JP2008312005A - Video recording apparatus, recording confirmation apparatus, and recording confirmation system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recording confirmation system for confirming a recording condition of a storage medium in real time without increasing the size, cost and power consumption. <P>SOLUTION: A video recording apparatus has a first coding means (103) compressing a video signal obtained by an imaging means at low compression rate, and generating a first coded data; a recording means (104) recording the first coded data in a storage medium; and a reproduction means (106) selecting the first coded data according to a predetermined rule to generate partially coded data; a second coding means (107) compressing the video signal at a high compression rate to generate second coded data; a transmitting means (108) multiplexing the partially coded data and the second coded data to transmit the multiplexed data; a receiving means (109) receiving a comparison result obtained by comparing the transmitted partially coded data with the transmitted second coded data; and a notification means (110) outputting the comparison result. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a video recording apparatus that records video, and a recording confirmation system that enables confirmation of the video recorded by the video recording apparatus.

  Conventionally, video cameras that use video tape as a recording medium record video on a video tape with a recording head, and at the same time, use the simultaneous playback head to play back the video immediately after recording and record the material on the video tape correctly. It has a function that can confirm whether it is done.

  After recording the material, the device was switched to the playback mode and a part of the recorded material was played to check whether the material on the video tape was recorded correctly. In particular, in the broadcast business field, recording accidents become a very big problem.

  In recent years, optical disks, hard disks, semiconductor memories, etc. that can be randomly accessed have come to be used as recording media, but the same recording confirmation method as video tapes has been taken.

JP 58-54791 A JP-A-3-288377

  In a conventional video recording apparatus, video is recorded on a video tape by a recording head, and at the same time, the video immediately after being recorded is reproduced using a simultaneous playback head (see Patent Documents 1 and 2, etc.). For this reason, a reproduction processing circuit must be mounted in addition to the video signal recording processing circuit, resulting in an increase in circuit scale, cost, and power consumption. Since the video camera is a portable device, the size of the device and the increase in power consumption are particularly disadvantageous as commercial value.

  In addition, after recording the material, you can switch to the playback mode to play back a part of the recorded material and check whether the material on the video tape is recorded correctly. Therefore, there is a problem that it cannot be applied when continuous recording is required.

  A video camera using a randomly accessible optical disk, hard disk, semiconductor memory or the like as a recording medium has the same problem.

  The present invention has been made to solve the above-described problems, and the object of the present invention is to record the recording state of a material on a recording medium without increasing the size, cost, and power consumption of the device. An object is to provide a video recording apparatus and a recording confirmation system that can be confirmed in real time.

  The recording confirmation system according to the present invention is a recording confirmation system for confirming a recording state of a photographed video, and includes a video recording device for recording a video and a recording confirmation device for confirming a recording state of the recorded video.

  The video recording apparatus includes: an imaging unit that captures video; a first encoding unit that compresses a video signal captured by the imaging unit at a first compression rate to generate first encoded data; Recording means for recording the encoded data on the recording medium, reproduction means for reading out the first encoded data from the recording medium, selecting a part according to a predetermined rule, and generating partial encoded data, and imaging means A second encoding unit that compresses the captured video signal at a second compression rate higher than the first compression rate and generates second encoded data; and a partial encoding generated by the reproducing unit The transmission means for multiplexing and transmitting the data and the second encoded data generated by the second encoding means, and comparing the partially encoded data and the second encoded data transmitted by the transmission means Received comparison results Comprising a receiving unit, and a notification unit for outputting a comparison result.

  The recording confirmation device uses a part of the transmission band to receive the first encoded data and the second encoded data, and expands the first encoded data received by the receiving means. A first decoding means for generating a first video signal; a second decoding means for expanding the second encoded data received by the receiving means to generate a second video signal; Comparing means for comparing one video signal with the second video signal, and transmitting means for transmitting a comparison result of the comparing means.

