JP3136599B2 - Video signal recording device and video signal reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in the following order.

Means F acts G Example G ₁ 8 millimeter video Standard Description G ₂ video camera image for Solving the Problems E issues Summary C ART D invention FIELD B invention on A industry is to Solve Description of recording / reproducing unit G ₃ Description of audio recording / reproducing unit of video camera G ₄ Description of recording / reproducing unit of still image G ₅ Description of modified example H Effect of the invention A Industrial application field The present invention relates to a video signal recording device and a reproducing device suitable for application to a camera-integrated VTR.

B SUMMARY OF THE INVENTION The present invention is directed to a video signal recording apparatus suitable for application to a camera-integrated VTR, for example, in which one still image data is recorded on a plurality of tracks on a magnetic tape, and the number of tracks to be recorded is The image data is divided into a plurality of blocks of the same size or more, and the pixel data constituting the still image data in each block is divided into a plurality of tracks almost equally and recorded. , A good reproduced image can be obtained even when the image is missing.

Also, the present invention is a video signal reproducing apparatus suitable for application to a camera-integrated VTR, for example, in which a single still image recorded in a partial area of a track formed in a tilted manner on a magnetic tape. In reproducing data, when performing high-speed reproduction of the magnetic tape at a speed higher than the normal reproduction speed, the still image data reproduced from the magnetic tape is interpolated by an interpolation filter so that a good reproduced image can be obtained at the time of high-speed search. It was made.

C. Related Art Conventionally, a so-called electronic still camera that records a still image as an electric video signal on a magnetic disk has been developed. According to this electronic still camera, there is an advantage that, unlike a camera using a general silver halide film, processing such as development is not required, and a photographed still image can be immediately viewed simply by connecting to a television receiver.

D Problems to be Solved by the Invention However, still images shot by such an electronic still camera generally have lower resolution than still images shot by using a silver halide film, and an electronic image capable of shooting still images with higher resolution. Development of a still camera was requested. In this case, the size of the magnetic disk as a recording medium is limited, and there is a limit to the improvement in resolution using the magnetic disk.

For this reason, using a semiconductor memory as a recording medium, a video signal of a still image obtained by shooting is converted into a digital signal,
An electronic still camera has been developed in which this digital video signal is stored in a semiconductor memory for recording, and a high-resolution still image can be obtained. Cost was high, and it was used only for business use. On the other hand, video tape recorders (VTRs) have become widespread as consumer video equipment, and it has been demanded that high-resolution images can be recorded using the VTRs.

For this reason, the present applicant has previously disclosed in Japanese Patent Application No. 2-46816 such that a 1-field or 1-frame digital video signal is recorded in a PCM audio data recording section of a VTR in a format called 8 mm video. Suggested what was done. In this case, a digital video signal of one field or one frame is recorded over a PCM audio data recording unit of several tens to several hundred tracks. By recording a digital video signal in this manner, a high-resolution still image can be efficiently recorded.

By the way, when reproducing the digital video signal of a still image recorded in this way, a so-called high-speed search for searching a recording position of a desired still image by running a magnetic tape at a speed higher than a normal speed may be performed. . At the time of this high-speed search, for example, as shown in FIG. 12, the trajectory of the reproducing head traverses a plurality of tracks, and all signals recorded on each track cannot be reproduced. That is, FIG. 12 shows a state where each track is formed on the magnetic tape.
When a high-speed search is performed at double speed, one trajectory of the reproducing head indicated by a broken line crosses about nine tracks, and scans only about one-ninth. In this case, about 5/6 of each track
Is a video signal recording section V, and the remaining section is a PCM audio data recording section A. Due to azimuth loss, only signals indicated by hatching can be actually reproduced, and a digital video signal of a still image is recorded. Only a very small portion of the recording signal of the PCM audio data recording section A is reproduced. Therefore, it is difficult to reproduce a complete still image from a reproduction signal of a digital video signal of a still image recorded in the PCM audio data recording unit at the time of high-speed search, and it is difficult to reproduce a high-speed video signal recorded in the video signal recording unit V. There is an inconvenience that the recorded contents cannot be grasped as in the case of performing a search.

