be photographed is a subject other than a movie (for example, the person or landscape described with reference to FIG. 5), there may be a case where there is almost no change in the motion of the subject. In such a situation, since substantially the same image data is input to the first memory 1031 and the second memory 1032, the comparison result of the comparator 1033 is repeatedly “matched”. Therefore, the discriminator 104 determines that the video is 24 frames per second when the comparison result repeats the pattern of the period D as shown in FIG. 7, and otherwise, that is, “mismatch” continues, When continuous or “disagreement” and “match” appear in a pattern (unspecified pattern) different from the pattern of the period D described above, it may be determined that the video is not 24 frames per second.

(Embodiment 2)
The video camera according to the first embodiment prohibits recording of a moving image stream of a video when the shooting target is a video of 24 pictures per second.

  The video camera according to the present embodiment records a moving picture stream with the video quality of the video being lowered when the shooting target is a video of 24 pictures per second.

  FIG. 8 shows a functional block configuration of the video camera 2 according to the present embodiment. Components common to the video camera 2 and the video camera 1 (FIG. 1) are denoted by common reference numerals. Unless otherwise specified, it is assumed that the functions and operations of the components of the video camera 2 are the functions and operations of the components to which the same reference numerals described in FIG. 1 are added.

  The video camera 2 includes a resolution adjustment unit 107 that receives the output of the video type identification unit 119 and adjusts the resolution of the video based on the output. The resolution adjustment unit 107 selects a resolution lower than the resolution set at the time of shooting by the user when the type of the video specified by the video type specifying unit 119 is a movie, and is set at the time of shooting when it is not a movie. Select the resolution that is present and maintain the resolution. For example, when the user is set to perform recording with the quality (HD image quality) of 1080i video in the NTSC format, and the number of pictures in the video is specified to be 24 per second, the resolution adjustment unit 107 The resolution is selected so as to record in NTSC 480i (SD quality). The resolution adjustment unit 107 notifies the video stream generation unit 202 of the selected resolution.

  FIG. 9 shows a functional block configuration of the moving picture stream generation unit 202. The moving image stream generation unit 202 is configured by adding the configuration of the resolution setting unit 1309 to the moving image stream generation unit 102 shown in FIG. The resolution setting unit 1309 is provided between the input terminal 1301 and the MPEG-Video encoding unit 1303. The resolution setting unit 1309 sets an encoding parameter corresponding to the resolution instructed from the resolution adjustment unit 107. The MPEG-Video encoding unit 1303 encodes the video using the parameters.

  When the moving image stream is generated, the recording unit 106 writes the moving image stream to the DVD-RAM disc 131. In the present embodiment, the control unit 105 permits the recording unit 106 to record a moving image stream, but does not prohibit it.

  FIG. 10 shows the procedure of the recording process of the video camera 2 according to this embodiment. The process of step S011 is the same as the process of step S002 of FIG. In other words, the video type identification unit 119 determines the number of pictures (number of frames) per second of the subject according to the operating principle described in the first embodiment.

  In step S012, the resolution adjustment unit 107 determines whether the number of frames of video is 24 frames per second. When the number of frames is not 24 frames per second, the process proceeds to step S013, and when it is 24 frames per second, the process proceeds to step S014. In step S013, the resolution adjustment unit 107 selects a resolution lower than the resolution set by the user.

  In step S014, the moving image stream generation unit 202 performs encoding processing at the selected resolution to generate time-series data (moving image stream). When branching from step S012, the resolution set by the user is adopted. The control unit 105 permits writing of the moving image stream, and upon receiving the permission, the recording unit 106 writes the time series data file of the moving image stream to the DVD-RAM disc 131 via the pickup 130.

  As a result of the above processing, when the shooting target is a movie image, the video camera 2 can protect the copyright of the movie by recording the moving image stream with a reduced image quality.

  In the above description, when it is determined that the shooting target is a movie based on the number of pictures (number of frames) per second, the resolution adjusting unit 107 reduces the resolution at the time of encoding (encoding). The resolution adjustment unit 107 can arbitrarily select a resolution from the range described in Table 1 above. However, any resolution may be determined as long as it complies with the video standard. The moving image stream is played according to the resolution at the time of encoding.

  Besides reducing the resolution, the message is superimposed on the video signal, the video is mosaicked and recorded, the frame rate (number of pictures per second) is reduced (for example, 5 pictures per second), and the black screen is recorded. By recording or the like, copyright infringement can be aroused during the subsequent distribution, and copyright protection can be achieved by reducing fidelity to the object to be photographed.