  ADVANTAGE OF THE INVENTION According to this invention, the recording confirmation system which can confirm the recording state of the raw material to a recording medium in real time can be provided, without increasing the magnitude | size of an apparatus, cost, and power consumption.

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

1. Configuration of Recording Confirmation System FIG. 1 shows the configuration of the recording confirmation system of the present invention. The recording confirmation system includes a video recording apparatus 101 that records video and a recording confirmation apparatus 120 that confirms a recording state of the recorded video.

1.1 Video Recording Apparatus The video recording apparatus 101 includes an imaging unit 102, a low compression encoding unit 103, a recording unit 104, a recording medium 105, a reproduction unit 106, a high compression encoding unit 107, and a transmission unit. 108, a reception unit 109, and a notification unit 110.

  The imaging unit 102 captures a subject and converts optical information of the subject into a video signal. The low compression encoding unit 103 encodes the video signal generated by the imaging unit 102 according to a predetermined encoding algorithm at a relatively low compression rate, and generates low compression encoded data. That is, the low-compression encoded data provides a high-quality image for use as the main part material.

  The recording unit 104 records the low-compression encoded data generated by the low-compression encoding unit 103 on the recording medium 105 as a main part material.

  The recording medium 105 is an optical disk such as a DVD (Digital Versatile Disk), a magnetic disk such as an HDD (Hard Disk Drive), or a semiconductor memory such as an SD card or a P2 card. A sequential access medium such as a video tape conventionally used may be used, but a random accessible medium is preferable. The video recording apparatus 101 can mount a plurality of different recording media as the recording medium 105. In this case, continuous recording can be performed over a plurality of recording media while switching the recording medium.

  The reproduction unit 106 selects (thinens) and reproduces the low-compression encoded data recorded on the recording medium 105 by a predetermined method, and generates a partial main material (hereinafter referred to as “partial main material”). .

  The high compression encoding unit 107 encodes the video signal captured by the imaging unit 102 at a compression rate higher than the compression rate of the low compression encoding unit 103 according to a predetermined encoding algorithm, and generates high compression encoded data To do. The highly compressed encoded data is used as data for rough editing (hereinafter referred to as “low resolution material”).

  The transmission unit 108 multiplexes the partial main material generated by the reproduction unit 106 and the low-resolution material for rough editing generated by the high compression encoding unit 107 and transmits the multiplexed material to the recording confirmation apparatus 120. The transmission unit 108 transmits data to the recording confirmation apparatus 120 via a communication medium such as a wireless LAN, a public line, or a dedicated communication line.

  The receiving unit 109 receives a video comparison signal (described later) transmitted from the recording confirmation device 120. The notification unit 110 notifies an operator such as a cameraman of the video comparison signal received by the reception unit 109 through video and audio output.

  The video recording apparatus 101 has a recording start button for instructing start of video recording operation and a recording end button for instructing stop of recording operation.

1.2 Recording Confirmation Device The recording confirmation device 120 includes a receiving unit 112, a low compression decoding unit 113, a high compression decoding unit 114, a video comparison unit 115, and a transmission unit 116.

  The receiving unit 112 receives both data of the main part material and the low-resolution material for coarse editing transmitted from the transmitting unit 108 of the video recording apparatus 101, and separates and outputs these data.

  The low compression decoding unit 113 decodes the partial main material separated by the receiving unit 112, that is, the partial low compression encoded data, to a decoding algorithm corresponding to the encoding algorithm of the low compression encoding unit 103 of the video recording apparatus 101. To generate a partial high-resolution video signal.

  The high compression decoding unit 114 corresponds to the encoding algorithm of the high compression encoding unit 107 of the video recording apparatus 101 for the low resolution material for coarse editing separated by the receiving unit 112, that is, high compression encoded data. Decoding by a decoding algorithm generates a low-resolution video signal.

  The video comparison unit 115 compares the partial high resolution video signal decoded by the low compression decoding unit 113 with the low resolution video signal decoded by the high compression decoding unit 114 by a predetermined method, and compares the comparison result. Output as video comparison signal.

