JP3541910B2 - Video signal processing device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a video signal processing device that performs display, recording, transmission, or editing when a video signal is supplied.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in order to efficiently record or transmit a video signal, a technique for encoding a video signal with high efficiency has been important. In order to know the contents of the above-described highly efficient coded video signal, a method of decoding and displaying the video signal is generally used.
[0003]
By the way, there is a strong demand to know the contents of the coded video signal, particularly the video signal recorded on the magnetic tape, more quickly.
[0004]
High-speed reproduction is an example of a means for more quickly knowing the content of an encoded video signal recorded on a magnetic tape. The high-speed reproduction is a method in which the tape running speed is increased, and video data over a plurality of frames is decoded as video data of one frame. As a document describing this method, there is, for example, JP-A-4-86183.
[0005]
Another example of quickly and easily knowing the content of a recorded video signal is a method of extracting and displaying only a representative video signal. For example, according to the contents disclosed in JP-A-7-123355, in addition to data for normal reproduction, a DC component obtained by performing discrete cosine transform (DCT) on each block for high-speed reproduction is separately recorded. Then, there is shown a method of enlarging, filtering and displaying this.
[0006]
However, according to the contents disclosed in Japanese Patent Application Laid-Open No. 4-86183, it is possible to quickly know the recorded contents, but it is necessary to decode the data for high-speed reproduction, and it is obtained by performing high-speed reproduction. Since a video signal extends over a plurality of frames, it is impossible to edit the video signal in frame units.
[0007]
In the content disclosed in JP-A-7-123355, data having the same content is recorded twice in order to separately store the DC component of each block for high-speed (simple) reproduction in addition to the data for normal reproduction. This means that more recording area is required.
[0008]
Next, when transmitting a video signal, if an image of an arbitrary frame in a moving image is transmitted as one image data, it is not always necessary to transmit all data in real time. Can be sufficiently transmitted even if a transmission path whose transmission is not sufficiently large is used. However, when transmitting a moving image, it is necessary to use a very limited high-speed line such as a satellite communication even if high-efficiency coding is performed.
[0009]
Conventionally, as a method of editing a video signal, tape-to-tape editing using a VTR (video tape recorder) has been widely used. Also, in order to increase the efficiency of use of expensive broadcast VTRs, materials are temporarily dubbed onto inexpensive tapes to create working tapes, editing rehearsals are made on the working tapes, and the final decision list is used. Offline editing methods such as main editing are also frequently used. In tape-to-tape editing (linear editing), it took a huge amount of time to access necessary cuts and change the editing content. However, due to the recent development of computer technology and magnetic disk technology, recording has been An editing device that once captures a material on a tape onto a hard disk and performs editing (non-linear editing) on a hard disk having excellent accessibility has been proposed and put into practical use. However, the recording capacity of a hard disk is generally extremely small compared to a tape system, and the unit price of a medium is also expensive. Therefore, a combination of a tape system that is excellent in terms of recording capacity and media cost and a disk system that is excellent in accessibility is combined. A hybrid-type editing device has been proposed.
[0010]
For example, Japanese Unexamined Patent Publication No. Hei 5-101609 discloses that a part of each scene recorded on a tape (generally, a video signal for a few seconds at the beginning and end of each scene) is recorded on a disk and the video on the tape is recorded. A technology has been disclosed in which the address of a signal and the address of a video signal on a disk are managed in a unified manner, thereby complementarily complementing the poor accessibility of the tape system and the low recording capacity of the disk system. . Further, Japanese Patent Application Laid-Open No. Hei 5-101609 discloses that a well-known video compression technique is used to record a video signal on a disc, a nonlinear off-line editing is performed, an editing decision list is created, and a tape-to- An editing method for shifting to the main editing of a tape is also disclosed.
[0011]
[Problems to be solved by the invention]
However, in a conventional hybrid editing apparatus, a VTR of an analog recording system or an uncompressed digital VTR is basically assumed as a VTR to be used. In recent years, with the advance of video compression technology, those that can withstand broadcast image quality have been proposed, and compressed digital VTRs employing these video compression technologies have been proposed.
[0012]
According to the conventional hybrid-type editing apparatus, two video compression / expansion units are required, that is, a video compression / expansion unit used for recording a video signal on a disc and a video compression / expansion unit of a compression type digital VTR, which is expensive. In addition, there is a disadvantage that the hardware scale becomes large. For example, it is conceivable to use a common video compression / decompression device and use a single video compression / expansion device. However, in general, in order to withstand broadcast image quality, although the video compression technology has advanced, the data rate is a few. Ten Mbps is required, and it is difficult to realize from the viewpoint of the recording capacity of the disk, except for a method of taking a part of the material into the disk.
[0013]
In view of this, the present invention extracts and displays and records only the representative component when a video signal in a form separated into a signal representing a representative component and a signal representing a non-representative component other than the representative component is supplied. , Or by transmitting, a video signal processing device that can check the contents of the video signal at high speed, reduce the recording capacity, and transmit the video signal at a speed that can be practically used even on a transmission path with a relatively small transmission capacity. The purpose is to provide.
[0014]
[Means for Solving the Problems]
A video signal processing device according to the present invention receives a video signal including a DC component that is a signal representing a representative component and an AC signal that is a signal representing a non-representative component, and receives a DC component that is a signal representing the representative component from the video signal. And a recorder that records the representative component extracted by the representative component extractor on a recording medium. Wherein the representative component and the non-representative component in the video signal are fixed-length values, Thereby, the above object is achieved.
[0015]
In one embodiment, the apparatus further includes a display for displaying the representative component extracted by the representative component extractor.
[0016]
In one embodiment, the apparatus further includes a transmitter that outputs a signal representing the representative component extracted by the representative component extractor to a transmission path.
[0018]
In one embodiment, the apparatus further includes a magnetic tape reproducer that reproduces the video signal of the magnetic tape on which the video signal including the signal representing the representative component and the signal representing the non-representative component is recorded, and the representative component extractor includes: And extracting a signal representing the representative component from the video signal recorded on the magnetic tape reproduced at a higher speed than the normal reproduction.
[0022]
Further, the video signal processing device of the present invention reproduces a reproduced video by reproducing a magnetic tape on which a video signal including a DC component representing a representative component and an AC component representing a non-representative component is recorded. A magnetic tape reproducer for outputting a signal, a video signal output from the magnetic tape reproducer, a representative component extractor for extracting a signal representing the representative component from the video signal, and extraction by the representative component extractor A disk recorder that records a signal representing the representative component on a disk recording medium, and an edit area setting device that controls reproduction of the magnetic tape reproducer, The representative component and the non-representative component in the video signal are fixed-length values, Thereby, the above object is achieved.