(Embodiment 3)
The video camera according to the present embodiment specifies the type of video to be captured, sets the resolution at the time of encoding, and generates information (discrimination information) indicating that when the video is encoded with a reduced resolution. , And recording on the recording medium together with the moving image stream.

  FIG. 11 shows a functional block configuration of the video camera 3 according to the present embodiment. The video camera 3 is different from the video camera 2 according to the second embodiment in that the video camera 3 includes a management information generation unit 108, a management file generation unit 109, a management information memory 120, a discrimination information extraction unit 121, and a superimposition process. The unit 122 is newly added. Other components are the same. In addition, the DVD-RAM disc 131 defines a management information area 132 for storing management information and an AV data area 133 for storing a moving picture stream. Below, the video camera 3 is demonstrated in relation to the above-mentioned difference.

  First, when the video stream generation unit 202 encodes a video signal with a resolution lower than the resolution set at the time of shooting, the management information generation unit 108 generates discrimination information indicating that. Details of the discrimination information will be described later with reference to FIG.

  The management file generation unit 109 generates a management file that includes the discrimination information generated by the management information generation unit 108.

  Here, the management file will be described with reference to FIG. In the present embodiment, the management file will be described as having a data structure according to a known MP4 file format. Of the data stored using the data structure, data specific to the present embodiment will be described later.

  FIG. 12 shows the relationship between the time-series data file 12 and the management file 14 according to this embodiment. The management file 14 stores management information, and the file name is “MOV001.MP4”. On the other hand, the time-series data file 12 stores a moving image stream, and the file name is “MOV001.MPG”. In this embodiment, the moving picture stream is an MPEG-2 program stream.

  In the management information, information for managing the reproduction of the video of the moving image stream stored in the time series data file 12 is stored. In the management information, information related to video is managed in units called “video tracks”. The video track includes position information (access information) for each access unit and encoding information. In the present embodiment, the determination information described above constitutes a part of the encode information and is stored in the management information. These pieces of information are generated when a moving image stream is recorded, and are used for random access when the moving image stream is reproduced. In addition, the management information includes link information that identifies the corresponding video stream. The link information is, for example, the file name (“MOV001.MPG”) of the time-series data file storing the corresponding moving image stream.

  FIG. 13 shows the data structure of the time-series data file 12 and the management file 14 recorded on the optical disc 131. The time series data file 12 includes the moving image stream 11, and the management file 14 includes management information 13. The time series data file 12 is written in the AV data area 133 of the optical disc 131, and the management file 14 is written in the management information area 132 of the optical disc 131.

  The moving image stream 11 includes a plurality of samples (P2Sample) 15. The sample 15 is configured by mixing video data and audio data. The sample 15 can be determined based on the video playback time, the data size (data amount), and the like. For example, the video playback time of the video object unit (VOBU) of DVD is 0.4. It contains video data from 1 second to 1 second. One or more sets of samples 15 are called chunks 16. FIG. 14 shows a more detailed data structure of the moving picture stream 11. Each sample 15 includes a plurality of video packs (V_PK) and audio packs (A_PK). Each pack is composed of a pack header and a PES packet storing video or audio data, and the data amount is constant (2048 bytes). For a moving picture stream as shown in FIG. 14, the video data and the audio data may be combined into a moving picture stream track and managed together in one track.

  Refer to FIG. 13 again. The management information 13 includes access information 20 and encoding information 19 in units of samples. These pieces of information are managed using a data structure called an atom structure, and are specifically described in a sample table atom (sample table atom) 18 of a movie atom (movie atom) 17. A sample is managed as a minimum management unit in a sample table atom (Sample Description Atom) 18, and access information 20 indicating a data storage position and the like is described for each sample. The encoding information 19 is defined in units of samples or chunks, and is commonly applied to video data in each unit. Note that the sample 15 and the chunk 16 are units of the moving picture stream 11 managed by the management information 13, and the data of the moving picture stream 11 is not always physically separated and defined.

  Next, the criteria by which the sample 15 and the chunk 16 are defined in the management information 13 will be described. For example, it is assumed that video data and audio data having a video playback time of about 0.4 seconds to 1 second are set as one sample (P2Sample) 15. The access information of each sample is described in the management information 13. When the resolution commonly applied to a series of videos is determined, a section corresponding to the videos is handled as one chunk 16, and encoding information 19 common to samples in each chunk is obtained. It is prescribed. An example of “a series of videos” is a continuous video shot by a video camera from the start of recording to the end of recording. In the management information 13, access information for each chunk can also be set. Although a series of video sections having the same resolution has been described as a standard for defining a chunk, the chunk may be defined by another standard that is not particularly relevant to the present invention.

