JP2021013064A - Recording device, recording method, and program - Google Patents

Abstract

To prevent a pre-recording time from being shortened.SOLUTION: A recording device includes: a compression/decompression circuit A and a compression/decompression circuit B that encode moving image data while making the moving image data different in phase with a reference structure having the same number of frames; and a buffer for pre-REC for temporarily holding the moving image data encoded by the compression/decompression circuit A and the moving image data encoded by the compression/decompression circuit B. When moving image data before a recording start instruction is accepted are recorded in response to the acceptance of the recording start instruction, any one of the moving image data encoded by the compression/decompression circuit A and the moving image data encoded by the compression/decompression circuit B is controlled to be recorded in a recording medium, whereby it is possible to prevent a pre-REC time from being shortened.SELECTED DRAWING: Figure 1

Description

The present invention relates to recording devices, recording methods, and programs.

Some imaging devices such as digital video cameras have a pre-recording (pre-REC, pre-recording) function that buffers video signals for a certain period of time before the recording start instruction so as not to miss a recording opportunity (for example, pre-recording). See Patent Document 1). When the user turns on the power of the image pickup device having a pre-REC function, the optical image formed through the lens optical system is converted into an electric signal by the image pickup element, and the image data (digital data) is a semiconductor memory or the like. It is sequentially stored in the buffer of. When the storage capacity of the buffer becomes full (full), the old image data is overwritten with the new image data, so that the old image data is sequentially erased, while the new image data is sequentially stored. Then, when the user of the imaging device instructs to start recording the image, the image data for a certain period of time before the recording start instruction and the image data after the recording start instruction stored in the buffer are stored in a storage medium such as an SD card. Is memorized in. After that, when the user of the imaging device instructs the end of recording the image, the storage process of the image data in the storage medium is completed, and the storage process of the image data in the buffer is restarted.

JP-A-2002-118822

A conventional image pickup apparatus having a pre-REC function has the following problems. In recent years, as a moving image compression method using motion compensation prediction coding, a method called Long GOP that compresses across a plurality of frames is used. Since the editing unit of the image data compressed by the Long GOP method is the GOP (Group Of Pictures) unit, the image data stored in the buffer by the pre-REC needs to be handled in the GOP unit. On the other hand, in the pre-REC buffering operation, when the storage capacity of the buffer becomes full, the old image data is sequentially overwritten with the new image data. Therefore, the GOP that is partially overwritten with the new image data cannot be used as the pre-REC data, and there is a problem that the pre-REC time is shortened depending on the overwriting state of the image data in the buffer.

The present invention has been made in view of such circumstances, and an object of the present invention is to prevent the pre-recording time from being shortened.

The recording apparatus according to the present invention has a first coding processing means that encodes moving image data with a reference structure having a predetermined number of frames, and a reference structure having the same number of frames as the first coding processing means. Differently, the second coding processing means for encoding the moving image data, the moving image data encoded by the first coding processing means, and the moving image data encoded by the second coding processing means are encoded. A holding means for temporarily holding the moving image data, and a first coding processing means for recording the moving image data before receiving the recording start instruction in response to receiving the recording start instruction. It has a control means for controlling to record the moving image data of either one of the moving image data encoded by the above-mentioned second coding processing means and the moving image data encoded by the second coding processing means in the storage means. It is characterized by that.

According to the present invention, it is possible to prevent the pre-recording time from being shortened.

It is a figure which shows the structural example of the image pickup apparatus which applied the recording apparatus in embodiment of this invention. It is a flowchart which shows the operation example of the image pickup apparatus in 1st Embodiment. It is a figure explaining the pre-REC function. It is a figure explaining the pre-REC operation in 1st Embodiment. It is a flowchart which shows the operation example of the image pickup apparatus in the 2nd Embodiment. It is a figure explaining the pre-REC operation in 2nd Embodiment. It is a flowchart which shows the operation example of the image pickup apparatus in 3rd Embodiment. It is a figure explaining the pre-REC operation in 3rd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First Embodiment)
The first embodiment of the present invention will be described.
FIG. 1 is a block diagram showing a configuration example of an image pickup apparatus 100 to which the recording apparatus according to the embodiment of the present invention is applied. The image pickup device 100 in the present embodiment includes a lens unit 101, a sensor (image sensor) 102, an image processing section 103, compression / expansion circuits 104, 105, 119, an on-screen display (OSD) section 106, and a display section 107. Further, the image pickup apparatus 100 includes a microcomputer (microcomputer) 108, an operation switch group 109, a ROM 110, a RAM 111, an SD card controllers 112 and 113, an external output unit 116, a bus 117, and a wireless module 118.