An object of the present invention is to make it possible to easily search for a still image signal recorded in this way.

E Means for Solving the Problems The present invention relates to a video signal recording apparatus for recording a single piece of still image data over a plurality of areas of a recording medium, the block comprising a predetermined plurality of adjacent pixels. One unit of still image data is divided into a plurality of units, and pixel data in each of the divided blocks is
The still image data is recorded so as to be distributed almost evenly in a plurality of areas where the still image data is recorded.

The present invention also relates to a video signal festival apparatus for reproducing one still image data recorded over a plurality of areas of a recording medium, wherein a plurality of predetermined still image data are recorded as one still image data. One still image data is divided into a plurality of blocks in units of blocks composed of adjacent pixels, and pixel data in each of the divided blocks is divided into a plurality of areas in which one still image data is recorded. In a video signal reproducing apparatus that reproduces from a recording medium on which recording is performed almost uniformly, when performing high-speed reproduction from the recording medium at a speed higher than the normal reproduction speed, the still image data reproduced from the recording medium is used as an interpolation filter. The data is supplied and the missing pixel data in the block is interpolated.

F function By doing so, for example, when a high-speed search is performed on the still image data recorded on the magnetic tape, even if only a part of the section is reproduced, the recorded data is almost equally divided. The data of each part constituting one still image can be obtained almost equally by the reproduction data of the part alone, and further, the approximate contents of the still image can be grasped by the interpolation processing of the data of each part. Becomes possible.

G. Embodiment An embodiment of the present invention will be described below with reference to FIGS.

G ₁ Explanation of 8 mm Video Standard In this example, a video camera of a standard called an 8 mm video tape recorder is used.
The standard of the millimeter video tape recorder will be described.

According to this standard, recording and reproduction are performed using a pair of rotary heads provided at an angular interval of 180 degrees from each other, and the tape is wound around a 221-degree range on the rotating surface of the head. The video signal is recorded / reproduced in the 180 degree section of the 221 degrees, and the digital (PCM) and time axis compressed audio signal is recorded / reproduced in the remaining 36 degree section. It has become.

That is, FIG. 9 shows a format of a recording track on a tape according to the above-mentioned standard, and a rush portion (51) for a rotation angle of the head of 5 degrees is provided at the front end from the right side where the head starts to contact the tape. In the latter half of the rush section (51) of 2.06 degrees (corresponding to three horizontal scanning periods (3H) of the video signal), a clock run-in section (52) that synchronizes with PCM data described later is provided. Following this run-in part (52), the PCM data part (53) of the time-base compressed audio signal
Is provided over 26.32 degrees. This data part (53)
After the period of 2.06 degrees (3H), a back margin part (54) for a recording position shift or the like at the time of after recording is provided, followed by a guard part (55) between a 2.62 degree video part and a PCM data part. Following this guard section (55), a video signal section (56) for one field is provided over 180 degrees. Further, a separation portion (57) for 5 degrees is provided after this.

Therefore, in this standard, after a video signal of one field is recorded and reproduced by the video signal part (56), an audio signal for 1/60 seconds during this period is converted to PCM and subjected to processing such as error correction. , Is compressed to about 1 / 6.8 on the time axis, and is recorded and reproduced in the PCM data section (53). The recording tracks are sequentially provided diagonally in the longitudinal direction of the tape, and continuous video signals and reproduction signals are recorded and reproduced.

By the way, in the above standard, the video signal part (56)
Dividing 180 degrees into 5 equals makes each 36 degrees. On the other hand, when the PCM data part (53), the rush part (51), 5 degrees, the subsequent back margin part (54), 2.06 degrees, and the guard part (55), 2.62 degrees, are exactly 36 degrees. Therefore, it has been proposed to form a recording / reproducing device dedicated to an audio signal by using a device of the above-mentioned standard.