  The moving image stream generation unit 202 and the management information generation unit 108 generate the moving image stream 11 and the management information 13 based on the above-described data structure and standard.

  FIG. 15 shows an atom structure of the management information 13 of the moving image file (MPEG2-PS) corresponding to FIG. The management information 13 is defined in the movie atom 17. In the movie atom 17, information such as a data size in units of frames, a data storage destination address, and a time stamp indicating reproduction timing are described for each of the encoded video data and audio data. A track atom 304 is defined for video data. Of the various atoms 305, 306, 307, etc. in the track atom 304, this specification describes the sample table atom 18 in the media atom 307. The media atom 307 is a field for storing information related to the encoded stream. For audio data, for example, a track atom 317 is defined.

  The sample table atom 18 further has a plurality of atom fields 311 to 316. Of these, attention is focused on the sample description atom 311, the sample size atom 312, the decoding time-to-sample atom 313, the sample-to-chunk atom 314, and the chunk offset atom 315.

  The sample description atom 311 defines encoding information applied to the video in the sample. The sample size atom 312 defines the data size of the sample. In the decoding time-to-sample atom 313, the video playback time of the sample is defined. In the sample-to-chunk atom 314, the number of samples included in one chunk is defined. In the chunk offset atom 315, for example, the head position (offset) of each chunk calculated from the head of the time series data file is defined. Note that “# 0” described in each atom 312 to 315 indicates that the data is for the 0th sample or chunk, and the first and second data not shown are later Continue.

  FIG. 16 shows a data unit and a chunk structure of a stream in the moving image file, and an atom (sample table atom) 18 in the management file corresponding to the moving image file. The fields in each atom 312 to 315 in the sample table atom 18 define the data size, playback time, etc. corresponding to the data unit of the stream in the moving image file and the section having the same name shown in the chunk structure. For example, “samples size # 0” shown in the sample size atom 312 defines the data size of the P2 sample (P2sample # 0) arranged at the beginning (0th) of the time-series data file 12. As shown in FIG. 16, in the sample table atom (18) of the management file, each sample, chunk, etc. of the data constituting the time series data 12 is defined.

  FIG. 17 shows the atom structure of the sample description atom 311 of the sample table atom 18 in more detail. Sample description atom 311 includes one or more sample description entries 515. A sample description entry 515 is provided for each chunk. Further, the sample description entry 515 includes encoding information 518, and as part of the encoding information 518, determination information (judgement_information) indicating whether or not the video has been encoded with a reduced resolution is described.

  FIG. 18 shows the data structure of the encode information 518. The encoding information is defined by 8 bits. The discrimination information is defined in the lower 2 bits (B0 to B1: judgement_information) of the 8 bits. The upper 6 bits are reserved bits. The discrimination information defines at least four types of information using 2 bits. Specifically, with reference to the resolution set at the time of shooting, “00” indicates that the video is encoded at that resolution, and “01” indicates that the video is encoded at a lower resolution than that resolution. Represents that. Further, in the present embodiment, “10” is defined as indicating that the video has been encoded with a resolution higher than that resolution. The meaning of “11” is undefined.

  FIG. 19 shows a range to which each discrimination information is applied, and shows sample description entries # 0 to # 3 in which each discrimination information is described. As shown in FIG. 18, the discrimination information #n (n: integer) is applied to the chunk #n, and therefore the discrimination information #n is commonly applied to the video in the chunk #n.

  FIG. 20 shows the procedure of the recording process of the video camera 3 according to the present embodiment. The processing in steps S101, S102, and S103 is the same as the processing in steps S011, S012, and S013 in FIG.

  In step S104, the moving image stream generation unit 202 performs encoding processing at the selected resolution to generate time-series data (moving image stream). Then, the management information generation unit 108 generates discrimination information. More specifically, when the process branches off from step S102, the moving picture stream generation unit 202 encodes the video with the resolution set by the user, and the management information generation unit 108 stores the discrimination information (“00”) corresponding to the processing. Generate. On the other hand, when the processing of step S103 is performed, the moving image stream generation unit 202 encodes the video with a lower resolution instructed from the resolution adjustment unit 107, and the management information generation unit 108 determines the discrimination information ( “01”) is generated. When the management information generation unit 108 generates discrimination information, the management file generation unit 109 generates management information such as encoding information including the discrimination information.

