JP2001103419A - Signal processor, video signal recording and reproducing device, signal processing system, signal processing method and storage medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video signal recording and reproducing device, that realizes high-speed consecutive recording by adopting a configuration capable of efficient capturing and reading a still image. SOLUTION: A write means 105 extracts an image signal for a plurality of images at a 1st interval from a received image (still image) that is compression-coded and writes the image to a storage means 107. A read means 108 selectively reads an image signal of an optional image from the image signals for a plurality of the images at a 2nd interval. A setting means 109 sets 1st and 2nd intervals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in, for example, a video signal recording / reproducing apparatus for recording and reproducing moving pictures and still pictures, and in particular, a signal processing apparatus used in a still picture recording apparatus or system. The present invention relates to a video signal recording / reproducing apparatus, a signal processing system, a signal processing method, and a storage medium in which a computer stores processing steps for executing the method.

[0002]

2. Description of the Related Art In recent years, for example, the density of digital signal recording and the density of semiconductors have been increasing, and accordingly, "HD DIGITAL VCR CONFIGURE" has been developed.
A recording format using an image compression technique is standardized, such as an SD format defined by a home digital VCR standard defined by NGE, and a video signal recording such as a camera-integrated VTR using the same is used. Reproduction devices have been commercialized. Many of such video signal recording / reproducing devices support recording of still images in addition to moving images.

[0003]

However, in a conventional video signal recording / reproducing apparatus such as a camera-integrated VTR as described above, in the case of recording a still image, the recording of an image of a certain frame for a certain period of time is completed. Since the image of the next frame cannot be captured, there is a problem that high-speed continuous shooting cannot be performed.

Therefore, the present invention has been made to eliminate the above-mentioned drawbacks, and has a configuration in which a still image is efficiently taken in and read out, thereby realizing a signal capable of realizing high-speed continuous recording. It is an object of the present invention to provide a storage medium in which a processing device, a video signal recording / reproducing device, a signal processing system, a signal processing method, and processing steps for executing the same are stored in a computer readable manner.

[0005]

For such a purpose,
A first invention is a storage means capable of storing image signals of a plurality of screens, a writing means for extracting image signals of a plurality of screens at a first interval from an input image signal and writing the image signals in the storage means, Reading means for selectively reading an image signal of an arbitrary screen from the image signals of a plurality of screens stored in the means at a second interval, and setting means for setting the first interval and the second interval. It is characterized by having.

According to a second aspect, in the first aspect,
The reading means repeatedly reads the image signal of the arbitrary screen from the storage means according to the second interval.

[0007] A third invention is the above-mentioned first invention, wherein:
The reading means selectively reads an arbitrary screen from the image signals of the plurality of screens in the order extracted by the writing means.

[0008] In a fourth aspect based on the first aspect,
Recording means for recording the image signal read from the storage means on a recording medium.

In a fifth aspect based on the first aspect,
A moving image recording mode and a still image recording mode, wherein the writing unit writes all the screens in the storage unit in the moving image recording mode, and the fourth unit is set by the setting unit in the still image recording mode. It is characterized in that image signals of a plurality of screens are extracted at one interval and written in the storage means.

In a sixth aspect based on the first aspect,
A moving image recording mode and a still image recording mode, wherein in the moving image recording mode, the reading means reads out image signals of a plurality of screens written in the storage means at predetermined intervals for each screen, and In the recording mode, an image signal of an arbitrary screen is selectively read at the second interval set by the setting means.

According to a seventh aspect of the present invention, in the fourth aspect,
The recording means records the additional information relating to the image signal together with the image signal on the recording medium.

According to an eighth invention, in the above-mentioned seventh invention,
The additional information includes identification information indicating that the image signal is a signal related to a continuous series of images.

According to a ninth aspect, in the first aspect,
The image processing apparatus further includes an imaging unit that outputs a signal obtained by imaging the subject as the input image signal.