[0023]
In one embodiment, the apparatus further comprises a magnetic tape recorder for recording a video signal output from the magnetic tape player on a magnetic tape.
[0026]
In one embodiment, the apparatus further comprises a buffer for holding the video signal before the video signal is received by the representative component extractor, wherein the signal representing the representative component of the video signal is held at a fixed length in a recording area of the buffer. The representative component extractor counts the number of bits output from the buffer in which the signal representing the representative component is held, and extracts the signal representing the representative component.
[0028]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. Like reference numerals indicate like components.
[0029]
(Example 1)
FIG. 1 is a block diagram of a first embodiment of a video signal processing device according to the present invention. In the figure, reference numeral 11 denotes a storage medium on which an encoded video signal is recorded, 12 denotes a communication terminal, 13 denotes a buffer, 14 denotes a representative component extractor, 15 denotes a camera, 16 denotes a computer, 17 denotes an encoder, Reference numeral 18 is a recording medium, and 19 is a display output terminal. Examples of the storage medium include a CD-ROM, a magnetic tape, a hard disk, and an optical disk. The storage medium 11, the communication terminal 12, and the encoder 16 are collectively referred to as an encoded video supply unit 20.
[0030]
The operation of the first embodiment will be described below.
[0031]
An encoded video signal in a form separated from the storage medium 11 or the communication terminal 12 into a representative component and a non-representative component other than the representative component is held in the buffer 13. Here, the “representative component” refers to a direct current (DC) component when an image is subjected to discrete cosine transform for each block of 8 × 8 pixels. Conversely, “non-representative component” refers to a non-DC component, that is, an AC component.
[0032]
The data held in the buffer 13 is supplied to the representative component extractor 14 in frame units. A video signal captured by the camera 15 or an image file (eg, a bitmap file) on the computer 16 is separated by the encoder 17 into a representative component and a non-representative component other than the representative component. The encoded data is supplied to the representative component extractor 14. The representative component extractor 14 extracts only the representative component from the video signal of the above-described form. The extracted representative components are recorded on a recording medium 18, and the recorded representative components are converted into an image by a display output terminal 19 and displayed.
[0033]
FIG. 2 is a block diagram of the representative component extractor 14. In FIG. 2, 21 is an input terminal, 22 is a flag determiner, 23 is a counter, 24 is a switch, and 25 is an output terminal. In the description of this operation, it is assumed that the video signal is such that the representative component and the non-representative component are supplied in a fixed length of a bit and b bit, respectively, after the head data is placed at the head as shown in FIG. I do. However, even if these are not of fixed length, this does not apply as long as the representative component can be detected by some method.
[0034]
FIG. 3 is a diagram schematically illustrating a data stream of an input video signal. In FIG. 3, “F”, “DC”, and “AC” indicate a flag, a representative component, and a non-representative component, respectively. When the video signal of the form shown in FIG. 3 is input from the input terminal 21, when the first data (that is, the flag F) is supplied by the flag determiner 22, after the last bit of the first data has passed, the counter 23 is cleared to zero. A signal is sent, and the value c of the counter 23 is set to 0. If the head data is not detected, 1 is added to the value c of the counter 23. If c ≦ a, the input of the counter 23 is a bit of the representative component, so the counter 23 sends an ON signal to the switch 24 and supplies the input bit to the output terminal 25. On the other hand, if a <c ≦ a + b, the input is a non-representative component bit. At this time, the counter 23 sends an OFF signal to the switch 24 and does not supply the input bit to the output terminal 25.
[0035]
When the value c of the counter 23 reaches a + b, the next bit to be supplied is a representative component, so the value c of the counter 23 is set to 0 again before the next bit is input. Thereafter, the next representative component is supplied to the output terminal 25 in the same manner as in the above-described operation.
[0036]
As described above, according to the first embodiment of the present invention, when a video signal is supplied from a variety of coded video supply units in a form separated into a representative component and a non-representative component other than the representative component, Only the representative component can be extracted from the video signal of the above-described form, and can be displayed or recorded.
[0037]
In this embodiment, the representative components recorded on the recording medium 18 are displayed and output. However, a configuration in which the representative components are directly displayed and output from the representative component extractor 14 is also possible. Further, the display output terminal 19 may not be provided in the configuration of FIG.
[0038]
The display output terminal 19 includes all types of monitors such as a non-interlaced monitor (for example, a personal computer monitor) including a VGA card and a projector, in addition to a normal interlaced monitor.
[0039]
The buffer 13 may be a nonvolatile recording medium such as a hard disk, in addition to a volatile recording medium such as a RAM.
[0040]
If the threshold value of the counter 23 is set to a as in the present embodiment, the representative component can be extracted as it is. However, for example, when it is desired to further reduce the capacity in recording or transmission, the threshold value is set to a or less. It is also possible.
[0041]
(Example 2)
FIG. 4 is a block diagram of a second embodiment of the video signal processing device according to the present invention. In the following embodiments, unless otherwise specified, a magnetic tape is used as an encoded video signal supply unit, and a video signal is divided into blocks each having 8 pixels in each of horizontal and vertical directions as a representative component. It is assumed that a DC component obtained by performing cosine transform (DCT) is used, and that a DC component of each block is recorded in a fixed area on a magnetic tape. However, it goes without saying that a similar effect can be obtained even in the case of another coded video signal supply unit.
[0042]
In FIG. 4, 41 is a magnetic tape, and 42 is a magnetic tape player.
[0043]
The operation of the second embodiment will be described below.
[0044]
The data recorded on the magnetic tape 41 is read by the magnetic tape reproducer 42 and held in the buffer 13 until data for one frame is read. From the data held in the buffer 13, only the DC component is extracted by the representative component extractor 14 and is recorded on the recording medium 18. The recorded DC component is converted into an image by the display output terminal 19 and displayed.
[0045]
FIG. 5 is a diagram showing an example of a configuration of one frame of a digital video signal of the NTSC system. The luminance signal (Y) is composed of 720 horizontal pixels and 480 vertical pixels, and the first color difference signal (Cr) and the second color difference signal (Cb) are composed of 180 horizontal pixels and 480 vertical pixels.