  In step S <b> 105, the recording unit 106 writes the time-series data file of the moving image stream to the AV data area 133 of the DVD-RAM disc 131 via the pickup 130 upon receiving permission to write the moving image stream from the control unit 105. In addition, the recording unit 106 writes the management file in the management information area 132 of the DVD-RAM disk 131.

  Through the above processing, when the shooting target is a movie image, the video camera 3 can protect the copyright of the movie by recording the moving image stream with a reduced image quality.

  Next, a process in which the video camera 3 reads a moving image stream from the DVD-RAM disk 131 and reproduces a video will be described.

  FIG. 21 shows the procedure of the playback process of the video camera 3 according to this embodiment. This process is executed by the user specifying the video to be played and instructing the start of playback. First, in step S201, when the playback control unit 115 instructs to read the time-series data file of the video to be played back and the corresponding management file, the playback unit 116 via the pickup 130 causes the DVD-RAM disk 131 to be read. Read time-series data file and management file. The management information memory 120 stores management files.

  In step S202, the discrimination information extraction unit 121 analyzes the management file stored in the management information memory 120, and extracts discrimination information.

  In step S203, the moving picture stream decoding unit 112 decodes the moving picture stream of the moving picture file to obtain a video signal and an audio signal. The video signal and the audio signal are output to the superimposition processing unit 122 and the audio signal output unit 111, respectively.

  In step S204, the discrimination information extraction unit 121 discriminates whether or not the video is recorded with a reduced resolution at the time of encoding based on the discrimination information. For example, when “01” is set as the discrimination information, it means that the encoding is performed with the resolution lowered. In step S <b> 205, the discrimination information extraction unit 121 creates data (display data) for displaying whether or not it is “video recorded with reduced resolution”. As the display data, for example, character data is used so that it is clear that the video is encoded with a reduced resolution.

  In step S206, the superimposition processing unit 122 superimposes the display data on the video signal to be reproduced. The video signal on which the display data is superimposed is output from the video signal output unit 110.

FIG. 22 shows a first reproduction display example on the TV monitor. The superimposed display data is displayed in the area 220 at the upper right of the screen. Display data is
Recording date: 1/1 (Thursday) 10: 10-10: 19
Video source: Camera Recording information: SD (DC)
It is. “Recording information” indicates the resolution at the time of recording, “SD” indicates the standard resolution, and “DC” indicates that recording was performed at a reduced resolution (down-converted). In FIG. 22, since the shooting target is an image (movie) of 24 frames per second, the fact that the resolution is reduced is recorded.

  FIG. 23 shows a second reproduction display example on the TV monitor. In the upper right area 220 of the screen, “HD” indicating that the video has been recorded at a high resolution without reducing the resolution is shown. FIG. 24 shows a third reproduction display example on the TV monitor. In the area 220 at the upper right of the screen, “SD” indicating that the video has been recorded at the standard resolution is shown. FIG. 24 shows an example when video is recorded at “standard resolution” from the beginning. Therefore, the shooting target is not 24 pictures per second, and the video camera 3 does not encode the video with a reduced video quality, so “DC” is not displayed.

  As described above, in the present embodiment, when the video camera 3 detects whether or not a movie or the like is a subject to be photographed and determines that the movie is a copyrighted movie or the like, the recording is performed with a reduced resolution at the time of encoding. To do. The video camera 3 holds, as management information, discrimination information indicating whether or not the video has been encoded with a reduced resolution, and performs display based on the discrimination information during reproduction. The video camera 3 can notify the user of recording at “standard resolution” regardless of whether or not encoding at “high resolution” is set at the beginning of shooting. Therefore, the user can recognize that a copyrighted work such as a movie has been mistakenly shot based on the notification, and can eliminate a mistake with a device failure.

  The discrimination information has been described as being stored for each chunk in the sample description entry 515 described in FIG. However, it can also be stored in a Track Header Atom 506 (FIG. 17). Thereby, it can be shown that there is a portion recorded in the moving image file with a reduced resolution. Moreover, since it is not necessary to define a data field for each chunk, the data size can be reduced. And it is not limited to the data structure described in FIG. Note that when playing back a recorded part with a reduced resolution when the subject to be photographed is a movie or the like, a message is superimposed on the entire screen (displayed in the upper right in the description), and a special effect (mosaic, It is possible to further reduce the fidelity to the shooting target by superimposing and outputting the watermark), or superimposing copy prohibition information (macrovision signal, etc.) during reproduction.