A tenth invention is characterized in that, in the first invention, there is provided a display means for displaying an image relating to the image signal read by the reading means.

In an eleventh aspect based on the first aspect, there is provided an encoding means for encoding the input image signal,
The storage means stores the encoded image signal.

A twelfth invention provides a video signal having a function of encoding an input image signal and recording the same on a recording medium, and a function of reproducing and outputting the encoded image signal recorded on the recording medium. A recording / reproducing apparatus, comprising: a storage unit capable of storing image signals of a plurality of screens after encoding, and extracting image signals of a plurality of screens from an input image signal after encoding and writing the extracted image signals to the storage unit. Setting means for setting a first interval and a second interval for selectively reading out an image signal of an arbitrary screen from among the image signals of a plurality of screens stored in the storage means; and Display means for displaying an image relating to the image signal read from the storage means at intervals; and image data read from the storage means at the second interval to the recording medium. Characterized in that it comprises a recording means for recording.

In a thirteenth aspect based on the twelfth aspect, the recording means, when recording the image signal, adds, to the image signal, additional information indicating at least a continuous image sequence. It is characterized by being added.

A fourteenth invention is a signal processing system in which a plurality of devices are communicably connected, wherein at least one of the plurality of devices is one of the first to eleventh embodiments. It has a function of a signal processing device or a function of a video signal recording / reproducing device according to claim 12 or 13.

A fifteenth aspect of the present invention is a signal processing method for encoding an input image signal obtained by imaging and recording the encoded image signal on a recording medium, wherein the encoded image signal on a plurality of screens can be stored. A writing step of writing image signals of a plurality of screens in the input image signal after encoding into the memory at a first interval, and reading out image signals of a plurality of screens stored in the memory at a second interval The reading step and the first interval so that an image signal of an arbitrary screen is selectively read from the image signals of a plurality of screens stored in the memory when the image signal is read in the reading step. And a control step of controlling the second interval.

In a sixteenth aspect based on the fifteenth aspect, in the memory, the memory for temporarily storing the coded image signal is expanded to have a capacity capable of storing the coded image signals of a plurality of screens. It is characterized by having a configuration.

In a seventeenth aspect based on the fifteenth aspect, the control step controls the first interval and the second interval so that image signals of the arbitrary screen are read out for a plurality of screens. It is characterized by including a step.

According to an eighteenth aspect, in the fifteenth aspect, a display step of displaying, on a display, an image relating to the image signal read from the memory at the second interval in the reading step is provided. It is characterized by.

A nineteenth invention is characterized in that, in the fifteenth invention, a recording step of recording the image signal read from the memory at the second interval in the reading step on the recording medium is provided. And

In a twentieth aspect based on the nineteenth aspect, the recording step includes a step of recording additional information on the image signal together with the image signal on the recording medium.

According to a twenty-first aspect, in the twentieth aspect, the additional information includes identification information indicating that the image information is a signal of a continuous series of images.

In a twenty-second aspect based on the fifteenth aspect, the encoded image signal includes an encoded still image signal.

According to a twenty-third aspect, in the nineteenth aspect, a reproducing step of reproducing the recording signal from the recording medium on which the image signal has been recorded in the recording step is provided.

According to a twenty-fourth aspect of the present invention, there is provided a signal processing apparatus according to any one of the first to eleventh aspects, a video signal recording and reproducing apparatus according to the twelfth or thirteenth aspect, and a means provided in the signal processing system according to the fourteenth aspect. Is a storage medium in which a computer stores a processing program for executing the program.

According to a twenty-fifth aspect of the present invention, a computer-readable storage medium stores the processing steps of the signal processing method according to any one of claims 15 to 23.

