JP2008060638A - Method and program for compressing video information - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video information compressing method and a video information compressing program for compressing video information and recording the compressed information with small burden due to processing the video information, and without causing deterioration in image quality. <P>SOLUTION: First, an initial I picture 1500 is divided into 16×16 pixel macro blocks, and remainder data for each macroblock are acquired (S11). Then, all the macroblocks are added to a still picture list 150C (S12). Then, a subsequent I picture 1500 is divided into macroblocks, and remainder data of each macroblock are acquired (S13). Then, the remainder data are compared to the remainder data of the macroblock of the still picture list 150C to calculate a difference (S14). Data having a difference exceeding a predetermined threshold are determined as a motion picture region 1501 (Yes in S15), and its macroblock is deleted from the still picture list 150C (S16). After all the I pictures are processed, the processing is completed (S17). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a video information compression method and a video information compression program at the time of recording a digital broadcast, and in particular, a video information compression method and video for compressing and recording video information without causing a reduction in image quality with a small load associated with video information processing. It relates to an information compression program.

  As a conventional technique, there is a storage device capable of executing a video information compression method that can delete video frames at a high compression rate by deleting redundant frames in the video information block (see, for example, Patent Document 1).

The storage device includes a video information compression unit that compresses video information by encoding, a motion vector amount detection unit that extracts and calculates a motion vector amount of the compressed video information, and the detected motion vector amount is a predetermined amount. Frame drop amount determination means for determining at least whether or not to reduce the B picture depending on whether or not the value exceeds the value of B, and detecting the B picture with less motion in the video information by the motion vector amount detection means, It is possible to reduce the storage capacity of the video information by deleting redundant B pictures by the drop amount determination means and rewriting the header information based on the deletion operation.
JP 2004-289876 A

  However, according to the conventional storage device, since at least the motion vector amount detection means and the frame drop amount determination means are required, there is a problem that the configuration of the storage device becomes complicated. Further, the load associated with the processing of video information increases due to the complexity of the configuration. Further, since the originally existing frame is deleted, there is a problem that the image quality is deteriorated.

  Accordingly, it is an object of the present invention to provide a video information compression method and a video information compression program for compressing and recording video information without reducing the load associated with the processing of the video information and without reducing the image quality.

(1) In order to achieve the above object, the present invention provides a detection step for detecting an area without motion from video information, extracts and stores a still image from the video information based on the area, and compresses the area. And a storage step for storing the compressed video information. A video information compression method is provided.

  According to such a method, a selective process based on a region, such as extracting a still image based on a region and compressing video information, is performed. Video information can be compressed without degrading.

(2) Further, in order to achieve the above object, the present invention divides an I picture in video information into a plurality of areas, acquires residual data from the plurality of areas, and creates a still image list. A difference acquisition step of acquiring a difference between the residual data in the still image list and residual data of another I picture, and when the difference is equal to or greater than a predetermined threshold, the region is extracted from the still image list. A determination step of deleting, and extracting and storing a still image based on the region of the still image list, and compressed video information in which the residual data of the region of the still image list of all I pictures is zero There is provided a video information compression method comprising a storage step of storing.

  According to such a method, in addition to the effect of (1), by writing 0 in the residual data and compressing it, the load associated with the decoding process during reproduction can be reduced.

(3) Further, in order to achieve the above object, the present invention provides a computer for detecting a non-motion area from video information and extracting and storing a still image from the video information based on the area. A video information compression program is provided that functions as storage means for storing compressed video information in which the area is compressed.

  According to such a method, a video information compression program having the effect (1) can be realized.

  According to the present invention, it is possible to simply reduce the recording capacity of video information without increasing the load associated with the processing of video information and without causing deterioration in image quality.

  Embodiments of a video information compression method and a video information compression program according to the present invention will be described below in detail with reference to the drawings.

Embodiment
(Configuration of electronic equipment)
FIG. 1 is a perspective view of a PC (personal computer) as an electronic apparatus according to an embodiment of the present invention.

  The PC 1 includes a main body unit 20 and a movable unit 21 and is connected by a hinge unit 211 so as to be freely opened and closed. The main unit 20 includes electronic parts such as a CPU (Central Processing Unit) and an HDD (Hard Disc Drive), and a character input unit 140 for inputting characters and commands, a touch pad 141 as a pointing device, and a decision switch. 142. The movable unit 21 includes a display unit 12 including a display device such as a color liquid crystal display panel that displays characters, images, and the like.

  FIG. 2 is a schematic configuration diagram of a PC according to the embodiment of the present invention.

  The PC 1 includes a memory 10 that temporarily stores information during information processing, a tuner unit 11 that can be tuned by receiving broadcast waves from the outside, a display unit 12 that displays characters and images, and a display unit 12. A display control unit 12A that performs control related to image display, a voice output unit 13 that outputs voice information, and a character input unit 140 and a touch pad 141 shown in FIG. An operation unit 14 including a determination switch 142, a recording unit 15 that stores information in a readable and writable manner, and a control unit 16 that controls and operates each unit of the PC 1.