  In addition, based on the discrimination information, a display output unit for displaying the discrimination information on the video camera 3 is provided instead of displaying whether the video is recorded with a reduced resolution on the TV screen during video playback. May be. The display output unit is a fluorescent display tube, an LED (light emitting diode), a lamp (light bulb), or the like. A drive circuit for driving them may also be included in the display output unit. By providing the display output unit, it is not necessary to use a part of the display area of the video at the time of video playback, and necessary information can be presented to the user while solving the difficulty of viewing the playback video. In the process according to this modification, instead of the display data superimposition process in steps S205 and S206 of FIG. 21, a process of driving the display output unit is executed. Note that the output of the video signal and the output of the resolution are performed in association with each other.

(Embodiment 4)
The video camera according to the third embodiment has been described as generating discrimination information for one moving image stream and storing it in the DVD-RAM disk 131 as a part of management information.

  The video camera according to the present embodiment generates discrimination information for each of a plurality of moving image streams and stores it in the DVD-RAM disk 131 as part of each management information. Then, a content management file that centrally manages the management information corresponding to each video stream is generated and stored in the DVD-RAM disk 131. In the present embodiment, information corresponding to “discrimination information” in the third embodiment is referred to as “content discrimination information”.

  FIG. 25 shows a functional block configuration of the video camera 4 according to the present embodiment. The video camera 4 according to the present embodiment is different from the video camera 3 according to the third embodiment (FIG. 11) in that a content management file generation unit is used instead of the management file generation unit 109 and the discrimination information extraction unit 121 of the video camera 3. 209 and the content discrimination information extraction unit 221 are provided.

  However, the content management file generation unit 209 has the function of the management file generation unit 109 and further has a function of generating a content management file. The content discrimination information extraction unit 221 has the same function as the discrimination information extraction unit 121 and performs the same processing. Therefore, the video camera 4 has a function for generating information for determining whether or not the encoding process has been performed with a reduced video resolution and for notifying the user of the information.

  FIG. 26 shows the procedure of the recording process of the video camera 4 according to this embodiment. The recording process executed in the video camera 4 is substantially the same as the recording process (FIG. 20) of the video camera 3 according to the third embodiment, except for the creation or update of the content management file. Specifically, the processing from step S301 to step S306 is the same as the processing in FIG. 20 except for step S305. Therefore, description of each process is abbreviate | omitted. The “discrimination information” may be read as “content discrimination information”.

  Hereinafter, the data structure of the content management file will be described with reference to FIG. In the present embodiment, a set of a corresponding management file and time-series data file (moving image file) is referred to as “content”.

  FIG. 27 shows the data structure of the content management file 270. The content management file 270 has an entry for each content (moving image file, still image file), and centrally manages the moving image file recorded on the DVD-RAM disc 131 and its management file. For example, the entry [A] 270a is assigned to the moving image file [A] and the management file [A] as the content [A]. Similarly, the entry [B] 270b is assigned to the content [B].

  Each entry defines attribute information related to the corresponding content. The attribute information includes, for example, a recording date and time, a shooting source, a file size, link information, information on encoding processing (encoding information), and the like. The recording date and time is the date of shooting and the start / end time. The shooting source is “camera” indicating that the video camera 4 is shooting, and a channel number is described when a TV broadcast program is recorded by a DVD recorder or the like. The encoding information is the same as that described in the first embodiment, and includes “content determination information” corresponding to the determination information. Further, the encoding information may include information on “recording mode”, “encoding rate”, “resolution”, and the like.

  Similar to the discrimination information in the third embodiment, the content discrimination information is encoded with the resolution set at the time of shooting when the content discrimination information is “00”, and is encoded with the resolution lowered when the content discrimination information is “01”. Process. When the content discrimination information is “10”, the encoding process is performed with the resolution increased. The meaning of “11” is undefined.

  The content management file generation unit 209 generates the content management file shown in FIG. For example, the content management file generation unit 209 can copy the content determination information stored in the encoding information 518 of the management information 13 (FIG. 17) described in the third embodiment and store it in the content management file. This has the advantage that the management file and data can be shared.

  After the video camera 4 writes various files on the DVD-RAM disk 131, the content of the playback process for playing back video from the DVD-RAM disk 131 is also the playback process of the video camera 3 according to the third embodiment (FIG. 21). The description is also applied to this embodiment.

  In the present embodiment, a list of contents for confirming the contents recorded on the DVD-RAM disk 131 can be displayed using the contents management file. FIG. 28 shows an example of a content list display screen displayed based on the content management file.