[0046]
An example of a method for recording these signals will be described below. For each of the luminance and both color difference signals, a block divided into 8 horizontal pixels and 8 vertical pixels is formed. FIG. 6 is a diagram schematically showing a block and a recording format of a video signal. The ratio of the number of pixels in the horizontal direction of the luminance signal, the first color difference signal, and the second color difference signal in one frame is 4: 1: 1. Therefore, as shown in FIG. 6A, a macro block composed of four Y blocks, one Cr block, and one Cb block located in the same area on the screen can be configured. Next, a discrete cosine transform (DCT) is applied to each block. The coefficients obtained by the discrete cosine transform are separated into a DC component and an AC component, and the AC component is divided by an appropriate quantization step and is subjected to variable length coding.
[0047]
FIG. 6B is a diagram showing an example of a recording area for recording video data of one macroblock on a recording medium. Y0 to Y4, Cr, and Cb correspond to the macroblock in FIG. This recording area has a fixed length. One byte (8 bits) of data is recorded in the vertical direction as upper bits in the figure, and byte position numbers are sequentially assigned in the horizontal direction. The encoded data is first recorded from the upper bit to the lower bit in the vertical direction, and then recorded in the horizontal direction in ascending order of the byte position number. On this recording area, the direct-current component is recorded in the DC area, and the variable-length-coded AC component is recorded in the AC area in a fixed length for each block.
[0048]
In the second embodiment, encoded data is sent from the buffer 13 to the representative component extractor 14 in the recording order described above. Therefore, the representative component extractor 14 can extract the DC component only by counting the number of bits of the input bit string in the same operation as that of the first embodiment.
[0049]
FIG. 7 shows the pixel relationship between the normal display image obtained by decoding the representative component (DC component) and the non-representative component (AC component) and the simplified display image displayed from the display output terminal 19 of this embodiment. FIG. When the block is composed of 8 × 8 pixels, the 8 × 8 block of the normal display image corresponds to one pixel of the simple display image. Therefore, when the size of the normal display image is 720 × 480 pixels, the size of the simple display image is 90 × 60 pixels.
[0050]
As described above, according to the second embodiment of the present invention, it is possible to construct a simplified display image smaller than the normal display image by extracting only the DC component from the fixed area on the magnetic tape. Further, the circuit scale for realizing the representative component extractor is small.
[0051]
Note that the size of the simplified display image is not limited to 90 × 60 pixels, and may be enlarged or reduced as needed. Further, when visual disturbance such as ringing appears in the simplified display image, the visual disturbance can be removed by using, for example, an appropriate filter.
[0052]
The size (recording capacity) of the recording area is not particularly defined as long as the DC and AC areas of each block have a fixed length.
[0053]
(Example 3)
FIG. 8 is a block diagram of a third embodiment of the video signal processing device according to the present invention. In FIG. 8, 81 is a transmitter, 82 is an external transmission path, and 83 is a receiver.
[0054]
In the following, the operation of the third embodiment will be described mainly on the parts different from the second embodiment.
[0055]
The DC component extracted by the representative component extractor 14 is subjected to encoding and packet division for transmission by a transmitter 81, and is transmitted via an external transmission path 82. The transmitted data is restored by the receiver 83 and recorded on the recording medium 18.
[0056]
As described above, according to the third embodiment of the present invention, it is possible to reduce the amount of transmission information without impairing the content of a video signal by performing channel coding on only the extracted DC component. It becomes.
[0057]
(Example 4)
FIG. 9 is a block diagram of a fourth embodiment of the video signal processing device according to the present invention. In FIG. 9, 91 is a recording medium controller, 92 is a recording medium, 93 is a display frame selector, and 94 is a multi-image display output terminal.
[0058]
In the following, the operation of the fourth embodiment will be mainly described only for parts different from the second embodiment.
[0059]
The display frame selector 93 generates data specifying a frame to be output according to an input from the user, and outputs the data to the recording medium controller 91. The recording medium controller 91 controls the recording medium 92 to select and extract data of a representative component (that is, a DC component) corresponding to the designated frame. As the recording medium 92, for example, a random access memory (RAM), a hard disk drive (HDD), an optical disk, a magnetic tape, or the like can be used. The data of the representative component corresponding to the frame specified by the display frame selector 93 is output from the recording medium 92 to the multiple image display output terminal 94 via the recording medium controller 91. The multiple image display output terminal 94 outputs, for example, a signal for displaying a plurality of simplified display images of the selected frame in one screen.
[0060]
As described above, according to the fourth embodiment of the present invention, a search for an edit point, particularly a search for a characteristic video such as a scene change, is easily performed by displaying the simplified display images side by side on one screen. It becomes possible. As described in the second embodiment, the size of the simplified display image is 1/8 of the size of the normal display image in both the horizontal and vertical directions unless enlarged or reduced. It is possible to display a simplified display image of up to 64 frames on the screen. Further, if a monitor with a high resolution of about 1280 pixels × 1024 pixels is used, more simplified display images can be displayed.
[0061]
In the description of the present embodiment, the case where the DC component is directly supplied from the representative component extractor 14 to the recording medium 92 has been described. A configuration for transmission is also possible.
[0062]
(Example 5)
FIG. 10 is a block diagram of a fifth embodiment of the video signal processing device according to the present invention. In FIG. 10, 101 is a first recording medium controller, 102 is a first recording medium, 103 is a transmission frame selector, and 104 is a second recording medium.
[0063]
In the following, the operation of the fifth embodiment will be described, mainly focusing on the differences from the third embodiment.
[0064]
The DC component extracted by the representative component extractor 14 is stored in the first recording medium 102 via the first recording medium controller 101. The transmission frame selector 103 operates so that the user can arbitrarily select a frame to be transmitted from the data held in the first recording medium 102. The DC component of the frame selected by the transmission frame selector 103 is encoded for transmission by the transmitter 81 and transmitted using the external transmission path 82. The DC component data received by the receiver 83 is temporarily stored in the second recording medium 104 and displayed from the display output terminal 19.
[0065]
As described above, according to the fifth embodiment of the present invention, by arbitrarily selecting a frame to be transmitted, the amount of transmitted information can be significantly reduced, and as a result, the amount of transmission information can be reduced. Even in the case of a transmission path of a rate, it is possible to transmit without damaging the contents of the video.
[0066]
In the present embodiment, it is also possible to adopt a configuration in which a DC component transmitted by selecting a transmission frame by the transmission frame selector 102 in advance is further selected and recorded or displayed on the receiving side.
[0067]
(Example 6)
FIG. 11 is a block diagram of a sixth embodiment of the video signal processing device according to the present invention. In FIG. 11, 111 is a tape feed motor, and 112 is a tape feed controller.
[0068]
In the following, the operation of the sixth embodiment will be described mainly on the parts different from the second embodiment.
[0069]
The tape feed motor 111 controls the running speed of the magnetic tape according to a control signal from the tape feed controller 112.