  The recording unit 15 is a hard disk drive, for example, and holds recording information 150 as recorded video information. The recording information 150 is stored in, for example, MPEG2 (Moving Picture Experts Group phase 2) format, and includes moving image information 150A that is video information, a still image 150B that is displayed over the moving image information 150A, and a still image 150B. It consists of a still image list 150C for extraction.

  The moving image information 150A is composed of a plurality of frames according to the MPEG2 compression method, and each frame includes an I picture that is video information obtained by performing DCT (Discrete Cosine Transform) on the original digital video information, and a forward direction. It consists of a P picture, which is video information by DCT coding with motion compensation, and a B picture by DCT coding with motion compensation using the I picture and the P picture positioned before and after in time as a reference screen. The

  The control unit 16 decodes and displays the digital high-definition broadcast wave received by the tuner unit 11 and displays a TV viewer 160 as a video information compression program that can be recorded by compressing the storage capacity in the recording unit 15 as the recording information 150. It is possible to operate. The TV viewer 160 can also reproduce the recorded information 150. In addition, a plurality of applications may be operable.

  FIG. 3 is a schematic configuration diagram of a TV viewer according to the embodiment of the present invention.

  The TV viewer 160 includes a GUI processing module 161 that performs GUI (Graphical User Interface) processing for displaying an application, an application control processing module 162 that controls a GUI processing module 161 and a stream module processing 163 to be described later, and a video. A stream processing module 163 that performs signal recording processing and decoding.

  The application control processing module 162 divides each I picture of the recording information into a plurality of areas to detect the area of the still image 150B, and the detected still image area as a still image list 150C. And a still image list management unit 162B for management.

  The stream processing module 163 is capable of decoding, and has a signal input 163C that receives a signal, a video processing 163A that processes a video signal, an audio processing 163B that processes an audio signal, and a signal output 163D that outputs a signal. . At the time of decoding, when the signal input 163C receives the video signal from the tuner unit 11 and the recording unit 15, the video processing 163A processes the video component of the video signal, and the audio processing 163B processes the audio component of the video signal. The processed video signal is output to the display unit 12 and the audio output unit 13.

(Operation)
The operation of the PC according to the embodiment of the present invention will be described below with reference to FIGS.

  Each operation is performed in the operation unit 14, and each process is executed in the control unit 16. When processing is executed in the control unit 16, the memory 10 assists the processing by temporarily recording data. The tuner unit 11 receives a digital broadcast wave from the outside, and the received video signal is decoded by the control unit 16 and displayed on the display unit 12 by the display control unit 12A. The audio of the video signal is output from the audio output unit 13. At the time of recording, the video signal of the digital high-definition broadcast is converted into recording information 150 as a compressed video signal in the MPEG2 format, which is the video format, and is recorded in the recording unit 15.

  The TV viewer 160 can be activated based on an input operation of the operation unit 14, and can execute program recording reservation processing and recording. The recording information 150 is created in the recording unit 15.

  FIGS. 4A to 4C are schematic diagrams showing video information related to the embodiment of the present invention.

  As shown in FIG. 4 (a), video information such as digital high-definition broadcasting and terrestrial digital broadcasting has a 4: 3 broadcast format compared to a 16: 9 broadcast format such as horizontal 1440 pixels × vertical 1080 pixels. In order to broadcast a program, when there is no movement in a part thereof, there may be a region such as a still image region 1502, for example. In the case of video information with m frames, there are m I pictures 1500, and a common still picture is drawn in the still picture area 1502 in all I pictures 1500.

  As shown in FIG. 4B, when the video information is recorded as the recording information 150, the TV viewer 160 detects the still image region 1502 by the still image region detection unit 162A, and each I picture 1500 as the moving image information 150A. The video information in which the residual data in the still image area 1502 is replaced with 0 and becomes the 0 data area 1503 is stored. Further, as the still image 150B, an image in which the residual data of the area other than the still image area 1502 is replaced with 0 and the 0 data area 1503 is saved is stored.

  As shown in FIG. 4C, when the recorded information 150 is reproduced, the TV viewer 160 encodes the moving image information 150A in the stream processing module 163 as usual, and then displays the still image 150B superimposed on each frame. Then, the same video information as shown in FIG.

  FIG. 5 is a flowchart showing the operation of the still image area detection unit of the TV viewer according to the embodiment of the present invention.

  First, the first I picture 1500 is divided into 16 × 16 pixel macroblocks to obtain residual data for each macroblock (S11). Next, all macroblocks are added to the still image list 150C (S12).