FIG. 10 shows an example of the format of a recording track for that purpose. In the figure, the portion from the entry portion (51) on the side where the head starts to contact to the guard portion (55) is equivalent to the above standard, and this section is the first segment. Next, a rush portion (61), a run-in portion (62), a data portion (63), a margin portion (64), and a guard portion (65) having the same configuration as described above are provided from the start end side of the conventional video signal portion (56). , This section is the second segment. Further, a configuration similar to that of the second segment is repeatedly provided for every 36 degrees of the video signal portion (56), and is set as the third to sixth segments, respectively.
After this, a separation portion (57) for 5 degrees is provided.

Thereby, the first to sixth six segments are provided. For each of these segments, the rotational angle position of the rotary head is detected, and PCM data is output and recorded at a time corresponding to the desired segment (section) of 36 degrees from the head end of the head. , And by performing the reproduction by gating the time of the reproduction signal, each segment can be recorded and reproduced independently.
When re-recording is performed on a tape that has been used once, a so-called flying erase head is used to drive only the time when the head is in contact with a section of a desired segment, so that only that section is selectively performed. And can be re-recorded.

In this way, the PCM audio signal can be recorded and reproduced independently for each section of the tape divided into six in the width direction,
For example, using a tape that can be recorded for 4 hours and 30 minutes, 6
Twenty-seven hours of PCM audio signal recording and playback can be performed.

G In the description the example of a video recording and reproducing unit of ₂ video cameras obtained by the video camera of the Figure 9 and 8 mm video tape recorder standard shown in FIG. 10, be configured as shown in FIG. 1 . In this FIG.
(1) shows a CCD imager as a solid-state image sensor,
This CCD imager (1) is a so-called all-pixel reading type (Japanese Patent Laid-Open No. 1-188179) in which an image signal of an odd-numbered horizontal line and an image signal of an even-numbered horizontal line can be individually read out.
No.). This all-pixel readout type
The CCD imager (1) is, for example, as shown in FIG.
A color filter array comprising 494 (vertical) x 768 (horizontal) color filters of e, green G, cyan Cy, etc. is arranged, and each color filter of this color filter array is a CCD imager (1).
The signal charge based on the color light passing through each color filter is stored in each light receiving element in correspondence with the light receiving element arranged on the front surface of the light receiving element.

Then, the signal charges accumulated in the light receiving elements of the odd horizontal lines and the signal charges accumulated in the light receiving elements of the even horizontal lines are output from the other shift registers (1a) and (1b),
The outputs of the shift registers (1a) and (1b) are supplied to output circuits (2) and (3). Each of the output circuits (2) and (3) performs an output process such as sample hold, and outputs the image signals output from the output circuits (2) and (3) to the analog / digital converters (4) and (5). Supply and convert to digital imaging signal. Then, the digital imaging signals output from the analog-to-digital converters (4) and (5) are supplied to the imaging signal processing circuits (6) and (7), and the imaging signal processing circuits (6) and (7) A luminance component and a color difference component are extracted from the supplied image signal. In this case, when the number of horizontal lines of the image signal is n, the imaging signal processing circuit (6) the luminance component Y _n and color difference components (R-Y) _n, (B-
Y) _n, and the image signal processing circuit (7) extracts the luminance component Y _{n + 263} and the color difference components (RY) _{n + 263} and (BY) _{n + 263.}
And extract In other words, the output of the imaging signal processing circuit (6) and the output of the imaging signal processing circuit (7) are temporally and simultaneously output with signals shifted by 263 horizontal lines corresponding to one field. Therefore, when the image signal processing circuit (6) outputs the luminance component and the color difference component of the video signal of each line in the odd field, the image signal processing circuit (7) outputs the luminance of the video signal of each line in the even field. When the luminance and chrominance components of the video signal of the even field are output from the imaging signal processing circuit (6), the video signal of the odd field is output from the imaging signal processing circuit (7). Is output.