[0070]
Hereinafter, the case of high-speed reproduction in which the running speed of the magnetic tape is faster than usual will be described focusing on the operation of the reproducing head.
[0071]
FIG. 12 is a diagram showing a track 121 on the magnetic tape, a locus 122 of the center of the reproducing head at normal speed, and a locus 123 of the center of the reproducing head at high speed reproduction. “W” in the figure indicates the head width. At the time of reproduction at the normal speed, the reproduction head scans every track and reads all macro blocks. On the other hand, at the time of high-speed reproduction, data is read across a plurality of tracks by one scan of the reproducing head (hatched portion in FIG. 12). As with the second embodiment, the representative component extractor 14 extracts only the DC component from each of the macroblocks read out at this time. The extracted DC component is recorded on the recording medium 18 and output from the display output terminal 19. Here, "high speed" refers to a speed that is faster than normal playback.
[0072]
As described above, according to the sixth embodiment of the present invention, the DC component is extracted from the video data read when the magnetic tape is run at a higher speed than usual, so that a long time can be obtained. It is possible to more quickly know the contents of the recorded video signal over time, and further, it is possible to reduce the amount of information to such an extent that the recorded video is not indistinguishable.
[0073]
In the sixth embodiment, the output of the buffer 13 may be input to the transmitter 81. In this case, a representative component extractor 14 may be provided on the receiving side in order to obtain a representative component from the video signal transmitted via the external transmission path 82.
[0074]
(Example 7)
FIG. 13 is a block diagram of a video signal processing apparatus according to a seventh embodiment of the present invention. In FIG. 13, reference numeral 131 denotes an adaptive decoder. Hereinafter, the operation of the seventh embodiment will be described.
[0075]
The difference from the first embodiment is that the encoding format of the video data received on the recording medium 11 or by the communication terminal 12 is arbitrary. The supplied arbitrary encoded data is decoded by the adaptive decoder 131 according to each format. That is, the "adaptive" decoder decodes the input video signal by a decoding method corresponding to the encoding method of the input signal.
[0076]
The decoded data is encoded by the encoder 16 by separating a representative component and a non-representative component. The encoding is performed by, for example, intra-frame compression using discrete cosine transform.
[0077]
The encoded data is temporarily stored in the buffer 13, and then supplied to the representative component extractor 14, where the representative video is extracted. The extracted representative video is recorded on the recording medium 18 and displayed from the display output terminal 19, or is encoded by a transmitter 81 and is transmitted via an external transmission path 82 after being subjected to encoding suitable for transmission. Further, recording on the recording medium 18 and transmission to the external transmission path 82 may be performed.
[0078]
As described above, according to the seventh embodiment of the present invention, a representative component is extracted from a video signal encoded in an arbitrary format, and is displayed, recorded, or transmitted. Can be easily displayed, and the amount of information to be recorded or transmitted can be reduced.
[0079]
(Example 8)
FIG. 14 is a block diagram of an eighth embodiment of the video signal processing device according to the present invention. In FIG. 14, 141 is a disk recorder, 142 is a magnetic disk, 143 is a disk player, 144 is an edit area setting device, and 145 is a reproduction program setting device.
[0080]
The data recorded on the magnetic tape 41 is reproduced by a magnetic tape reproducer 42 as a video signal divided into a DC component and an AC component. The representative component extractor 14 extracts a DC component from the video signal reproduced from the magnetic tape reproducer 42. The extracted DC component is recorded on the magnetic disk 142 by the disk recorder 141. At this time, the time code normally recorded on the magnetic tape 41 is also recorded on the magnetic disk 142 at the same time. The DC component recorded on the magnetic disk 142 can be reproduced by the disk reproducer 143, and a simple image is displayed on the display output terminal 19.
[0081]
Next, the disk player 143 is operated by the editing area setting device 144 to operate the video signal recorded on the magnetic disk 142 (at this point, what is actually recorded on the magnetic disk 142 is recorded on the magnetic tape 41). A time code list corresponding to a necessary cut portion is created from the DC component of the video signal that has been processed. That is, operations such as fast-forward, rewind, and variable-speed playback are performed on the disc player 143 using a dial or the like attached to the editing area setting device 144, and the image on the display output terminal 19 constituted by a DC component is viewed. , A necessary cut is searched, and a time code start point and a time code end point of a necessary cut portion are sequentially registered. At this time, the start and end points of the time code are set so as to sufficiently include the necessary cut portion so that the editing point can be flexibly changed at the time of the final editing. That is, the editing area setting unit 144 outputs a control signal for performing coarse editing using the representative component to the magnetic tape player 42. This coarse editing means roughly editing on the order of seconds. As the control signal output from the editing area setting device 144, for example, a time code or the like is used. The magnetic tape player 42 controls the drive including rewinding and fast-forwarding the tape based on the time code.
[0082]
Next, the time code list corresponding to the necessary cut created by the editing area setting device 144 is transferred to the magnetic tape player 42. The magnetic tape reproducer 42 reproduces a video signal composed of a DC component and an AC component recorded in an area on the magnetic tape 41 corresponding to the time code list specified by the edit area setting device 144 again. The video signal reproduced by the magnetic tape reproducer 42 is recorded on the magnetic disk 142 by the disk recorder 141 both in the DC component and the AC component.
[0083]
When recording on the magnetic disk 142, since the DC component has already been recorded, only the necessary AC component may be recorded.
[0084]
Here, the video signal recorded on the magnetic disk 142 is reproduced by the disk reproducer 143, subjected to processing necessary for reproduction such as inverse DCT, restored to a high-quality image before DCT, and sent to the display output terminal 19. Image display becomes possible.
[0085]
Next, the reproduction program setting unit 145 performs final final editing on the video signal material recorded on the magnetic tape 41. That is, the video signal corresponding to the necessary cut portion selected in advance by the editing area setting unit 144 on the magnetic disk 142 (in this case, both the DC component and the AC component are recorded) has a high image quality. Set subtle edit points while displaying a nice image. That is, the reproduction program setting unit 145 outputs a control signal for performing fine editing in frame units to the disk reproduction unit 143. For an appropriate cut portion, special reproduction is designated, and the reproduction order of the cut group is set. Finally, the disk player 143 reproduces the video signal recorded on the magnetic disk 142 according to the reproduction program thus completed. This reproduced signal may be air-on-air as a broadcast video signal, or may be recorded and stored again on a recording medium such as a magnetic tape.
[0086]
(Example 9)
FIG. 15 is a block diagram of a ninth embodiment of the video signal processing device according to the present invention. In FIG. 15, reference numeral 151 denotes an editing content instruction list creator, 152 denotes a magnetic tape recorder, and 153 denotes a magnetic tape.