  Next, the next I picture 1500 is divided into macro blocks, and residual data of each macro block is acquired (S13). Next, the residual data is compared with the residual data of the macroblock of the still image list 150C, and the difference is calculated (S14). If the difference exceeds a predetermined threshold, it is determined that the area is the moving image area 1501. If there is a macroblock whose difference is equal to or greater than the threshold (S15; Yes), the macroblock is deleted from the still image list 150C (S16). If there is no macroblock whose difference is greater than or equal to the threshold (S15; No), the processing is continued without deleting the macroblock.

  The processes related to S13 to S16 are performed on each I picture 1500, and the process ends when all the I pictures have been processed (S17).

  FIG. 6 is a flowchart showing an operation of storing the TV viewer recording information 150 according to the embodiment of the present invention.

  First, all macroblocks are extracted from the still image list 150C acquired by the operation of FIG. 5 (S21). Next, the still image 150B is acquired and recorded based on the extracted macroblock (S22). Next, the residual data corresponding to the extracted macroblock of each I picture is rewritten to 0 and recorded as moving image information 150A, and recording information 150 as compressed video information is recorded (S23).

  FIG. 7 is a flowchart showing the recording information reproducing operation according to the embodiment of the present invention.

  First, the moving image information 150A of the recording information 150 is decoded as usual (S31). Next, the still image 150B is displayed superimposed on the decoded video information (S32).

(Effect of embodiment)
According to the embodiment of the present invention described above, 0 data that does not need to be decoded is written to the still image area 1502, and the still image 150B is separately stored, so that the recording capacity of the recording information 150 is compressed without deterioration in quality. Can be saved.

  In addition, since complicated video processing is not performed, the load associated with the processing can be reduced, and stable video processing can be performed. Further, the storage capacity can be compressed by determining and selectively processing the moving image area 1501 and the still image area 1502.

  It should be noted that the video format to be compressed is not limited to MPEG2 as long as it can determine still images and moving images, and is a digital video signal.

  In this embodiment, an area where the video does not change is determined as the still image area 1502 in the entire recording information 150, but an area that does not change at a certain period is determined as the still image area 1502. A logo or the like in the program corner can be saved as a still image 150B. Further, by providing a certain period, it is possible to cope with a change in the still image area 1502 due to a CM or the like having a format different from that in the program.

It is a perspective view of PC as an electronic device regarding embodiment of this invention. It is a schematic block diagram of PC regarding embodiment of this invention. It is a schematic block diagram of TV viewer regarding embodiment of this invention. (A)-(c) is the schematic showing the video information regarding embodiment of this invention. It is a flowchart which shows operation | movement of the still image area | region detection part of TV viewer regarding embodiment of this invention. It is a flowchart which shows the preservation | save operation | movement of the recording information 150 of TV viewer regarding embodiment of this invention. It is a flowchart which shows the reproduction | regeneration operation | movement of the recording information regarding embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... PC (personal computer), 10 ... Memory, 11 ... Tuner part, 12A ... Display control part, 12 ... Display part, 13 ... Audio | voice output part, 14 ... Operation part, 15 ... Recording part, 16 ... Control part, 20 ... Main body part 21 ... Moving part 140 ... Character input part 141 ... Touch pad 142 ... Decision switch 150 ... Recording information 150A ... Movie information 150B ... Still image 150C ... Still picture list 160 ... TV viewer 161 ... GUI processing, 162 ... Application control processing, 162A ... Still image area detection unit, 162B ... Still image list management unit, 163 ... Stream processing, 163A ... Video processing, 163B ... Audio processing, 163C ... Signal input, 163D ... Signal output, 211 ... Hinge part, 1500 ... I picture, 1501 ... Movie area, 1502 ... Still picture area, 1503 ... Over data area

Claims (6)

A detection step for detecting a region without motion from the video information;
A video information compression method comprising: extracting and storing a still image from the video information based on the region, and storing compressed video information obtained by compressing the region.   The video information compression method according to claim 1, wherein the storing step stores the compressed video information compressed by writing 0 as residual data of the area.   The said storage step stores the compressed video information by designating a playback format so that the still image is pasted and played back when the compressed video information is played back. Video information compression method. A list creation step of dividing an I picture in video information into a plurality of areas, obtaining residual data from the plurality of areas, and creating a still image list;
A difference acquisition step of acquiring a difference between the residual data in the still image list and residual data of another I picture;
A determination step of deleting the region from the still image list when the difference is equal to or greater than a predetermined threshold;
A step of extracting and storing a still image based on the region of the still image list, and storing the extracted still image as compressed video information with zero residual data for the region of the still image list of all I pictures; A video information compression method comprising:   5. The storage device according to claim 4, wherein the storing step stores the compressed video information by specifying a playback format so that the still image is pasted and played when the compressed video information is played back. 6. Video information compression method. Computer
Detection means for detecting an area without motion from video information;
A video information compression program that extracts and stores a still image based on the area from the video information and functions as a storage unit that stores compressed video information obtained by compressing the area.