Then, the output Y _{n of} the imaging signal processing circuit (6), (R−
Y) _n and (BY) _n are supplied to digital-to-analog converters (8), (9) and (10), respectively, converted into digital signals, and then supplied to a video signal processing circuit (11). The video signal processing circuit (11) converts a video signal supplied as a luminance component and a color difference component into a video signal of a predetermined standard for recording, and converts the video signal via a RF circuit (12) to a rotating head drum. Is supplied to the magnetic head (13) mounted on the video tape (14), and is recorded on the video signal portion (56) of a standard track as shown in FIG. 9 formed on the video tape (14). In this case, a video signal is recorded one field at a time on one track.

The video signal reproduced from the video tape (14) by the magnetic head (13) is supplied to the video signal processing circuit (11) via the RF circuit (12), and the reproduced video signal is transmitted from the video signal processing circuit (11). Supply the signal to the output terminal (15).

In the description and the example of the voice recording and reproducing unit of G ₃ camcorder, an audio signal picked up microphone (not shown) supplied to the terminal (21) is supplied to a noise reduction circuit (22), this After performing noise reduction by the noise reduction circuit (22), the noise reduction circuit (22) supplies the analog signal to the analog-to-digital converter (23). The analog-to-digital converter (23) converts the audio signal into a digital signal. To the first fixed contact (24a). This switch (24) is used to connect the movable contact (24m) to the first fixed contact (24a) during digital audio signal recording / reproduction.
A signal obtained at the movable contact (24m) is supplied to a digital data processing circuit (25), and the digital data processing circuit (25) performs predetermined processing such as addition of an error correction code. After that, the data is supplied to a magnetic head (13) via an RF circuit (12), and is recorded on a PCM data portion (53) of a standard track as shown in FIG. 9 formed on a video tape (14).

The digital audio signal reproduced from the video tape (14) by the magnetic head (13) is supplied to the digital data processing circuit (25) via the RF circuit (12), and the digital data processing circuit (25) After performing correction and the like, it is supplied to a digital / analog converter (26) via a changeover switch (24). And this digital-analog converter (2
After being converted to an analog audio signal in 6), noise reduction is performed in a noise reduction circuit (22), and the processed audio signal is output from an audio signal output terminal (27).
Although not shown, the audio signal is also subjected to frequency multiplexing recording of the FM-modulated signal with the video signal, and the above-described recording of the digital audio signal is provided as an option, and is recorded as necessary.

G ₄ Explanation of still image recording / playback unit In this example, a digital video signal of a still image is recorded instead of a digital audio signal in the PCM data unit (53) where the digital audio signal is recorded in this manner. I can do it. That is, when in the still image recording mode, the luminance component and the color difference component (digital signal) of the video signal output from the imaging signal processing circuits (6) and (7) are supplied to the bit reduction circuit (31). After the data redundancy is reduced to a fraction by the bit reduction circuit (31), the data is supplied to the frame memory (32) and written at a predetermined timing. This writing is performed separately for the luminance component Y and the color difference components (RY) and (BY). In this case, the writing and reading of the frame memory (32) are controlled by the memory controller (33), the writing is performed by operating the still image recording switch (42) of the video camera, and the image signal processing circuit (6) and the imaging signal processing circuit (6). Since a video signal shifted by one field is output from the signal processing circuit (7), the output of the two processing circuits (6) and (7) is combined into a video signal for one frame to generate a frame memory (32). ).

Then, the video signal for one frame once stored in the frame memory (32) is read out at a relatively low transmission rate according to the above-described transmission rate of the digital audio signal under the control of the memory controller (33), and is read out serially. The data is supplied to a parallel conversion circuit (34), and is converted into serial data by the serial / parallel conversion circuit (34). Then, the serial data output from the serial / parallel conversion circuit (34) is supplied to the second fixed contact (24b) of the changeover switch (24). Here, when reading from the frame memory (32), the movable contact (24m) of the changeover switch (24) is connected to the second fixed contact (24b), and the serial / parallel conversion circuit (34) The serial data to be output is supplied to a digital data processing circuit (25). Then, the digital data processing circuit (25) performs predetermined processing such as addition of an error correction code in the same manner as when recording a digital audio signal, and supplies the processed data to a magnetic head (13) via an RF circuit (12).
A video signal for one frame is recorded as a still image signal in the PCM data section (53) of a standard track as shown in FIG. 9 formed on the video tape (14).