[0087]
Hereinafter, a ninth embodiment of the present invention will be described with reference to the drawings.
[0088]
First, the magnetic tape reproducer 42 reproduces a video signal divided into a DC component and an AC component from the magnetic tape 41. The representative component extractor 14 extracts a DC component from the video signal reproduced from the magnetic tape reproducer 42. The extracted DC component is recorded on the magnetic disk 142 by the disk recorder 141. At this time, the time code normally recorded on the magnetic tape 41 is also recorded on the magnetic disk 142 at the same time. The DC component recorded on the magnetic disk 142 can be reproduced by the disk reproducer 143, and a simple image consisting of only the DC component is displayed on the display output terminal 19.
[0089]
Next, the editing content instruction list creator 151 operates the disk reproducing device 143 to operate the video signal recorded on the magnetic disk 142 (at this point, what is actually recorded on the magnetic disk 142 is a magnetic tape. A time code list corresponding to a necessary cut portion is created from the DC component of the video signal recorded in 41. That is, fast forward, rewind, variable speed playback, and other operations are performed on the disc player 143 using a dial or the like attached to the editing content instruction list creator 151, and the image on the display output terminal 19 constituted by a DC component is displayed. While watching, a necessary cut is searched, and a time code start point and a time code end point of a necessary cut portion are sequentially registered. Also, instruction information of an appropriate reproduction speed is registered for the selected cut portion. Furthermore, the instruction information of the reproduction order of the selected cut group is registered.
[0090]
Next, the time code list corresponding to the necessary cuts created by the editing content instruction list creating unit 151, the instruction information of the reproduction speed of each cut, and the instruction information of the reproduction order of the cuts are stored in the magnetic tape reproducing unit 42 and the magnetic tape reproducing unit 42. The data is transferred to the tape recorder 152. The magnetic tape reproducer 42 again reproduces the video signal composed of the DC component and the AC component obtained by DCT, which is recorded in the area on the magnetic tape 41, according to the content designated by the editing content designation list creator 151. Reproduce. The video signal reproduced by the magnetic tape reproducer 42 is sequentially assembled and recorded on the magnetic tape 153 by the magnetic tape recorder 152, with both the DC component and the AC component. The video signal recorded on the magnetic tape 153 may be inserted into another reproducer, and the reproduced signal may be aired as a broadcast video signal, or may be inserted again into the magnetic tape reproducer 42 to repeat the above operation. Further details may be edited.
[0091]
By the way, in the above-described eighth and ninth embodiments, regarding the operation mode in which the DC component extracted by the representative component extractor 14 from the reproduction signal from the magnetic tape reproducer 42 is recorded on the magnetic disk 142, By reproducing the image 42 at a speed higher than the normal speed (special reproduction mode), the image information included in one screen for each frame frequency spans a plurality of frames, but the transfer execution time can be reduced. At this time, if the set reproduction speed of the magnetic tape reproducer 42 is set to about 5 to 10 times speed, in the case of a normal video signal material, an image quality with sufficient content identification can be obtained. In this case, when reproducing the magnetic disk 142, the original time change speed (reproduction speed) is achieved by reproducing the magnetic disk 142 by a reproduction speed ratio of the magnetic tape reproducer 42 with respect to the recording speed on the magnetic disk 142. Can be returned to.
[0092]
As described above, according to the eighth and ninth embodiments of the present invention, the representative component is extracted by the representative component extractor from the video signal separated into the representative component and the non-representative component other than the representative component. In addition, since the image display unit (that is, the display output terminal) is configured to be able to display an image on the monitor using only the representative component, for example, a video signal of the studio standard is discrete By using a signal resulting from compression by cosine transform (DCT) and using a DC component obtained by DCT as a representative component, the data rate of the representative component can be kept extremely low, and the recording capacity of the second recording medium is reduced. Do it.
[0093]
When a magnetic disk is used as the second recording medium, video signal materials recorded on a magnetic tape as the first recording medium, which is widely used, can be used at a time due to the cost and recording capacity of the magnetic disk. Since all of the data cannot be transferred to the magnetic disk, in most cases, an operation of selecting in advance which material on the magnetic tape is to be used occurs. Normally, this operation is performed by operating a VTR capable of reproducing a magnetic tape, but it takes an enormous amount of time due to the poor operation response speed due to the sequential recording medium. According to the present invention, this operation itself can be performed on a magnetic disk having excellent accessibility, so that the time can be significantly reduced.
[0094]
Also, since only the representative component is extracted by the representative component extractor, there is no need to separately provide an expensive video compression / expansion device.
[0095]
Further, in a first operation mode in which a representative component of a video signal recorded on the first recording medium is extracted and recorded on the second recording medium, the first reproducer reproduces a signal at a reproduction speed higher than usual. This can further reduce the time required for a series of editing operations.
[0096]
(Example 10)
FIG. 16 is a block diagram on the transmitting side of the tenth embodiment of the video signal processing device according to the present invention. FIG. 17 is a block diagram on the receiving side of the tenth embodiment of the video signal processing apparatus according to the present invention. 16, 161 is a frame signal extractor, 162 is a frame memory, 163 is a first selector, 164 is a control signal, and 165 is a transmitter. In FIG. 17, 171 is a control signal generator, 172 is a selection signal, 173 is a second selector, 174 is a frame signal processor, 175 is a non-representative component complementer, 176 is a frame memory, 177 is a control signal, and 178 is a control signal. A recording / reproducing device, 178a is a recording medium, 178b is a monitor, and 179 is a receiver.
[0097]
First, the operation on the transmitting side will be described with reference to FIG. The magnetic tape reproducer 42 reproduces a video signal in a form separated from the magnetic tape 41 into a representative component and a non-representative component other than the representative component. The frame signal extractor 161 extracts a frame signal, which is a signal for one screen, from the signal output from the magnetic tape reproducer 42 and records it in the frame memory 162. Further, the frame signal extractor 161 reads out the frame signal recorded in the frame memory 162 as necessary, and outputs it to the first selector 163. The frame signal extractor 161 thins out a plurality of frames representing a moving image at arbitrary intervals. For example, by thinning out frames, only two or three frames are output per second. The thinning interval depends on the data rate of the transmission path.
[0098]
The representative component extractor 14 extracts only the representative component from the video signal of the above-described form, and outputs the representative component to the first selector 163 as a representative component signal.