  As described above, the content management file stores recording date and time, shooting source, encoding information, and the like. The content discriminating information extraction unit 221 extracts, for example, encoding information from these pieces of information, and generates list data for displaying each content and its resolution correspondingly. The list data is data for displaying the correspondence in the table format shown in FIG.

  Here, the item “information” in FIG. 28 is a resolution information display column in which the resolution at the time of recording is shown. In this column, “HD” indicating high-resolution recording, “SD” indicating standard-resolution recording, “SD (DC)” indicating that recording is performed at the standard resolution at a reduced resolution, and the like are described. . For example, the content determination information extraction unit 221 specifies “HD” or “SD” based on the value of the content determination information being “00” and the encoding rate. Further, when the value of the content determination information is “01”, it is determined as “SD (DC)”.

  In the present embodiment, the video camera 4 can obtain the same effect as the video camera 3 of the third embodiment, and also stores discrimination information indicating whether the recording is performed at a lower resolution in the content management file, and if necessary, Is displayed. When there is only a management file for each content, it is necessary to access and analyze each management file when displaying the list, and it takes time to display. However, storing it in the content management file can contribute to speeding up the display. .

  The following information may be further stored in each entry of the content management file. For example, by recording information indicating that the subject to be photographed changes at 24 pictures per second, information indicating the video change period (also referred to as a frame rate) of the subject, and recording 24 pictures as 30 pictures in the stream. Information indicating the presence / absence of duplicate fields / frames to be generated. By further storing these pieces of information, it becomes possible to inform the user of information related to the shooting target.

  In each of the above-described embodiments, the configuration and processing for shooting using a video camera have been described. However, the present invention can be similarly and easily applied to video signals transmitted through telecommunication lines and wireless lines such as streaming. At this time, the Ethernet terminal or the like of the data processing apparatus acquires a video signal instead of the camera unit 100 of the video camera. The data structure of the management information described in the third and fourth embodiments is an example, and the present invention is not limited to this. In the embodiment of the present invention, the example in which the field memories 1031 and 1032 are used for detecting the number of video pictures has been described. However, a frame memory or the like may be used.

  Further, in the embodiment of the present invention, the type of video to be detected is described as a movie displayed with 24 pictures per second, but this is an example. The number of detected pictures corresponding to the type of video to be detected can be arbitrarily set. Further, a certain threshold time may be set for detection, and it may be determined that the number of detected pictures corresponds when a specific pattern is detected continuously for the threshold time or longer. Thereby, it is possible to improve the reliability.

  Further, according to the present invention, it is possible to determine whether or not the captured video is a movie or the like by analyzing the content of the captured video.

  When a light receiving element such as a CCD (Charge Coupled Devices) or CMOS (Complementary Metal Oxide Semiconductor) is applied to the image sensor of the camera unit, the number of effective pixels (elements actually used for photographing) Is less than the total number of pixels (total number of image sensors). FIG. 29 shows the relationship between the range 291 of all pixels related to the image sensor 290 and the range 292 of effective pixels. In FIG. 29, the range corresponding to the total number of pixels is a shaded portion, and the range corresponding to the number of effective pixels is a blank portion.

  FIG. 30 is a schematic diagram when a movie projected on the screen is shot using the image sensor 290. When shooting a movie being shown, it is considered that the screen portion is usually shot so as to be within the effective pixel range 292. Outside the effective pixel range 292, the periphery of the screen is photographed. The screen portion is relatively bright because it reflects the light projected from the projector (movie image), but the outside is generally much darker than the screen portion because it makes the screen stand out. Therefore, there is a great difference in the brightness detected by the image sensor inside and outside the effective pixel range. It is possible to detect whether or not the photographing target is a screen using the difference.

  Furthermore, the aspect ratio of the image sensor (aspect ratio, 4 to 3, etc.), the aspect ratio of the effective pixel range at the time of shooting (4: 3 or 16: 9, etc.), and the following movie By taking the aspect ratio into consideration, it is possible to discriminate between bright and dark portions of light incident on the image sensor, and it is possible to detect it with higher accuracy. That is, the standard size is 1.33 to 1, the European standard vista size is 1.66 to 1, the American standard vista size is 1.85 to 1, and the cinesco size is 1.85 to 1.

  By analyzing the content of the captured video by such a method, it is possible to determine whether the captured video is a video such as a movie. In addition, if the determination is made together with the detection of whether or not the number of pictures per second is 24, the shooting target can be determined with higher accuracy.