In this case, the PCM data part of one track (53)
Since the capacity that can be recorded on a single track is small, a video signal for one frame is recorded on a plurality of tracks. For example, it is assumed that a digital video signal for one frame output from the imaging signal processing circuits (6) and (7) is approximately 5.9 Mbits in total with luminance and color difference. Assuming that the bit reduction circuit (31) performs 62.5% compression, the frame memory (32) stores about 3.7 M bits as a video signal for one frame. Assuming that a signal of 3240 bytes can be recorded in the PCM data part (53) of one track, a video signal for one frame in about 144 tracks is recorded in the PCM data part (53).
Actually, a video signal for one frame is recorded on 149 tracks, with an allowance of 5 tracks for the 144 tracks. These 149 tracks are recorded / reproduced in about 2.5 seconds.

In this example, the digital data processing circuit (2
The video signal for one frame to be recorded is divided into a plurality of blocks and processed by processing in a frame memory (not shown) provided in 5). That is, for example, 1
Assuming that 480 lines are formed in the vertical direction as a digital video signal of a frame, and 768 pixels are formed in each horizontal line, as shown in FIG. And 0 to 3 in the vertical direction.
Nine forty blocks are arranged, 64 blocks of 0 to 63 are arranged in the horizontal direction, and the entirety is divided into 40 × 64 = 2560 blocks.

Then, a digital data processing circuit (25) records 144 pixels constituting one block on different tracks.
Output from That is, as described above, in this example, a digital video signal of one frame is recorded in the PCM data part (53) of a plurality of tracks, but the PCM data part (53) of one track contains one pixel of data from each block. Read and record only. The order in which the data of each pixel is read from each block (that is, the correspondence between the pixel positions in each block and the recording tracks) is determined by performing shuffling by an operation based on a preset calculation formula.

In the following, the operation at the time of performing this shuffling will be described with reference to the flowchart of FIG. 4. In this example, a pseudo random number is generated by a multiplication type congruential method. First, a numeral A (8 in this example) serving as a key is set. Since the shuffling of 144 pixels is performed in each block, random numbers from 0 to 143 are selected as the order of reading from the memory. The pixel position x before the start of the operation is set to 0, and the number of operations t is set to 0 first. . Then, the number of calculations t is 149 (the number of recording tracks).
When the number of operations t is 149 or less, a new random number is obtained by the operation shown in the following equation.

New random number = (A · random number) * 149 Here, in this formula, * is a symbol for calculating the remainder of (A · random number) divided by 149, and the new random number is (A · random number)
Divided by 149. Then, it is determined whether or not the new random number obtained by this operation is 144 or less. If the new random number is 144 or less, the pixel position x is moved by one unit. Track)
To Then, after adding the number of operations t, the number of operations t
Is less than or equal to 149, the calculation of the above equation is repeated.
Further, when the new random number obtained by the calculation is 144 or 144 or more, only the addition of the number of calculations t is performed without setting the order in which the pixels are read.

FIG. 5 shows an example in which the order of reading out the 144 pixels in each block is set, and the order in which the pixels in each block are read out and recorded on the track is determined by the random numbers thus obtained. A. As shown in FIG. 5A, they are distributed almost evenly in the block. FIGS. 5B, 5C, and 5D show examples of simulated pixels reproduced when only 1/3, 1/5, and 1/7 of the tracks recorded in this order can be reproduced. In the figure, as the number of reproducible sections decreases, the number of pixels to be reproduced decreases, but in any case, the pixels to be reproduced are distributed almost equally. Therefore, 3x speed, 5x speed, 7
The pixels reproduced when reproducing only the 1/3, 1/5, and 1/7 sections at the double speed are also substantially uniformly dispersed as shown in FIGS. 5B, 5C, and 5D.