More specifically, for example, a memory for temporarily storing a compression-encoded image signal is expanded to a capacity capable of storing a plurality of frames of compression-encoded image signals, and an expanded area (extended area) of the memory is expanded. Means for controlling (setting) a first interval for loading image signals into the extended memory and a second interval for reading image signals of a plurality of frames loaded into the extended memory. Means for displaying the image signal at the second interval in addition to the means for selectively displaying the image signal on a frame-by-frame basis, and selectively recording the image fetched into the extended memory on a frame-by-frame basis. If a means for recording an image at the second interval is provided in addition to the means for performing the moving image processing, an arbitrary image may be provided if the processing rate of the moving image is lower than the processing rate. With continuous shooting becomes possible interval, favorite recording interval (second interval)
Can be selected immediately, and more effective shooting and recording can be performed without significantly increasing the memory capacity. In addition, by adopting a configuration in which identification information indicating that the images are a series of consecutively shot images is added and recorded, it is possible to collectively capture a series of images when the images are captured by a personal computer or the like. This makes it possible to capture still images comfortably.

[0031]

Embodiments of the present invention will be described below with reference to the drawings.

The present invention is applied to, for example, a camera-integrated VTR 100 as shown in FIG.

The camera-integrated VTR 100 complies with the SD standard. As shown in FIG. 1, an image pickup circuit 101 having an image pickup element (here, a CCD) and an object light are projected onto the CCD of the image pickup circuit 101. Optical system 110 that guides
A video processing circuit 102 that performs predetermined signal processing on an output signal of the imaging circuit 101; and a frame memory circuit 103 in which a signal and the like after the processing in the video processing circuit 102 are written.
A compression processing circuit 104 for performing compression processing on an output signal of the frame memory circuit 103; a track memory circuit 106 in which compressed data and the like obtained by the compression processing circuit 104 are written in a track image;
Recording / reproduction for performing processing such as error correction and modulation in accordance with the SD standard recording format on the compressed data written in 06, and performing processing such as demodulation and error correction for the compressed data reproduced from the magnetic tape 113. Circuit 11
1, a magnetic head 112 for recording the compressed data processed by the recording / reproducing circuit 111 on the magnetic tape 113 or reproducing the compressed data from the magnetic tape 113, and a compressed data written to the track memory circuit 106. S
And a digital interface circuit 114 for performing digital interface processing determined by the D standard.
3 is also written via the recording / reproducing circuit 111.

The camera-integrated VTR 100 expands the output of the track memory circuit 106 (compressed data reproduced from the magnetic tape 113 or compressed data for recording on the magnetic tape 113) by an expansion processing circuit 117.
The frame memory circuit 103 is also configured to write the data after the decompression processing in the decompression processing circuit 117.

Here, the camera-integrated V in the present embodiment
The TR 100 further extracts a plurality of frames at a first interval (first time interval, hereinafter referred to as “capture interval”) from the compressed image data output from the compression processing circuit 104, and Memory circuit 1
And a capture interval control circuit 105 for capturing the image data of a plurality of frames captured by the track memory circuits 106 and 107 at a second interval (a second time interval, hereinafter referred to as a “recording interval”). ) To the recording / reproducing circuit 111, a control circuit 110 for controlling the capture interval in the capture interval control circuit 105 and the recording interval in the recording interval control circuit 108, A switch 116 for switching between compressed data reproduced from the tape 113 and compressed data (image confirmation data) for recording on the magnetic tape 113 and supplying the same to the decompression processing circuit 117, and a track memory circuit for capturing still images An extended memory circuit 107 extended with respect to It is provided.

The capture interval control circuit 105 controls the capture interval of the compressed data obtained by the compression processing circuit 104. Therefore, the track memory circuit 10
In 6, the compressed data obtained by the compression processing circuit 104 is temporarily stored by the capture interval control circuit 105 at the capture interval.

The recording interval control circuit 108 controls a recording interval for recording and confirming a captured image. Therefore, the recording / reproducing circuit 111 and the switch 1
To 16, the compressed data written in the track memory circuit 106 is supplied by the recording interval control circuit 108 at recording intervals.

The control circuit 110 controls the operations of the capture interval control circuit 105 and the recording interval control circuit 108 based on the capture and recording intervals set by the operation unit 109, respectively.