  The transmission unit 116 transmits the video comparison signal obtained by the video comparison unit 115 to the video recording apparatus 101. In that case, the same communication medium as the transmission part 108 may be used, and another communication medium may be used.

2. A description will be given of the operation of the recording verification system shown in Operation Figure 1 of the recording verification system. The video recording apparatus 101 is carried by a cameraman or the like, and the recording confirmation apparatus 120 is arranged and used at a broadcasting station or the like.

  The cameraman goes to a coverage area away from the broadcasting station and performs coverage (image recording) using the video recording device 101. The main material for broadcasting in a news program or the like must be encoded with as high a picture quality as possible, that is, with a low compression rate, in order to satisfy the viewer.

  The video signal imaged by the imaging unit 102 is data-compressed at a low compression rate by the low compression encoding unit 103, and is recorded on the recording medium 105 via the recording unit 104. The recording medium 105 in which the main part material is recorded is brought back to the broadcasting station by the photographer after the interview is completed, and after the main editing, it is broadcast on a news program or the like.

  Before the recording medium 105 on which the main material is recorded is brought back to the broadcasting station, the editor in the broadcasting station records the main material and simultaneously creates a low-resolution material and transmits it to the broadcasting station for rough editing. Is done. In general, a low-resolution material is transmitted using a wireless LAN having a low transmission band and a communication medium such as a public line, and therefore must be encoded with a compression rate as high as possible.

  The video signal imaged by the imaging unit 102 is data-compressed at a high compression rate by the high compression encoding unit 107 to obtain high compression encoded data. The highly compressed encoded data is transmitted to the broadcast station by the transmission unit 108. Using the low-resolution material that is data-compressed at this high compression rate, the editor staying in the broadcast station can immediately finish the rough editing. As a result, it is possible to greatly shorten the work time from when the cameraman brings the recording medium 105 recorded with the main part material back to the broadcasting station until the main editing is completed.

  The video recording apparatus 101 according to the present embodiment enables the main material recorded on the recording medium 105 to be recorded on the recording medium 105 via the recording unit 104 in order to check whether the main material recorded on the recording medium 105 is normally recorded. The main material reproduced by the reproducing unit 106 immediately after being recorded is transmitted together with the low resolution material for rough editing to the recording confirmation device 120 in the broadcasting station by the transmitting unit 108.

  Since the recording medium 105 is a randomly accessible medium, it is relatively easy to reproduce the main material immediately after recording. Since the video recording apparatus 101 is a device for broadcasting business, recording the main part material on the recording medium 105 must be given priority over anything else. Therefore, it is necessary to preferentially secure the recording rate by the recording unit 104 out of the overall access rate of the recording medium 105 and use the remaining rate for reproduction by the reproducing unit 106. For this reason, there is a possibility that all of the main material recorded on the recording medium 105 cannot be reproduced. Alternatively, since the overall access rate is lowered in order to reduce the power consumption of the entire device, it may not be possible to reproduce all the main material recorded on the recording medium 105.

  In addition, since the main material is compressed at a low compression rate, the amount of data is large, and it is difficult to transmit all the main material to a broadcasting station using a wireless LAN with a low transmission band and a communication medium such as a public line. is there. Therefore, in the present embodiment, a part of the main part material is selected and reproduced.

  FIG. 2 is a diagram illustrating a state in which the low-resolution material for coarse editing and the partial main material are multiplexed and transmitted in the transmission channel. The transmission channel 200 is a communication medium such as a wireless LAN or a public line. The width of the transmission channel 200 depicted in the figure corresponds to the size of the transmission band. The transmission channel 200 includes a transmission band B1 for transmitting a low resolution material. The partial main material is transmitted to the remaining transmission band B2 excluding the transmission band B1 from the entire band B of the transmission channel 200. In the figure, the area of the rectangle representing the encoded data for one frame corresponds to the data amount of the frame, and the number in the rectangle represents the frame number. The low-resolution material has a small amount of data for one frame, but since the editor performs rough editing at the broadcasting station, all frames need to be transmitted. For this reason, the transmission band B1 for transmitting the low-resolution material occupies most of the transmission band B of the transmission channel 200.