The lens unit 101 is a correction lens group having a function of correcting an image formation position moved by the movement of a fixed lens group, a variable magnification lens group, an aperture, and a variable magnification lens group for focusing, and a function of adjusting the focus. It is composed of. The lens unit 101 finally forms a subject image on the image plane of the sensor 102. The sensor 102 converts light into electric charges to generate an imaging signal. The image processing unit 103 performs a predetermined process on the image pickup signal input from the sensor 102 and outputs the image data to the RAM 111.

The compression / decompression circuits 104, 105, and 119 generate moving image data by MPEG compression (encoding) by performing coding processing such as motion compensation prediction coding on the image data stored in the RAM 111, and output the moving image data to the RAM 111. .. Further, the compression / expansion circuits 104, 105, and 119 also have a function (decoding) of inputting moving image data and decompressing the moving image data. The OSD unit 106 is for superimposing information such as various setting menus, titles, and times on digital image data. The OSD unit 106 also controls to output the superimposed image data or the like to the display unit 107 to display the image or the like. The display unit 107 is, for example, a liquid crystal panel, which is controlled by the OSD unit 106 to display an image or the like.

The microcomputer 108 controls the entire image pickup apparatus 100. The operation switch group 109 is for the user to input an operation. Further, the operation switch group 109 is also provided with a switch for selecting a camera mode for mainly performing camera shooting, a reproduction mode for mainly reproducing, and a power-off mode for turning off the power. Further, the operation switch group 109 is also provided with a switch for performing a pre-REC function and moving image recording. The ROM 110 stores a program or the like executed by the microcomputer 108. In addition, a part of the ROM 110 is used for holding the state of the system for backup. The RAM 111 is a volatile memory used as a work memory by the microcomputer 108, the image processing unit 103, the compression / decompression circuits 104, 105, 119, and the like.

The SD card controllers 112 and 113 are for recording the moving image data generated by the compression / decompression circuits 104, 105 and 119 and output to the RAM 111 on the SD cards 114 and 115. The SD card controllers 112 and 113 record moving image data on the SD cards 114 and 115 according to a computer-compatible format such as a FAT file system. The SD cards 114 and 115 are removable recording media that can be removed from the image pickup device 100, and can be attached to a personal computer or the like in addition to the image pickup device 100.

The external output unit 116 outputs the image data output to the RAM 111 by the image processing unit 103 to the outside. Each functional unit of the image pickup apparatus 100 is connected to the bus 117, and each functional unit exchanges data via the bus 117. The wireless module 118 transfers the moving image data stored in the RAM 111 to the outside by wireless communication such as WiFi (registered trademark) or Bluetooth (registered trademark). Further, although not shown in FIG. 1, the sound also has a microphone unit, a speaker, and the like, and the compression / decompression circuits 104, 105, and 119 perform compression / decompression of the sound data together with the image data. That is, audio data is also multiplexed with the above-mentioned moving image data.

The imaging device 100 shown in FIG. 1 is an example, and the present invention is not limited to this. For example, the SD card controller 113 and the compression / decompression circuit C119 may not be included in the first embodiment and the second embodiment described below, as long as they are included in at least the third embodiment. Good. Further, the compression / expansion circuits 104, 105 and 119 may be formed on different chips, or a part or all of the compression / expansion circuits 104, 105 and 119 may be formed on one chip. You may.

Next, the operation of the image pickup apparatus 100 in the first embodiment will be described. FIG. 2 is a flowchart showing an operation example of the image pickup apparatus 100 according to the first embodiment. Each process in the flowchart shown in FIG. 2 is realized by the microcomputer 108 of the image pickup apparatus 100 executing a program stored in the RAM 111. The image data is output from the image processing unit 103 to the RAM 111 each time the sensor 102 captures the image. The flowchart starts in this state.

In step S201, the microcomputer 108 determines whether or not the imaging device 100 is instructed to start the pre-REC operation. When the microcomputer 108 determines that the pre-REC start is instructed, the process proceeds to step S202.

Here, the pre-REC function will be described with reference to FIG. 3A to 3E are diagrams showing an example of the state transition of the buffer for pre-REC provided in the RAM 111. 3 (a) to 3 (e) show, as an example, a buffer 301 for pre-REC that temporarily holds moving image data generated by the compression / decompression circuit A104.