The above-described camera-integrated VTR 100
Operates as follows during normal moving image recording, still image recording, and playback.

[Operation at the time of recording a moving image] In the operation at the time of normal moving image recording, the capture interval control circuit 105 and the recording interval control circuit 108 each receive a moving image recording instruction from the operation unit 109. Under the control, an operation of outputting all screens of the input image data is performed.

First, light from a subject (not shown) is transmitted through an optical system 120 to an image pickup device (CC
D) The image is formed on the image, converted into an electric signal, and input to the video processing circuit 102.

The video processing circuit 102 digitizes a signal (video signal) from the imaging circuit 101 and outputs the digitized video signal to the imaging device (C
A matrix signal (not shown) corresponding to the color filter array of CD) separates the signal into a luminance signal and a color difference signal. The luminance signal and the color difference signal obtained by the video processing circuit 202 are represented by S
The data is written to the frame memory circuit 103 in accordance with the sampling conforming to the D standard.

The luminance signal and the chrominance signal (hereinafter, referred to as "baseband image signal") written in the frame memory circuit 103.
Or simply "image signal") according to the SD standard,
The data is shuffled and read out to the compression processing circuit 104. The compression processing circuit 104 includes the frame memory circuit 1
03 is applied to the discrete cosine transform (DC
Compression processing such as T-transformation, quantization, and Huffman coding. The image signal subjected to the compression processing by the compression processing circuit 104 is subjected to teleshuffling, and is written to the track memory circuit 106 via the capture interval control circuit 105. At this point, the compressed image signal written in the track memory circuit 106 (hereinafter, referred to as “compressed data”)
Is data obtained by compressing the original image signal before compression by about 1/5.

The compressed data written in the track memory circuit 106 is read out in the recording order via the recording interval control circuit 108 and sent to the recording / reproducing circuit 111. The recording / reproducing circuit 111 performs processing such as error correction encoding and modulation on the compressed data from the recording interval control circuit 108 according to a predetermined recording format.
The compressed data after the processing is recorded on the magnetic tape 113 via the magnetic head 112.

The compressed data written in the track memory circuit 106 is transmitted to the digital interface circuit 1
14 is also read. The digital interface circuit 114 processes the compressed data from the track memory circuit 106 in accordance with the digital interface standard defined by the SD standard, and outputs the processed compressed data from the digital interface terminal 115.

[Operation at Still Image Recording] Here, the operation at the time of continuous shooting recording of a still image will be described. During continuous shooting and recording of a still image, two-stage operations of capturing and recording an image signal are performed by the user operating the following buttons on the operation unit 109.

First, the operation unit 1 is
From 09, an image capture interval control signal and a recording interval control signal are supplied. These interval control signals are signals indicating the value of the image capture interval or the recording interval, the number of recordings, and the like. Here, for the sake of simplicity, the target signal is assumed to be an interlaced signal of the NTSC system, and the user sets the image capture interval to 1/15 second, the recording interval to 1/10 second, and the number of recordings to three. , An image capture interval control signal and a recording interval control signal indicating these,
It shall be supplied to 0.

Therefore, the control circuit 110 operates the operation unit 1
09 and the recording interval control circuit 1 based on the above-described image capturing interval control signal and recording interval control signal.
08 are respectively controlled.

Then, when an image capture button (not shown) of the operation unit 109 is pressed, at that timing,
An image signal is taken into the frame memory circuit 103. This image signal is generated by subjecting the subject light via the optical system 120 to the imaging circuit 10 in the same manner as in the above-described moving image recording.
1 is converted into an electric signal by the video processing circuit 10
2 is the signal processed in FIG.

The image signal captured by the frame memory circuit 103 is subjected to a compression process by a compression processing circuit 104, and is written to an extended memory circuit 107 of a track memory circuit 106 via a capture interval control circuit 105.