  The main material generated by the low-compression encoding unit 103 has a large amount of data because the data is compressed at a low compression rate, and the remaining transmission band B2 other than the transmission band B1 for transmitting the low-resolution material is used for the transmission. Must be used. Therefore, when reproducing the main material recorded on the recording medium 105, the reproducing unit 106 selects (decimates) the encoded data as a partial main material at a rate of one frame every 30 frames.

  As described above, in this embodiment, the low-resolution material for rough editing and the high-quality partial main material are multiplexed by the transmission unit 108 and transmitted to the broadcasting station. In addition to the partial main material and the low-resolution material, additional information (time code or the like) of these video signals may be transmitted from the transmission unit 108.

  On the other hand, in the broadcast station, the editor performs rough editing using the low-resolution material among the received low-resolution material and partial main material for rough editing. At the same time, the recording confirmation device 120 arranged in the broadcasting station confirms the recording state of the main material recorded on the recording medium 105 of the video recording device 101 by comparing the low resolution material and the partial main material. Is called.

  The data of the low resolution material and the partial main material that have been multiplexed and transmitted by the video recording device 101 are received by the receiving unit 112 of the recording confirmation device 120. As shown in FIG. 2, after being multiplexed and transmitted in the same communication medium, they are received by the receiving unit 112 of the recording confirmation device 120, and are separated into a low resolution material and a partial main material and output.

  The partial main part material is decoded by the low compression decoding unit 113, and a partial main part video signal is obtained. Similarly, the low resolution material is decoded by the high compression decoding unit 114, and a low resolution video signal is obtained. The partial main video signal and the low resolution video signal are compared by the video comparison unit 115.

  With reference to FIG. 3, a comparison operation between the partial main video signal and the low resolution video signal in the video comparison unit 115 will be described.

  In the figure, the size of a rectangle representing a video signal for one frame represents the size of an image, that is, the number of pixels. Since the low resolution video signal shown in FIG. 3A has a low resolution, the number of pixels for one frame is small. On the other hand, since the partial main video signal shown in FIG. 3B has a high resolution, the number of pixels for one frame is large. Since one main material is selected every 30 frames by the video recording apparatus 101, the frame numbers of the partial main video signals are discrete values such as 0, 30,. The video comparison unit 115 selects a low resolution video signal having the same frame number as the frame number of the partial main video signal, and compares it with the corresponding partial main video signal.

  An image pattern matching technique is used as a comparison method. Since the image pattern matching technique is a known technique, it will be briefly described. For example, after down-converting the number of pixels of the partial main video signal to the number of pixels of the low-resolution video signal, the cumulative average of the differences for each pixel of the two video signals is calculated. " Alternatively, the partial main video signal and the low-resolution video signal are each subjected to Fourier transform and then compared on the frequency axis, and if the difference is equal to or less than a predetermined value, it is determined that “match”.

  In addition, when noise is generated due to a flip-flop latch error or the like on the electric circuit of the video recording apparatus 101, the difference between a pixel and its adjacent pixels or the frequency after Fourier transform using only the partial main video signal It is possible to judge the quality of the image recording state by analogizing the state of noise from the on-axis characteristics.

  For example, the main material recording / reproducing system operation (that is, a series of operations of the low-compression encoding unit 103, the recording unit 104, the recording medium 105, and the reproducing unit 106) in the video recording apparatus 101, and the low-resolution material When an abnormality occurs in at least one of the generation operations (that is, the operation of the high compression encoding unit 107), noise is mixed in the partial main video signal or the low resolution video signal. As a result, since the video comparison unit 115 determines “mismatch”, an abnormal operation of the video recording apparatus 101 can be detected.