[0099]
The first selector 163 selects either the frame signal or the representative component signal according to the control signal 164 output from the transmitter 165, and outputs the selected signal to the transmitter 165. The transmitter 165 outputs the output from the first selector 163 to the external transmission path 82 as a first transmission signal. Further, the transmitter 165 receives the second transmission signal from the external transmission path 82 and outputs it as a control signal 164 to the first selector 163.
[0100]
Next, the operation on the receiving side will be described with reference to FIG.
[0101]
The control signal generator 171 outputs a control signal 177 to the second selector 173 and the receiver 179 according to the selection signal 172. The receiver 179 outputs the control signal 177 to the external transmission path 82 as a second transmission signal. Also, the receiver 179 receives the first transmission signal from the external transmission path 82, and if the first transmission signal is a frame signal, the receiver 179 sends a signal to the frame signal processor 174 if the first transmission signal is a representative component signal. Is output to the non-representative component complementer 175.
[0102]
The frame signal processor 174 records the frame signal output from the receiver 179 in the frame memory 176. Further, the frame signal processor 174 reads the frame signal recorded in the frame memory 176 and outputs it to the second selector 173 as a compressed video signal. At this time, as the compressed video signal, in the case of a frame signal representing a moving image, a frame signal compressed by thinning out in frame units according to the data rate of the transmission path is output, and in the case of a frame signal representing a still image, The frame signal may be repeatedly output a plurality of times.
[0103]
The non-representative component complementer 175 complements the representative component signal with a signal similar to the non-representative component, and outputs the signal to the second selector 173. Further, the non-representative component complementer 175 does not necessarily need to complement and output. One example of the operation of the non-representative component complementer is a method of applying an appropriate filter to the representative component signal.
[0104]
The second selector 173 selects either the output from the frame signal processor 174 or the output from the non-representative component complementer 175 according to the control signal 177 and outputs the selected output to the recording / reproducing device 178. The recording / reproducing device 178 records the selected output on the recording medium 178a or outputs the output to the monitor 178b. Here, the recording medium 178a is not limited to a tape-shaped recording medium, but may be a disk-shaped recording medium (for example, an HDD).
[0105]
The control signal 177 here is such that when the first selector 163 selects the output from the frame signal extractor 161, the second selector 173 selects the output from the frame signal processor 174. When the selector 163 selects the output from the representative component extractor 14, the control signal is such that the second selector 173 selects the output from the non-representative component complementer 175.
[0106]
In the present embodiment, the description has been given assuming that the transmitting side and the receiving side each have only a single function. However, a configuration in which both the transmitting and receiving sides have transmission and receiving functions may be employed.
[0107]
The control signal generator 171 is provided on the receiving side in the above embodiment, but may be provided on the transmitting side. In that case, the control signal 164 is transmitted to the selector on the receiving side through the selector and the transmission path on the transmitting side.
[0108]
(Example 11)
FIG. 18 is a block diagram of an eleventh embodiment of the video signal processing device according to the present invention. Note that the eleventh embodiment embodies the transmitter 165 of the tenth embodiment. In FIG. 18, 181 is a PCI bus, 182 is a built-in memory, 183 is a hard disk, 184 is a CPU, 185 is a modem, 186 is a data line from the first selector 163, 188 is a data line of the external transmission line 82, 189 is a control line of the external transmission line 82.
[0109]
An input signal provided from the first selector 163 in FIG. 16 through the data line 186 is stored in the internal memory 182 or the hard disk 183 through the PCI bus 181 in FIG. CPU 184 outputs an input signal recorded in internal memory 182 or hard disk 183 to modem 185. The control signal 164 output from the modem 185 via the PCI bus 181 is output to the first selector 163. The modem 185 performs predetermined signal processing on the input signal, and outputs a first transmission signal to the external transmission path 82 through the data line 188 and the control line 189. Further, the modem 185 receives the second transmission signal from the external transmission path 82 and outputs it as a control signal 164 to the PCI bus 181. Operations other than those described above are the same as in the case of the tenth embodiment.
[0110]
In this embodiment, the input signal is recorded in the built-in memory 182 or the hard disk 183. However, the present invention is not limited to the built-in memory or the hard disk, and any other recording medium may be used. The bus for transmitting the input signal and the control signal 164 is a PCI bus, but may be an ISA bus. It is assumed that the modem 185 outputs the first transmission signal to the external transmission line 82 and receives the second transmission signal from the external transmission line 82. Other circuits may be used as long as they can output.
[0111]
(Example 12)
FIG. 19 is a block diagram of a twelfth embodiment of the video signal processing device according to the present invention. The twelfth embodiment embodies the receiver 179 of the tenth embodiment. 19, the receiver 179 includes a CPU 184, a built-in memory 182, a hard disk 183, a computer 195 including a PCI bus 181, and a modem 191. Reference numeral 196 denotes a data line of the external transmission line 82, 197 denotes a control line of the external transmission line 82, and 198 denotes a data line to the non-representative component complementer 175 and the frame signal processor 174. The overall configuration of the video signal processing device according to the present embodiment is the same as that of the tenth embodiment.
[0112]
The modem 191 receives the first transmission signal from the external transmission path 82, performs predetermined signal processing, and outputs the signal to the internal memory 182 or the hard disk 183 via the PCI bus 181. Further, the control signal 164 is subjected to predetermined signal processing and output to the external transmission path 82 as a second transmission signal. The CPU 184 outputs a signal recorded in the internal memory 182 or the hard disk 183 to the frame signal processor 174 or the non-representative component complementer 175 through the PCI bus 181. At this time, when the signal output from the modem 191 is a frame signal, the signal is output to the frame signal processor 174, and when the signal is a representative component signal, the signal is output to the non-representative component complementer 175. Further, the control signal 164 output from the control signal generator 171 is output to the modem 191 through the PCI bus 181. Operations other than those described above are the same as in the tenth embodiment.
[0113]
In this embodiment, the output signal from the modem 191 is recorded in the internal memory 182 or the hard disk 183. However, the present invention is not limited to the internal memory or the hard disk, and any other recording medium may be used. The bus for transmitting the signal from the modem 191 and the control signal 164 is a PCI bus, but may be an ISA bus. It is assumed that the modem 191 outputs the second transmission signal to the external transmission path 82 and receives the first transmission signal from the external transmission path 82. Other circuits may be used as long as they can output.
[0114]
FIG. 20 is a diagram for explaining the twelfth embodiment of the present invention. The twelfth embodiment is the same as the tenth embodiment described using a specific configuration of a compressed video signal. In the figure, a compressed video signal is composed of a plurality of frame signals 201, and a plurality of packets 202 are set for each frame signal 201. Each packet 202 has an area for a frame head flag 203 and an area for data 204. The first packet of the first frame is called a first frame head packet 205, and the first packet of the second frame is called a second frame head packet 206. Then, the frame head flag 203 in the head packet of each frame is set to “head”, and the other frame head flags 203 are set to “non-head”. The overall configuration of the video signal processing device in this example is the same as that of the tenth embodiment.