Then, in this way, the PCM data section of each track (5
When reproducing one frame of a video signal as a still image signal recorded in 3), a digital video signal reproduced from a video tape (14) by a magnetic head (13) is transmitted through an RF circuit (12). To the digital data processing circuit (25). The digital data processing circuit (25) performs error correction and the like, and demodulates (de-shuffles) the shuffled state.
The signal is supplied to the serial / parallel conversion circuit (34) via 4). And this serial / parallel conversion circuit (34)
Converts the reproduced data into parallel data, and supplies the parallel data to the interpolation filter (43). The interpolation filter (43) performs an interpolation process on the supplied video data and outputs the data, and is constituted by a transversal filter as shown in FIG. That is, the interpolation filter supplies the video data supplied to the input terminal (51) to the coefficient multiplier (53 ₀ ), and a plurality of delay circuits (5
21 ₁ ), (52 ₂ ) ‥‥ (52 _m ). Then, the delay outputs of the respective delay circuits (52 ₁ ), (52 ₂ ) _m (52 _m ) are supplied to coefficient multipliers (53 ₁ ), (53 ₂ ) ‥‥ (53 _m ). Then, each coefficient multiplier (53 ₀ ), (53 ₁ ), (53 ₂ ) ‥‥ (5
The output of 3 _m) is supplied to an adder (54), to the output terminal (55) the addition output of the adder (54). With this configuration, the video data obtained at the input terminal (51) is interpolated and output from the output terminal (55). In this case, in the present example, the control data obtained at the terminals (44) and (45) change the coefficients of the coefficient multipliers (53 ₀ ) to (53 _m ) to change the interpolation amount. . This terminal (44)
Is supplied with playback speed information from a system controller (not shown) of the video camera.
Error information of the reproduction data is supplied from the digital data processing circuit (25), and the coefficients of the coefficient multipliers (53 ₀ ) to (53 _m ) are changed based on the respective information to change the interpolation amount. That is, when the reproduction speed is 1 time (normal speed reproduction), no interpolation is performed, and the amount of interpolation is increased as the reproduction speed changes to 2 or 3 times. Also, when an uncorrectable burst error occurs in the reproduced data, the interpolation amount is temporarily increased.

Here, an example of an interpolation state by the interpolation filter (43) will be described. For example, as shown in FIG. 7, a pixel indicated by x in both the vertical and horizontal directions is not reproduced as shown in a part of the screen,
It is assumed that data is obtained only from the pixel at the position indicated by ○ (the reproduced pixel is 1/9 of the whole). In such a case, when the data of the pixel which is not reproduced is obtained by interpolation, 16 pixels a, b, c ‥ of 4 pixels each in the horizontal and vertical directions
The interpolation state of the pixels b, c, e, f, i, j of the portion of ‥ p where there is no reproduction data is as follows.

b = (2a + d) / 3 c = (a + 2d) / 3 e = (2a + m) / 3 f = (2b + n) / 3 i = (a + 2m) / 3 j = (b + 2n) / 3 Pixel g without other reproduction data , h, k, l, n, o are obtained in a similar manner.

Then, the output of the interpolation filter (43) is written into the frame memory (32) under the control of the memory controller (33).

At this time, at the time of normal reproduction, the video signal for one frame is reproduced from the video tape in the same time (for example, 2.5 seconds) required for recording.