  The comparison result obtained as described above is transmitted to the video recording apparatus 101 by the transmission unit 116. The data amount of the comparison result is very small, and is composed of a match / mismatch determination result and a corresponding frame number. The communication medium for transmitting the comparison result may be the same as that used in the transmission unit 108, or another communication medium may be used.

  Again, in the video recording apparatus 101 in the coverage area, based on the comparison result received by the receiving unit 109, the notification unit 110 notifies the cameraman of the recording state. For example, when the notification unit 110 is a viewfinder of a camera, as shown in FIG. 4, “frame number: 30 abnormal” is displayed as a recording state. By switching to the camera and continuing the interview, there is an effect of preventing recording accidents.

  As described above, according to the recording confirmation system of the present embodiment, from the video recording apparatus side, the low-resolution material with low image quality for rough editing and the partial main material that is a high-quality but partially thinned image , And the recording confirmation device compares both data to confirm the recording state on the recording medium. According to this configuration, since it is not necessary to separately mount a reproduction process or the like in the recording apparatus for checking the recording state, the circuit scale, cost, power consumption, etc. are not increased.

3. In the above-described embodiment, for ease of explanation, the video recording apparatus and the recording confirmation system record and reproduce only the video and confirm the recording. However, the audio and other data are simultaneously recorded and reproduced and confirmed. You may do.

  In the above-described embodiment, the recording confirmation device 120 is disposed at a broadcasting station or the like. However, the installation location of the recording confirmation device of the present invention is not limited to a broadcasting station or the like. It may be a place spatially separated from the video recording apparatus 101 carried by the cameraman. If the recording confirmation apparatus 120 is in a place where a stable power supply can be received, the recording confirmation of the main material recorded on the recording medium 105 can be performed without substantially increasing the battery consumption of the video recording apparatus 101. Even if the recording confirmation device 120 is located away from the broadcast station that receives the low-resolution material for coarse editing, if the communication form such as multicast is used, the transmission unit 108 in the video recording device 101 has the same low resolution. The material need not be transmitted twice to each of the recording confirmation device and the broadcast station, and can be easily transmitted.

  In the above-described embodiment, the main material is data-compressed at a low compression rate by the low-compression encoding unit 103, but may be uncompressed in order to maintain high image quality.

  In the above-described embodiment, the low-resolution material includes data of all frames, but may include only data of some frames. For example, one frame out of two frames of the captured video signal may not be transmitted. However, in this case, as a method of selecting the main material in the reproduction unit 106, it is preferable to select so that the same frame number as the frame included in the low resolution material is included.

In the above-described embodiment, encoded data of one frame is selected and reproduced every 30 frames when the reproduction unit 106 reproduces the partial main material used for comparison with the low-resolution image. However, the present invention is not limited to this. For example, as described below, encoded data of a frame generated when a special event occurs may be selected for the partial main material. This is because some failure may occur when an event occurs.
(1) Encoded data including a video signal generated immediately after the recording start button of the video recording apparatus 101 is pressed, that is, a video signal of the recording start frame.
(2) Encoded data including the video signal of the frame immediately before the recording end button is pressed, that is, the recording end frame.
(3) Encoded data including a part of data of a video signal of a recording frame (for example, encoded data including data of an area in which an important image may be included. Specifically, as shown in FIG. (Encoded data including data of the central region R of the entire image).
(4) Encoded data including a video signal of a frame generated immediately before switching the recording medium when a plurality of recording media are used as the recording medium 105 and continuous recording is possible while switching the plurality of recording media.
(5) Encoded data including a video signal of a frame generated immediately after switching of the recording medium when a plurality of recording media are used as the recording medium 105 and continuous recording is possible while switching the plurality of recording media.
(6) Encoded data including a video signal of a frame generated immediately before / after the file in which the encoded data is recorded is switched.
(7) Any combination of (1) to (6) above.