[0115]
The compressed video signal is divided into packets 202 and transmitted. The frame signal extractor 161 in FIG. 16 can determine whether the packet is the head of the frame by looking at the contents of the frame head flag 203. At this time, the frame signal extractor 161 recognizes that the packet from the first frame head packet 205 to the packet immediately before the second frame head packet 206 appearing next is one frame, and recognizes this part as a frame signal. Extract as Operations other than the above are the same as in the tenth embodiment.
[0116]
In the present embodiment, the frame head flag 203 shown in FIG. 20 is located at the head of the packet 202, but may be located at any position of the packet 202.
[0117]
FIG. 21 is a diagram for explaining the twelfth embodiment of the present invention. The twelfth embodiment is a case where the video signal is an interlace signal in the tenth embodiment. In FIG. 21A, fields 211a, 211b, and 211c are fields composed of odd-numbered scanning lines, and fields 212a and 212b are fields composed of even-numbered scanning lines. A scanning line 213 indicated by a solid line is a scanning line included in the field, and a scanning line 214 indicated by a broken line is a scanning line not included in the field. As shown in FIG. 21B, in the frame 215, odd-numbered scanning lines 216 and even-numbered scanning lines 217 are alternately arranged.
[0118]
FIG. 22 is a diagram for explaining a variation of the tenth embodiment of the present invention. FIG. 22 shows a case where the video signal is a non-interlaced signal in the tenth embodiment. In FIG. 22A, fields 221a, 221b, and 221c indicate three consecutive frames. As shown in FIG. 22B, the frame 222 includes a plurality of scanning lines 223 scanned in the same vertical scanning cycle.
[0119]
FIG. 23 is a diagram showing a configuration of a compressed video signal in the tenth embodiment. In FIG. 23, the compressed video signal is composed of a plurality of packets 202, and each packet 202 is provided with an area for a signal identification flag 231 and an area for data 204. The signal identification flag 231 is a flag indicating whether the signal is an interlace signal or a non-interlace signal.
[0120]
First, an interlaced signal which is one of the video signals will be specifically described. As shown in FIG. 21A, the interlace signal is a video signal in which a field composed of only odd-numbered scanning lines and a field composed of only even-numbered scanning lines alternately appear. For example, only odd-numbered scanning lines exist in the field 211a at the time t0, and only even-numbered scanning lines exist in the field 212a at the time t1. In this case, the frame 215 is obtained by combining the field 211a and the field 212a as shown in FIG. That is, among the scanning lines included in the frame 215, the odd-numbered scanning lines 216 are the scanning lines of the field 211a, and the even-numbered scanning lines 217 are the scanning lines of the field 212a. At this time, since the field 211a and the field 212a are images at different times, a temporal shift occurs between the odd-numbered scanning line 216 and the even-numbered scanning line 217 of the frame 215. Therefore, when one image is extracted from the interlaced signal and displayed, the image is shifted. The video signal in the NTSC system, which is the current television broadcast, is an interlace signal as shown in FIG.
[0121]
Next, a non-interlaced signal which is another video signal will be specifically described. The non-interlace signal is different from the interlace signal, and as shown in FIG. 22A, the field 221a includes all the scanning lines. However, the number of fields included in a unit time is half that of an interlaced signal. That is, when the same time axis as in FIG. 21A is used, a field exists at times t0, t2, and t4, but no field exists at times t1 and t3. In this case, since the frame 222 includes only the field 221a, no time shift occurs in the scanning line 223. For this reason, even if one image is extracted and displayed, no image shift such as an interlace signal occurs.
[0122]
As described above, when transmitting an image of one frame, extracting a frame signal from a non-interlaced signal can transmit a more faithful image. Therefore, as shown in FIG. 23, the compressed video signal is divided into packets 202 and transmitted as a compressed video signal. The frame signal extractor 161 in FIG. 16 can determine whether the compressed video signal including the packet is an interlace signal or a non-interlace signal by looking at the signal identification flag 231. The frame signal extractor 161 extracts a frame signal only when the compressed video signal is a non-interlace signal. The operation of the other parts is the same as that of the tenth embodiment.
[0123]
In FIG. 23, the signal identification flag 231 is located at the beginning of the packet 202, but may be located anywhere in the packet 202. Further, although the video signal is either an interlaced signal or a non-interlaced signal, it may be a signal which can be arbitrarily switched.
[0124]
(Example 13)
FIG. 24 is a block diagram of a thirteenth embodiment of the video signal processing device according to the present invention. In FIG. 24, reference numeral 241 denotes a compressor.
[0125]
The data recorded on the magnetic tape 41 is read by the magnetic tape reproducer 42 and held in the buffer 13 until data for one frame is read. From the data held in the buffer 13, only the DC component is extracted by the representative component extractor 14. Since the DC component can also be regarded as a video signal, it is compressed by the compressor 241 to obtain compressed DC video data. The compressed DC video data obtained by the compressor 241 is recorded on the recording medium 18.
[0126]
As described above, according to the thirteenth embodiment, the amount of video data per unit time can be further reduced by using the compressed DC data obtained by further compressing the video composed of the DC component.
[0127]
(Example 14)
FIG. 25 is a block diagram of a fourteenth embodiment of the video signal processing device according to the present invention. In FIG. 25, reference numeral 251 denotes an expander.
[0128]
Hereinafter, only differences from the thirteenth embodiment will be described. The DC component is extracted by the representative component extractor 14, and the compressed DC data obtained by the compressor 241 is encoded and divided for transmission by a transmitter 81, and transmitted through an external transmission path 82. Is done. The transmitted data is restored by the receiver 83 and recorded on the recording medium 18.
[0129]
The compressed DC data recorded on the recording medium 18 is decompressed by the decompressor 251 to obtain video data consisting of only DC components. The video data obtained by the decompressor 251 is output from the display output terminal 19 as a simple display image.
[0130]
As described above, according to the fourteenth embodiment of the present invention, by further compressing the extracted DC component and performing channel coding, the amount of transmission information can be significantly reduced without impairing the content of the video signal. Can be reduced. As a result, a moving image can be transmitted even on a transmission line with a very low transmission rate.
[0131]
In the fourteenth embodiment, there is no recording medium 18, and the received data can be immediately expanded by the expander 251 to display a simple image.