At this time, the capture interval control circuit 10
5 is controlled according to an image capture interval control signal from the control circuit 110, and is output from the compression processing circuit 104 (compressed data), specifically, every 1/15 second from data processed at 30 frames / second, that is, 3 per frame
The image data for the frame is extracted, and the extended memory circuit 10
Write to 7.

The compressed data written in the extension memory circuit 107 is supplied to the changeover switch 116 via the recording interval control circuit 108.

At this time, the recording interval control circuit 10
Reference numeral 8 denotes a control unit that selects compressed data of an image of three frames so that one image is updated every 1/10 second, reads out the image repeatedly, and sends it to the switch 116 so that one image is updated every 1/10 second. And supply.

As described above, the extension memory circuit 107
The compressed data read out from the storage via the recording interval control circuit 108 is supplied to the decompression processing circuit 117 by the changeover switch 116.

The decompression processing circuit 117 includes the changeover switch 11
6 is decompressed and written to the frame memory 103 as a baseband image signal. The image signal written in the frame memory 103 is read out to the video signal processing circuit 102 and output from the video output terminal 118. Thus, the captured image is confirmed by the display panel 130 connected to the video output terminal 118.

FIGS. 2A to 2C show operation timings of the capture interval control circuit 105.
FIGS. 3A to 3C show the recording interval control circuit 10.
8 shows the operation timing.

First, in FIG. 2A, "
, "N + 1", "N + 2",... Indicate a cycle every 1/30 seconds. In FIG. 3B, "frame 1", "frame 2",. The compressed data input to the interval control circuit 105 is numbered in a time series on a frame basis. In FIG. 3C, "address 1", "address 2",. 10 shows an address of each frame 107.

As shown in FIGS. 2A to 2C, "
When the image capture button is pressed at the time of “N”, “
The compressed data of the image of frame 1 ", frame 3", and frame 5 "is written into" address 1 "," address 2 ", and" address 3 "of the extended memory circuit 107 in frame units, and" frame 2 ". , “Frame 4” and “frame 6” become invalid.

On the other hand, in FIG.
, "N + 6", "N + 7",... Indicate a cycle every 1/30 seconds. In FIG. 3B, "address 1", "address 1",. Circuit 1
In FIG. 10C, “frame 1”, “frame 1”,... Indicate the extended memory circuit 1 by the recording interval control circuit 105.
The compressed data read from 07 is shown in association with FIG.

When the image capture is completed at the timings shown in FIGS. 2A to 2C, as shown in FIGS. 3A to 3C for confirmation of the captured image. At the timing, the recording interval control circuit 106 reads compressed data from the extended memory circuit 107. In particular, as shown in FIG. 3C, three captured images (here, “frame 1”, “frame 3”, “frame 3”)
The image of frame 5 ″ is read out three frames each from the extended memory circuit 107. The read image is supplied to the decompression processing circuit 117 by the changeover switch 116, decompressed, and then written into the frame memory 103. The video signal is then processed by the video signal processing circuit 102 and output from the video output terminal 118 to which the display panel 130 is connected. Are repeatedly displayed three frames each.

While the above operation is being performed, the captured image and the recording interval are checked.
When the image capture button is pressed again, the operation at the timings shown in FIGS. 2A to 2C is repeated. At this time, when the recording interval is changed, the display panel 1 connected to the video output terminal 118 is controlled by the recording interval control circuit 108.
The image display interval at 30 will change.

Thereafter, when the record button is pressed, the compressed data of the image taken into the extended memory circuit 107 is
At the timings shown in FIGS. 3A to 3C, the recording interval control circuit 108 controls the recording / reproducing circuit 111.
Is read.

Thereafter, in the same manner as in the case of moving image recording described above, the compressed data read to the recording / reproducing circuit 111 is processed by the recording / reproducing circuit 111 and then processed by the magnetic head 1.
12 is recorded on a magnetic tape 113.