  In the above-described embodiment, the main recording material is selected and reproduced by the reproducing unit 106 immediately after the main recording material is recorded on the recording medium 105 in the video recording apparatus 101, but the data is compressed at a low compression rate by the low compression encoding unit 103. The main material may be directly selected and transmitted. However, in this case, only the operation of the low compression encoding unit 103 is confirmed, and the operation of the recording unit 104, the recording medium 105, and the reproduction unit 106 cannot be confirmed. Therefore, the main material is recorded as in the first embodiment. It is preferable to select / reproduce by the reproducing unit 106 immediately after recording on the medium 105.

  In FIG. 2, the start timing of the frame number 0 of the low-resolution material and the start timing of frame number 0 of the partial main material are shown to be synchronized. However, these timings need not be synchronized on the communication medium. For example, it may be shifted by a predetermined time, or may be further divided into a plurality of packets and multiplexed. In short, when received by the receiving unit 112 of the recording confirmation apparatus 120, the data of the low resolution material and the partial main material are separated so that the original low resolution material and the partial main material can be output within a predetermined time. As long as the data is multiplexed.

  In the embodiment described above, as a comparison method in the video comparison unit 115, the partial main video signal and the low resolution video signal having the same frame number (that is, the same recording time) are compared. It is not limited to. For example, when there is no frame having the same frame number, it may be compared with a frame having an adjacent frame number within a certain time difference.

  In the above-described embodiment, the information transmitted as the comparison result includes the determination result of the match / mismatch between the partial main video signal and the low-resolution video signal and the corresponding frame number. Ancillary information (time code etc.) of these video signals may also be included. For example, the file name of the main video signal and the recording start time may be included.

  In the above-described embodiment, the camera viewfinder is used as the comparison result notification unit 110, but the present invention is not limited to this. For example, the comparison result may be notified by video or audio via a liquid crystal monitor or audio monitor output attached to the video recording apparatus 101. Alternatively, the notification unit 110 may include a vibrating body arranged at a portion that contacts the cameraman's body, and may be notified by vibrating the vibrating body. Alternatively, the receiving unit 109 and the notification unit 110 in the video recording device 101 may be devices different from the video recording device 101 such as a mobile phone.

  Further, as shown in FIG. 6, in the transmission channel 200, a transmission band B1 for transmitting a low-resolution material and a transmission band B2 for transmitting a partial main material are secured in the transmission band B, and a video comparison signal is obtained in the remaining band B3. May be transmitted.

  The present invention can be widely applied to a video recording apparatus and a recording confirmation system for recording a video signal on an asynchronous recording medium such as a memory, an optical disk, or a hard disk.

The block diagram which shows the structure of the recording confirmation system of this invention Diagram illustrating multiplexed transmission of low-resolution material and partial main material The figure for demonstrating the comparison method of a low-resolution video signal and a partial main video signal The figure which shows the example of the display which shows the abnormality displayed on the viewfinder of the video recording apparatus The figure explaining a part of the frame selected as the frame for the partial main part material Diagram explaining multiplexed transmission of low resolution material and partial main material and comparison results

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Video recording apparatus 102 Imaging part 103 Low compression encoding part 104 Recording part 105 Recording medium 106 Playback part 107 High compression encoding part 108 Transmission part 109 Reception part 110 Notification part 112 Reception part 113 Low compression decoding part 114 High compression decoding Unit 115 video comparison unit 116 transmission unit 120 recording confirmation device

Claims (18)