When the video signal for one frame is written into the frame memory (32), the video signal is read from the frame memory (32) to the bit reduction circuit (31) under the control of the memory controller (33), and the bit reduction circuit In step (31), the digital signal is restored to the original digital signal of the redundancy. At this time, the video signals of two fields constituting the video signal for one frame are alternately read in real time. That is, the video signal for one frame is repeatedly read in a 1/30 second cycle.
Then, the luminance signal Y and the color difference signal (R
-Y) and (BY) are supplied to the digital-to-analog converters (35), (36) and (37), respectively, and the respective digital-to-analog converters (35), (36) and (37) To convert into an analog luminance signal and a color difference signal. Then, the analog luminance signal and the color difference signal are supplied to an encoder (38) to be converted into a composite video signal, and the composite video signal is supplied from an output terminal (39) to a monitor receiver or the like. Further, the analog luminance signal and the color difference signal output from each of the digital / analog converters (35), (36) and (37) are supplied to a matrix circuit (40) and converted into primary color signals R, G and B. These primary color signals R, G, B are supplied from output terminals (41R), (41G), (41B) to a monitor receiver or the like.

By configuring the video camera of this example as described above,
A high-resolution still image converted into a digital signal is recorded. That is, when the recording mode is the still image recording mode, the digital audio signal is not recorded in the PCM data portion (53) of each track, and instead, a one-frame video signal converted into a digital signal at an arbitrary timing is output. Be recorded. In this case, for example, a still image recording switch is provided in the video camera, and this still image recording switch is operated while a continuous analog video signal is being recorded in the video signal section (56) of each track. The video signal at the moment when this switch is operated is also recorded as a digital signal. For example, as shown in FIG. 8, it is assumed that tracks T ₁ , T ₂ , T ₃ ‥‥ are sequentially formed on a video tape in the recording of a normal analog video signal, and the recording of the track T ₃ is performed. When operated the still image recording switch timing, PC digital video signal of the same video and analog video signals recorded on the video signal portion of the track T ₃ (56)
Recording in the M data section (53) is started. However, recording of the digital signal may be delayed by several tracks depending on the processing speed of the circuit. In this case, one frame recorded on the PCM data unit (53), as shown by hatching in FIG. 8, 149 tracks over performed until the track T _151, any subsequent track T ₁₅₂ At this timing, the recording of the still image converted into a digital signal becomes possible again.

Since the still image recorded in this manner is a one-frame video signal converted into a digital signal, the output of the CCD imager (1) is recorded with almost no deterioration, and each image recorded in the video signal unit (56) is recorded. A still image having a higher resolution can be reproduced as compared with a case where a still image is reproduced based on a field analog video signal or a case where an analog one-field video signal is recorded as in a conventional electronic still camera. By supplying an image reproduction signal to a video printer, a hard copy of a high-resolution still image can be obtained. In this case, in this example, since the digital video signal is recorded by using the configuration for recording the PCM audio signal of the video camera according to the standard of the 8 mm video tape recorder, a slight circuit such as a frame memory is used. You can record digital video signals simply by adding
Since the configuration as a recording / reproducing apparatus can be simplified, and a sub-region of a video tape which is not originally used for recording a video signal is used as a recording medium, efficient recording without waste is performed.

In the present example, the video data is divided into a plurality of blocks and recorded, and the plurality of blocks are equally recorded on each track. As shown in FIG. 5, pixel data of each part constituting one still image is obtained evenly, and the reproduced data is further processed by an interpolation filter (43).
, The recorded still image is reproduced although the resolution and the like are reduced. Therefore, even at the time of high-speed search, the approximate contents of the still image can be grasped, and the search for the still image can be performed. At the time of this search, for example, if still images are sequentially recorded on each track of the video tape (14), another still image is reproduced one after another every several seconds to a fraction of a second depending on the search speed. Become like Also,
In addition to the search, for example, even when some of the tracks constituting one still image are erased by mistake, one still image can be reproduced.

Further, in this example, even when a burst error or the like occurs during normal reproduction and the error rate of the reproduced data is lowered, the interpolation processing is performed by the interpolation filter (43), so that a good reproduced image is always obtained.

In the description noted above embodiment of G ₅ variation has been to record a digital video signal as a continuous recording simultaneously with the still image of the analog video signal as a moving video tape of the video signal portion (56) May record a dummy video signal (for example, a signal of only a synchronization signal having no video information) and may record only a digital video signal as a still image, or an 8 mm video shown in FIG. A multi-segment PCM standard of a tape recorder may be used to record only digital video signals as still images.
In this case, in addition to configuring the first to sixth segments as individual channels and recording still images individually for six channels, the first to sixth segments are used continuously for one channel. Digital video signals for frames may be recorded in a shorter time.