At this time, the recording / reproducing circuit 111 includes, together with the compressed data, identification information indicating that the compressed data is a continuous shot image (a series of continuous images), information on the number of images in the continuous shot, Information indicating the number of the image in the copy is generated and recorded on the magnetic tape 113 together with the image data. The above-described various information to be recorded together with the compressed data is recorded in a user area such as an optional pack of an SD standard serve code.

[Operation During Reproduction]

First, the compressed data reproduced from the magnetic tape 113 by the magnetic head 112
1 is supplied. The recording / reproducing circuit 111 includes the magnetic head 1
Processing such as demodulation and error correction is performed on the compressed data from No. 12. The compressed data processed by the recording / reproducing circuit 111 is written to the track memory circuit 106.

The compressed data written in the track memory circuit 106 is read out by the shuffling processing circuit 117 via the changeover switch 116 to the decompression processing circuit 117. The decompression processing circuit 117 applies Huffman decoding, inverse quantization, inverse DC
A decompression process such as T is performed. The data after the expansion processing in the expansion processing circuit 117 is shuffled and written as a baseband image signal in the frame memory circuit 103.

The image signal written in the frame memory circuit 103 is read out by the video signal processing circuit 102 and output from the video output terminal 118 as a video signal.

The image signal written in the track memory circuit 106 is transmitted to the digital interface circuit 11
4 is also read. The digital interface circuit 114 processes the image signal from the track memory circuit 106 in accordance with the digital interface standard defined by the SD standard, and outputs the processed data from the digital interface terminal 115.

Here, the digital interface terminal 1
As described above, the data output from No. 15 includes identification information indicating that the data is a continuous shot image (a series of continuous images), information on the number of images in the continuous shot, and information on a series of continuous shots. Information indicating whether the image is the first image or the like is added.

Therefore, as shown in FIG. 4, the device 200 such as a personal computer connected to the digital interface terminal 115 performs a series of continuous shootings by the above various information added to the data from the digital interface terminal 115. , Etc. can be taken in at once.

As described above, in the present embodiment, the track memory circuit 10 for temporarily storing an image (compressed data) is used.
6 is expanded to a capacity capable of storing a plurality of frames of images by the extended memory circuit 107, an image capture interval in the capture interval control circuit 105 for capturing images into the extended memory circuit 107, and an image read out from the extended memory circuit 107. The recording interval in the recording interval control circuit 108 is set by the operation unit 109, and the image read out at the recording interval by the recording interval control circuit 108 is displayed in frame units on the display panel 130 for confirming the captured image. 3 (selecting the images of “frame 1”, “frame 3”, and “frame 5” at the operation timings in FIGS. 3A to 3C). Image read at recording interval by recording interval control circuit 108 Since it is configured to selectively display, if the processing rate is lower than the processing rate during movie recording, high-speed continuous shooting can be performed at any interval, and the desired recording interval can be selected immediately, which is more effective This makes it possible to perform effective photographing and recording without significantly increasing the memory capacity.

Further, since a configuration is adopted in which identification information and the like indicating a series of continuously shot images are added and recorded, for example, when the images are captured by a personal computer or the like, the series of images are batched. It is possible to capture still images comfortably.

In the present embodiment, the present invention is applied to the camera-integrated VTR 100 that handles NTSC interlaced signals. However, the present invention is not limited to this. For example, an image sensor (eg, a progressive image sensor with a high frame rate) may be used. The present invention is also applicable to an apparatus or a system equipped with a CCD or the like.