  In the embodiment of the present invention, the recording is performed on an optical disk such as a DVD-RAM. However, the recording may be performed on a nonvolatile storage element such as a semiconductor memory or a magnetic recording medium such as a hard disk. Further, the MPEG2 video stream has been described as an example of the data stream to be recorded, but other video streams such as an MPEG4 video stream can also be used.

  A recording function and a reproducing function of a data processing apparatus typified by a video camera operate based on a computer program that realizes such a function. The computer program is recorded on a recording medium such as a CD-ROM and distributed in the market, or transmitted through an electric communication line such as the Internet, thereby causing the computer system to operate as a recording device and / or a reproducing device, for example. Can do.

  According to the present invention, it is detected whether or not an object photographed by the camera is a film image such as a movie, and if it falls under the film image, the recording is stopped or the image quality such as the resolution is sufficiently lowered. Record. As a result, it is possible to prevent infringement of the copyright holder of the content and protect the content.

It is a figure which shows the structure of the functional block of the video camera 1 by this embodiment. 3 is a diagram illustrating a functional block configuration of a moving image stream generation unit 102. FIG. It is a figure which shows the structure of the functional block of the video type specific | specification part 119. 7 is a diagram illustrating an example of operation timing of each functional block of the detection unit 103. FIG. It is a figure which shows the process in the video camera when a person, scenery, etc. are image | photographed with the video camera. It is a figure which shows the process in the video camera 1 when the movie projected on the screen with the video camera 1 was mainly image | photographed. 5 is a flowchart of a recording process procedure of the video camera 1 according to the first embodiment. It is a figure which shows the structure of the functional block of the video camera 2 by Embodiment 2. FIG. 3 is a diagram illustrating a functional block configuration of a moving image stream generation unit 202. FIG. 10 is a flowchart illustrating a recording process procedure of the video camera 2 according to the second embodiment. It is a figure which shows the structure of the functional block of the video camera 3 by Embodiment 3. FIG. It is a figure which shows the relationship between the time series data file 12 by Embodiment 3, and the management file 14. FIG. FIG. 3 is a diagram showing data structures of a time-series data file 12 and a management file 14 recorded on an optical disc 131. 3 is a diagram illustrating a more detailed data structure of a moving image stream 11. FIG. It is a figure which shows the atom structure of the management information 13. FIG. It is a figure which shows the data unit and chunk structure of the stream in a moving image file, and the atom (sample table atom) 18 in the management file corresponding to a moving image file. It is a figure which shows the atom structure of the sample description atom 311 of the sample table atom 18 in detail. 5 is a diagram illustrating a data structure of encode information 518. FIG. It is a figure which shows the range to which each discrimination | determination information is applied. 10 is a flowchart illustrating a recording process procedure of the video camera 3 according to the third embodiment. 14 is a flowchart illustrating a procedure of reproduction processing of the video camera 3 according to the third embodiment. It is a figure which shows the 1st reproduction | regeneration display example in TV monitor. It is a figure which shows the 2nd reproduction | regeneration display example in TV monitor. It is a figure which shows the 3rd example of a reproduction | regeneration display on a TV monitor. It is a figure which shows the structure of the functional block of the video camera 4 by Embodiment 4. FIG. 14 is a flowchart illustrating a recording process procedure of the video camera 4 according to the fourth embodiment. 6 is a diagram illustrating a data structure of a content management file 270. FIG. It is a figure which shows the example of the list display screen of the content displayed based on the content management file. 6 is a diagram illustrating a relationship between a range 291 of all pixels related to an image sensor 290 and a range 292 of effective pixels. It is a schematic diagram when the movie projected on the screen was image | photographed using the image pick-up element 290. FIG. It is a figure which shows the example of the telecine conversion using a 2-3 pulldown system. It is a figure which shows the structure of the functional block of the conventional recording / reproducing apparatus 320. FIG.