In the above-described embodiment, the order of recording pixel data of each divided block is set by shuffling by a predetermined operation. However, one pixel from one block is recorded on each track in order without shuffling. Is also good. That is, for example, as shown in FIG. 11A, one pixel may be recorded on each track in order from the upper left of each block. In this case, if the search is performed three times, five times, or seven times, pixel data can be obtained at regular intervals according to the search speed, for example, as shown in FIGS. A still image is reproduced by the interpolation processing in the filter.

Also, one pixel is recorded from one block on each track, but a plurality of pixel data of two or more pixels from one block may be recorded on each track.

Further, in the above-described embodiment, since the CCD imager (1) capable of outputting the imaging signals of all the pixels for one frame in one field period is used as the imaging means of the video camera, the video signal of one frame can be easily obtained. The video signal of one frame is converted into a digital signal and recorded. However, when a device capable of obtaining only one field of the image signal is used as the image capturing means, only the digital video signal of one field is converted to a still image. It may be recorded as a signal. However, in this case, the vertical resolution of the recording video signal is reduced to half that in the case of frame recording.

In the above-described embodiment, the imaging signal of the video camera is recorded as a digital video signal.
A video signal supplied from another video device such as a VTR may be recorded for one frame or one field.

Furthermore, the present invention is not limited to the above-described embodiment, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.

H Advantageous Effects of the Invention According to the present invention, when high-speed search of still image data is performed, even if only a part of the section is reproduced, the recorded data is divided almost equally. The data of each part constituting one still image can be obtained almost equally, and the approximate contents of the still image can be grasped by the interpolation processing of the data of each part. Will be

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is an explanatory diagram showing an example of an imager of one embodiment, FIG. 3 is an explanatory diagram showing a recording block of one embodiment, and FIG. FIG. 5 is a flowchart for performing shuffling in one embodiment, FIG. 5 is an explanatory diagram showing a shuffling state, FIG. 6 is a configuration diagram showing an interpolation filter in one embodiment, and FIG. FIG. 8 is an explanatory diagram showing a recording track according to an embodiment, FIGS. 9 and 10 are explanatory diagrams showing an 8 mm video standard, and FIG. 11 is a recording according to a modification of the embodiment. FIG. 12 is an explanatory diagram showing a state, and FIG. 12 is an explanatory diagram showing a reproduction locus at the time of a search. (1) is a CCD imager, (4) and (5) are analog-to-digital converters, (6) and (7) are imaging signal processing circuits, (25) is a digital data processing circuit, and (31) is a bit reduction circuit. , (32) is a frame memory, (34) is a serial / parallel conversion circuit, (35), (36) and (3)
7) is a digital / analog converter, and (43) is an interpolation filter.

Claims (2)

(57) [Claims] 1. A video signal recording apparatus for recording one still image data over a plurality of areas of a recording medium, wherein one still image data is stored in a block unit consisting of a predetermined plurality of adjacent pixels. While dividing the image data into a plurality, the pixel data in each of the divided blocks is
A video signal recording apparatus in which a still image data is recorded in a plurality of areas where one still image data is recorded in a substantially evenly distributed manner. 2. A video signal reproducing apparatus for reproducing one still image data recorded over a plurality of areas of a recording medium, wherein the one still image data is a plurality of still image data. One piece of still image data is divided into a plurality of blocks in units of adjacent pixels, and pixel data in each of the divided blocks is
In a video signal reproducing apparatus that reproduces from a recording medium in which a single piece of still image data is recorded almost uniformly distributed in a plurality of areas where one still image data is recorded, when performing a high-speed reproduction faster than a normal reproduction speed from the recording medium A video signal reproducing apparatus which supplies still image data reproduced from the recording medium to an interpolation filter to interpolate missing pixel data in a block.