Further, an object of the present invention is to supply a storage medium storing program codes of software for realizing the functions of the host and the terminal of the above-described embodiment to a system or an apparatus, and to provide a computer (a computer) of the system or the apparatus. It is needless to say that the present invention can also be achieved by a CPU or an MPU) reading and executing a program code stored in a storage medium. In this case, the program code itself read from the storage medium implements the functions of the present embodiment, and the storage medium storing the program code constitutes the present invention. ROM, as a storage medium for supplying the program code,
Floppy disk, hard disk, optical disk, magneto-optical disk, CD-ROM, CD-R, magnetic tape,
A non-volatile memory card or the like can be used. By executing the program code read out by the computer, not only the functions of the present embodiment are realized, but also the OS and the like running on the computer perform actual processing based on the instructions of the program code. It goes without saying that a part or all of the above is performed, and the processing realizes the function of the present embodiment. Further, after the program code read from the storage medium is written to a memory provided in an extension function board inserted into the computer or a function extension unit connected to the computer, the function extension is performed based on the instruction of the program code. It goes without saying that a CPU or the like provided in the board or the function expansion unit performs part or all of the actual processing, and the processing realizes the functions of the present embodiment.

[0076]

As described above, according to the present invention, in particular, a first interval (acquisition interval) for extracting image signals of a plurality of screens from an input image signal and writing the image signals to a memory, And a second interval (recording interval) for selectively reading an image signal of an arbitrary screen from among the image signals of a plurality of screens.
In addition to normal moving images, still images and high-speed continuous recording of still images can be realized with a simple configuration without significantly increasing the memory capacity, and the recording interval (second interval) can be set freely, Effective continuous recording is enabled. In addition, by recording additional information and the like regarding continuous shooting, operability when capturing and editing an image using a personal computer or the like can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining the configuration of a camera-integrated VTR to which the present invention has been applied.

FIG. 2 is a diagram for explaining the operation timing of a capture interval control circuit of the camera-integrated VTR.

FIG. 3 is a diagram for explaining an operation timing of a recording interval control circuit of the camera-integrated VTR.

FIG. 4 is a diagram for explaining image capture when a device such as a personal computer is connected to the camera-integrated VTR.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 VTR integrated with camera 101 Imaging circuit 102 Video signal processing circuit 103 Frame memory circuit 104 Compression processing circuit 105 Capture interval control circuit 106 Track memory circuit 107 Extended memory circuit 108 Recording interval control circuit 109 Operation unit 110 Control circuit 111 Recording / reproduction circuit 112 Magnetic head 113 Magnetic tape 114 Digital interface circuit 115 Digital interface terminal 116 Changeover switch 117 Decompression circuit 118 Video signal output terminal 120 Optical system 130 Display panel

Continued on front page F-term (reference) 5C018 AB01 AC03 DA03 DB01 DC06 JA02 JC01 5C052 AA02 AA17 AC02 CC06 CC11 DD04 GA02 GB06 GB09 GC01 GC05 GD01 GE04 GF05 5C053 FA09 FA21 FA27 GA11 GB06 GB21 HA33 JA24 KA03 KA21 KA24 LA06

Claims (25)