[0132]
In the thirteenth and fourteenth embodiments, the compression method in the compressor 241 is arbitrary. That is, means for compressing the DC component is not limited.
[0133]
In each of the embodiments described above, the representative component is a DC component when DCT is applied to each M × N block. However, when the representative component includes a higher frequency component in addition to the DC component. However, the effect of the present invention can be obtained. For example, when an 8 × 8 component block is used as a DCT block, a 2 × 2 component or a 4 × 4 component on the low-frequency side of the 8 × 8 component block may be used as a representative component.
[0134]
FIG. 26 is a diagram illustrating blocks of 8 × 8 components of DCT coefficients obtained as a result of performing DCT on a block of 8 × 8 pixels. In FIG. 26, the upper left component is a DC component, and the other components are AC components. The frequency components in the horizontal direction increase as going to the right side of the block, and the frequency components in the vertical direction increase as going to the lower side of the block. As shown in FIG. 26, among the 8 × 8 DCT blocks, the 4 × 4 component on the low frequency side can be extracted and used as a representative component.
[0135]
It is not necessary to extract all the bits representing the DC component, and it is also possible to arbitrarily select the number of bits of the DC component to be extracted according to the recording capacity or the transmission rate.
[0136]
The above-described video signal processing method according to the present invention can be implemented using software or hardware, or both. When the method of the present invention is implemented as software, the software can be recorded on a recording medium and distributed, or can be distributed via a communication line or the like.
[0137]
【The invention's effect】
The present invention has at least the following effects. That is, the content of the video signal can be confirmed at high speed, the recording capacity can be reduced, and the video signal can be transmitted at a speed practically usable even on a transmission path with a relatively small transmission capacity.
[Brief description of the drawings]
FIG. 1 is a block diagram of a first embodiment of a video signal processing device according to the present invention.
FIG. 2 is a block diagram of a representative component extractor 14;
FIG. 3 is a diagram schematically illustrating a data stream of an input video signal.
FIG. 4 is a block diagram of a video signal processing apparatus according to a second embodiment of the present invention.
FIG. 5 is a diagram showing an example of a configuration of one frame of a digital video signal of the NTSC system.
FIG. 6 is a diagram schematically showing a block and a recording format of a video signal.
FIG. 7 is a diagram showing a pixel relationship between a normal display image obtained by decoding a representative component and a non-representative component and a simplified display image displayed from a display output terminal of the embodiment.
FIG. 8 is a block diagram of a third embodiment of the video signal processing device according to the present invention.
FIG. 9 is a block diagram of a fourth embodiment of the video signal processing device according to the present invention.
FIG. 10 is a block diagram of a video signal processing apparatus according to a fifth embodiment of the present invention.
FIG. 11 is a block diagram of a sixth embodiment of a video signal according to the present invention.
FIG. 12 is a diagram showing a track on a magnetic tape, a locus of the center of the reproducing head at normal speed, and a locus of the center of the reproducing head at high speed reproduction.
FIG. 13 is a block diagram of a video signal processing device according to a seventh embodiment of the present invention.
FIG. 14 is a block diagram of an eighth embodiment of the video signal processing device of the present invention.
FIG. 15 is a block diagram of a ninth embodiment of the video signal processing device according to the present invention.
FIG. 16 is a block diagram on the transmitting side of a video signal processing apparatus according to a tenth embodiment of the present invention.
FIG. 17 is a block diagram of a receiving side of a video signal processing apparatus according to a tenth embodiment of the present invention.
FIG. 18 is a block diagram of an eleventh embodiment of the video signal processing device according to the present invention.
FIG. 19 is a block diagram of a twelfth embodiment of the video signal processing device according to the present invention.
FIG. 20 is a diagram for explaining a twelfth embodiment of the present invention.
FIG. 21 is a diagram for explaining a twelfth embodiment of the present invention.
FIG. 22 is a diagram for explaining a variation of the tenth embodiment of the present invention.
FIG. 23 is a diagram illustrating a configuration of a compressed video signal in a tenth embodiment.
FIG. 24 is a block diagram of a thirteenth embodiment of the video signal processing device according to the present invention.
FIG. 25 is a block diagram of a fourteenth embodiment of the video signal processing device according to the present invention.
FIG. 26 is a diagram illustrating a block of 8 × 8 components of DCT coefficients obtained as a result of performing DCT on a block of 8 × 8 pixels.
[Explanation of symbols]
11 Storage medium
12 communication terminals
13 Buffer
14 Representative component extractor
15 Camera
16 Computer
17 Encoder
18 Recording media
19 Output terminal
20 Coded video supply unit

Claims (7)

A representative component extractor that receives a video signal including a DC component that is a signal representing a representative component and an AC component that is a signal representing a non-representative component, and extracts a DC component that is a signal representing the representative component from the video signal,
A recording device for recording the representative component extracted by the representative component extractor on a recording medium ,
The video signal processing device , wherein the representative component and the non-representative component in the video signal are fixed-length values . The video signal processing device according to claim 1, further comprising a display for displaying a representative component extracted by the representative component extractor. The video signal processing device according to claim 1, further comprising: a transmitter that outputs a signal representing a representative component extracted by the representative component extractor to a transmission path. A magnetic tape reproducer for reproducing the video signal of a magnetic tape on which a video signal including the signal representing the representative component and the signal representing the non-representative component is recorded,
The video signal processing device according to claim 1, wherein the representative component extractor extracts a signal representing the representative component from the video signal recorded on the magnetic tape that is reproduced at higher speed than normal reproduction. A magnetic tape reproducer that reproduces a magnetic tape on which a video signal including a DC component that is a signal representing a representative component and an AC component that is a signal representing a non-representative component is recorded, and outputs the reproduced video signal,
A representative component extractor that receives a video signal output from the magnetic tape player and extracts a signal representing the representative component from the video signal;
A disc recorder for recording a signal representing the representative component extracted by the representative component extractor on a disc recording medium;
An editing area setting device for controlling the reproduction of the magnetic tape player,
The video signal processing device , wherein the representative component and the non-representative component in the video signal are fixed-length values . 6. The video signal processing device according to claim 5 , further comprising a magnetic tape recorder that records a video signal output from the magnetic tape player on a magnetic tape. Prior to receiving a video signal by the representative component extractor, further comprising a buffer for holding the video signal,
A signal representing a representative component of the video signal is held at a fixed length in a recording area of the buffer,
The video signal processing device according to claim 1, wherein the representative component extractor counts the number of bits output from a buffer in which the signal representing the representative component is held, and extracts a signal representing the representative component.

Images