Explanation of symbols

1, 2, 3, 4 Video camera 100 Camera unit 101 Microphone 102 Video stream generation unit 103 Detection unit 104 Discrimination unit 105 Control unit 106 Recording unit 110 Video signal output unit 111 Audio signal output unit 112 Video stream decoding unit 115 Playback control unit 116 playback unit 119 picture number identification unit 130 pickup 131 DVD-RAM disc

Claims (20)

A data processing apparatus for recording a video stream related to video on a recording medium,
A signal acquisition unit for acquiring a video signal related to the video;
A type specifying unit for specifying a video type based on the video signal, wherein the video type is determined according to the number of display pictures per unit time of the video;
A stream generation unit that generates a video stream based on the video signal;
A control unit that determines whether to prohibit recording of the video stream based on the type of the video, or to permit recording of the video stream with reduced video quality;
And a recording unit that controls recording of the video stream on the recording medium based on the determination of the control unit.   The data processing apparatus according to claim 1, wherein the control unit prohibits recording of the video stream when the video type is a movie. An adjustment unit for selecting a video quality based on the video type;
The data processing apparatus according to claim 1, wherein the stream generation unit generates a video stream of the video having the selected video quality. When the video type matches the predefined type,
The control unit permits recording of a video stream having the video quality degraded;
The data processing apparatus according to claim 3, wherein the adjustment unit selects a video quality lower than a preset video quality. When the video type does not match the predefined type,
The control unit permits recording of a video stream maintaining video quality,
The data processing apparatus according to claim 3, wherein the adjustment unit selects the same video quality as a preset video quality.   The data processing apparatus according to claim 3, wherein the adjustment unit selects the video quality with respect to resolution. The type specifying unit is:
A detection unit that continuously receives the video signal and detects whether or not a first image and a second image constituting each picture of the video match;
The data processing apparatus according to claim 1, further comprising: a determination unit that determines a type of the video based on a detection result. The detector is
A first memory for storing data of the first image;
A second memory for storing data of the second image;
The comparison unit according to claim 7, further comprising: a comparison unit that compares data in the first memory with data in the second memory and detects matching / mismatching between the first image and the second image. The data processing apparatus described.   The data processing apparatus according to claim 7, wherein the determination unit continuously receives detection results and specifies the type of the video based on a pattern in which a match and a mismatch appear. A management information generating unit that generates discrimination information indicating whether the video is encoded at a first resolution or a second resolution lower than the first resolution, and manages the information in association with the video stream;
The data processing apparatus according to claim 6, wherein the recording unit further records the discrimination information on the recording medium. The management information generation unit manages a plurality of contents including the set of the discrimination information and the video stream associated with each other,
The data processing apparatus according to claim 10, further comprising a management file generation unit that extracts discrimination information from each of the contents and generates a content management file having an entry for each content. A data processing device that reads a video stream related to video from a recording medium and outputs a video signal,
The video stream and management information are recorded on the recording medium, and the management information is encoded with either the first video quality or the second video quality lower than the first video quality. Discriminating information indicating whether or not
A reading unit for reading the video stream and the management information from the recording medium;
An extraction unit that extracts the discrimination information from the management information and generates quality display data indicating which of the first video quality and the second video quality is based on the discrimination information;
A decoding unit for decoding the video stream to generate a video signal;
An output unit that outputs the quality display data and the video signal in association with each other.   The discrimination information indicates that the video is encoded with the second video quality when the video type matches a predefined type, and when the video type does not match, the video is the first video quality. The data processing apparatus according to claim 12, wherein the data processing apparatus indicates that the data has been encoded with the data. Further comprising a superimposition processor that superimposes the quality display data on the video signal;
The data processing apparatus according to claim 13, wherein the output unit outputs the video signal on which the quality display data is superimposed.   The data processing apparatus according to claim 13, wherein the output unit includes a video signal output unit that outputs the video signal and a display output unit that displays the quality display data. In the recording medium, a plurality of sets of the discrimination information and the set of video streams are associated and stored as content, and each discrimination information is stored in a content management file having an entry for each content,
The extraction unit according to claim 12, wherein the extraction unit extracts each determination information from the content management file, and generates list data for displaying the content corresponding to each entry and the quality display data in association with each other. Data processing device. A data processing method for recording a video stream related to video on a recording medium,
Obtaining a video signal relating to the video;
Identifying a video type based on the video signal, wherein the video type is determined according to the number of pictures displayed per unit time of the video;
Generating a video stream based on the video signal;
Determining whether to prohibit recording of the video stream or recording of a video stream with reduced video quality based on the video type; and
Controlling the recording of the video stream on the recording medium based on the determination.   The data processing method according to claim 17, wherein the controlling step prohibits recording of the video stream when the video type is a movie. Further comprising selecting video quality based on the video type;
The data processing method according to claim 17, wherein generating the video stream generates a video stream of the video having the selected video quality. When the video type matches the predefined type,
The step of determining permits recording of a video stream with reduced video quality;
The data processing method according to claim 19, wherein the selecting step selects a video quality lower than a preset video quality.

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