[Claims] 1. A storage means capable of storing image signals of a plurality of screens, a writing means for extracting image signals of a plurality of screens from an input image signal at a first interval and writing the image signals in the storage means, and the storage means Reading means for selectively reading an image signal of an arbitrary screen from the image signals of a plurality of screens stored in the memory at a second interval, and setting means for setting the first interval and the second interval. A signal processing device characterized by the above-mentioned. 2. The signal processing apparatus according to claim 1, wherein said reading means repeatedly reads the image signal of said arbitrary screen from said storage means in accordance with said second interval. 3. The signal processing apparatus according to claim 1, wherein said reading means selectively reads an arbitrary screen from the image signals of said plurality of screens in the order of extraction by said writing means. 4. The signal processing apparatus according to claim 1, further comprising recording means for recording an image signal read from said storage means on a recording medium. 5. A moving image recording mode and a still image recording mode, wherein said writing means writes all screens in said storage means in said moving image recording mode, and said setting means in said still image recording mode. 2. The signal processing apparatus according to claim 1, wherein image signals of a plurality of screens are extracted at a first interval set by the following and written into the storage unit. 6. A moving image recording mode and a still image recording mode, wherein the reading means reads out image signals of a plurality of screens written in the storage means at predetermined intervals for each screen in the moving image recording mode. 2. The signal processing device according to claim 1, wherein in the still image recording mode, an image signal of an arbitrary screen is selectively read at a second interval set by the setting unit. 7. The signal processing apparatus according to claim 4, wherein said recording means records the additional information on the image signal together with the image signal on the recording medium. 8. The signal processing apparatus according to claim 7, wherein the additional information includes identification information indicating that the image signal is a signal relating to a continuous series of images. 9. The signal processing apparatus according to claim 1, further comprising an imaging unit that outputs a signal obtained by imaging the subject as the input image signal. 10. The signal processing apparatus according to claim 1, further comprising display means for displaying an image related to the image signal read by said reading means. 11. The signal processing apparatus according to claim 1, further comprising an encoding unit that encodes the input image signal, wherein the storage unit stores the encoded image signal. 12. A video signal recording and reproducing apparatus having a function of encoding an input image signal and recording the encoded image signal on a recording medium, and a function of reproducing and outputting an encoded image signal recorded on the recording medium. A storage unit capable of storing image signals of a plurality of screens after the encoding, and a first unit for extracting image signals of a plurality of screens from the input image signal after the encoding and writing the image signals to the storage unit. Setting means for setting an interval and a second interval for selectively reading an image signal of an arbitrary screen from among the image signals of a plurality of screens stored in the storage means; Display means for displaying an image relating to the image signal read from the means, and recording the image signal read from the storage means at the second interval on the recording medium. Video signal recording and reproducing apparatus characterized by comprising a means. 13. The recording means according to claim 12, wherein said recording means adds, when recording said image signal, additional information indicating at least a continuous image sequence to said image signal. Video signal recording and playback device. 14. A signal processing system in which a plurality of devices are communicably connected, wherein at least one of the plurality of devices is the signal processing device according to any one of claims 1 to 11. A signal processing system having a function or the function of the video signal recording / reproducing device according to claim 12. 15. A signal processing method for encoding an input image signal obtained by imaging and recording the encoded image signal on a recording medium, wherein the encoded image signal is stored in a memory capable of storing the encoded image signals of a plurality of screens. A writing step of writing the image signals of a plurality of screens in the encoded input image signal at a first interval, a reading step of reading the image signals of a plurality of screens stored in the memory at a second interval, When the image signal is read in the reading step, the first interval and the second interval are selected such that an image signal of an arbitrary screen is selectively read from the image signals of a plurality of screens stored in the memory. A signal processing method including a control step of controlling an interval. 16. The memory according to claim 15, wherein the memory for temporarily storing the coded image signal is expanded to a capacity capable of storing the coded image signals of a plurality of screens. The signal processing method as described. 17. The control step according to claim 1, wherein the first image signal is read for a plurality of screens.
16. The signal processing method according to claim 15, further comprising the step of controlling the first interval and the second interval. 18. The signal processing according to claim 15, further comprising a display step of displaying, on a display, an image related to the image signal read from the memory at the second interval in the reading step. Method. 19. The signal processing method according to claim 15, further comprising a recording step of recording the image signal read from the memory at the second interval in the reading step on the recording medium. 20. The signal processing method according to claim 19, wherein said recording step includes a step of recording additional information on the image signal together with the image signal on the recording medium. 21. The signal processing method according to claim 20, wherein the additional information includes identification information indicating that the image information is a signal of a continuous series of images. 22. The signal processing method according to claim 15, wherein said coded image signal includes a coded still image signal. 23. The signal processing method according to claim 19, further comprising a reproducing step of reproducing the recording signal from the recording medium on which the image signal has been recorded by the recording step. 24. A signal processing device according to any one of claims 1 to 11, or a video signal recording / reproducing device according to claim 12 or 13, for implementing means provided in the signal processing system according to claim 14. A computer-readable storage medium storing the processing program according to the above. 25. A storage medium, wherein the processing steps of the signal processing method according to claim 15 are stored in a computer-readable manner.