Imaging means for photographing video; first encoding means for compressing a video signal imaged by the imaging means at a first compression rate and generating first encoded data;
Recording means for recording the first encoded data on a recording medium;
Reproducing means for reading the first encoded data from the recording medium and selecting a part according to a predetermined rule to generate partially encoded data;
Second encoding means for compressing the video signal imaged by the imaging means at a second compression rate higher than the first compression rate, and generating second encoded data;
Transmitting means for multiplexing and transmitting the partially encoded data generated by the reproducing means and the second encoded data generated by the second encoding means;
Receiving means for receiving a comparison result of comparing the partially encoded data and the second encoded data transmitted by the transmitting means;
A video recording apparatus comprising notification means for outputting the comparison result.   The video recording apparatus according to claim 1, wherein the first encoding unit has the first compression ratio of 1.   The video recording apparatus according to claim 1, wherein the reproduction unit selects encoded data including a video signal of a recording start frame from the first encoded data.   2. The video recording apparatus according to claim 1, wherein the reproduction unit selects encoded data including a video signal of a recording end frame from the first encoded data.   2. The video recording apparatus according to claim 1, wherein the reproduction unit selects encoded data including a video signal of a recording frame at a predetermined interval from the first encoded data.   2. The video recording apparatus according to claim 1, wherein the reproduction unit selects encoded data including a part of a video signal of a recording frame from the first encoded data.   When continuous recording on a plurality of recording media is possible, the reproducing means selects encoded data including a video signal of a recording frame immediately after switching of the recording medium from the first encoded data. The video recording apparatus according to claim 1.   When continuous recording on a plurality of recording media is possible, the reproducing means selects encoded data including a video signal of a recording frame immediately before switching of the recording medium from the first encoded data. The video recording apparatus according to claim 1.   The video recording apparatus according to claim 1, wherein the transmission unit further transmits the second encoded data and / or the auxiliary information of the partial encoded data.   The video recording apparatus according to claim 1, wherein the transmission unit allocates a band other than a band used for transmitting the second encoded data in a communication band to transmit the partially encoded data.   The video recording apparatus according to claim 1, wherein the notification unit displays a comparison result on a viewfinder attached to the video recording apparatus or a liquid crystal monitor.   The video recording apparatus according to claim 1, wherein the notification unit includes a vibrating body that vibrates the video recording apparatus.   The video recording apparatus according to claim 1, wherein the notification unit notifies a comparison result via an audio monitor output attached to the video recording apparatus. Receiving means for receiving the first encoded data and the second encoded data using a part of the transmission band;
First decoding means for decompressing the first encoded data received by the receiving means and generating a first video signal;
Second decoding means for decompressing the second encoded data received by the receiving means and generating a second video signal;
Comparing means for comparing the first video signal and the second video signal;
A recording confirmation apparatus comprising: a transmission unit that transmits a comparison result of the comparison unit.   15. The recording check apparatus according to claim 14, wherein the comparison unit compares the video signals of frames at the same time in the first video signal and the second video signal.   15. The recording confirmation apparatus according to claim 14, wherein the comparison unit compares the video signals of frames within a predetermined time difference between the first video signal and the second video signal.   The transmission means allocates a band other than the band used for transmitting the first encoded data and the second encoded data in the transmission band to the transmission of the comparison result. 14. A recording confirmation apparatus according to 14. A recording confirmation system for confirming a recording state of a shot image,
Including a video recording device for recording video, and a recording confirmation device for checking a recording state of the recorded video,
a) The video recording device
Imaging means for photographing video; first encoding means for compressing a video signal imaged by the imaging means at a first compression rate and generating first encoded data;
Recording means for recording the first encoded data on a recording medium;
Reproducing means for reading the first encoded data from the recording medium and selecting a part according to a predetermined rule to generate partially encoded data;
Second encoding means for compressing the video signal imaged by the imaging means at a second compression rate higher than the first compression rate, and generating second encoded data;
Transmitting means for multiplexing and transmitting the partially encoded data generated by the reproducing means and the second encoded data generated by the second encoding means;
Receiving means for receiving a comparison result of comparing the partially encoded data and the second encoded data transmitted by the transmitting means;
Notification means for outputting the comparison result,
b) The recording confirmation device
Receiving means for receiving the first encoded data and the second encoded data using a part of the transmission band;
First decoding means for decompressing the first encoded data received by the receiving means and generating a first video signal;
Second decoding means for decompressing the second encoded data received by the receiving means and generating a second video signal;
Comparing means for comparing the first video signal and the second video signal;
Transmission means for transmitting the comparison result of the comparison means,
Record confirmation system.

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