As shown in FIG. 3A, the buffer 301 for pre-REC is empty before the start of pre-REC.
When the operation switch group 109 is operated and the image pickup apparatus 100 is instructed to start the pre-REC, the moving image data 302 is held in the buffer 301 for the pre-REC on the RAM 111 as shown in FIG. 3 (b). To. The moving image data 302 is generated by compressing the image data output to the RAM 111 by the image processing unit 103 by controlling the compression / decompression circuit A104 by the microcomputer 108 to perform coding processing such as motion compensation prediction coding. .. Then, in the same manner, as shown in FIGS. 3 (c) and 3 (d), the moving image data 303 and 304 are written to the buffer 301 for pre-REC. Then, when the buffer 301 for the pre-REC becomes full, as shown in FIG. 3 (e), the moving image data 305 of the 4th GOP is pre-written so as to overwrite the moving image data 302 of the 1st GOP (Group Of Pictures). Write to buffer 301 for REC. After that, by sequentially updating the moving image data to be held in the same manner, the moving image data for a predetermined time is held in the buffer 301 for pre-REC.

For example, it is assumed that the image pickup apparatus 100 is instructed to start moving image recording via the operation switch group 109 at the time of the state shown in FIG. 3 (e). At this time, the moving image data 303 of the 2nd GOP to the moving image data 305 of the 4th GOP are written to the SD card A114 as the moving image data of the pre-REC via the SD card controller A112. The above is the description of the pre-REC function.

In step S202, the microcomputer 108 controls the compression / decompression circuit A104 to compress the image data output to the RAM 111 by the image processing unit 103, and the pre-REC for the compression / decompression circuit A104 on the RAM 111 is used as the moving image data for the pre-REC. Hold in the buffer.

In step S203, the microcomputer 108 determines whether or not the compression / decompression circuit A104 has compressed image data having half the GOP length. Here, the GOP length is the number of frames of the reference structure (GOP structure) of motion compensation prediction coding, that is, the length of the GOP indicating how many frames the GOP is composed of. For example, if the GOP length is 64. One GOP consists of 64 frames. Further, when the GOP length is 64, the image data of half the GOP length is compressed, which means that the compression / decompression circuit A104 compresses the image data of 32 frames, which is half the number of frames of 64 frames. Is. When the microcomputer 108 determines that the image data having half the GOP length has been compressed, the process proceeds to step S204.

In step S204, the microcomputer 108 controls the compression / decompression circuit B105 to compress the image data output to the RAM 111 by the image processing unit 103, and the pre-REC for the compression / decompression circuit B105 on the RAM 111 is used as the moving image data for the pre-REC. Hold in the buffer.

Here, the pre-REC buffer for the compression / expansion circuit A104 and the pre-REC buffer for the compression / expansion circuit B105 will be described with reference to FIG. 4A. It is assumed that the GOP length is 64 for both the moving image data of the compression / stretching circuit A104 and the moving image data of the compression / stretching circuit B105. The area 401 of the pre-REC buffer is secured on the RAM 111. In the pre-REC buffer, the area reserved in the RAM 111 is used like a ring buffer for buffering, and the moving image data to be held is sequentially updated. In FIG. 4, it is assumed that the left side is the oldest moving image data when the ring buffer is used and the right side is the latest moving image data when the ring buffer is used.

As an example shown in FIG. 4A, the buffer 402 for the pre-REC of the compression / expansion circuit A104 contains the moving image data 403 of the 30th to 63rd frames, which is less than 1 GOP, and the moving image data for 1 GOP. 404 is held. Further, the buffer 405 for the pre-REC of the compression / expansion circuit B105 is filled with the moving image data 406 of the 62nd to 63rd frames, which is less than 1 GOP, the moving image data 407 of 1 GOP, and 1 GOP to be added in the future. No moving image data 408 is retained. As shown in 409, the buffer 402 for the pre-REC of the compression / expansion circuit A104 and the buffer 405 for the pre-REC of the compression / expansion circuit B105 have a phase difference of 32 frames (half the GOP length) to provide moving image data. Is recorded. That is, the compression / expansion circuit A104 and the compression / expansion circuit B105 are different in phase by half the number of frames of the reference structure (GOP structure) in the motion compensation prediction coding, and the moving image data is motion compensation prediction coding.

In step S205, the microcomputer 108 determines whether or not the image pickup apparatus 100 has been instructed to start recording by operating the operation switch group 109. If the microcomputer 108 determines that the recording start instruction has been given, the process proceeds to step S206.

In step S206, the microcomputer 108 compares the pre-REC buffer of the compression / expansion circuit A104 with the pre-REC buffer of the compression / expansion circuit B105, and determines which has the longer pre-REC time. When the microcomputer 108 determines that the pre-REC time of the moving image data of the compression / decompression circuit A104 is longer, the process proceeds to step S207. If the microcomputer 108 determines that the pre-REC time of the moving image data of the compression / decompression circuit B105 is longer, the process proceeds to step S209.

Here, the comparison in step S206 will be described with reference to FIG. 4 (b). The states of the pre-REC buffer of the compression / expansion circuit A104 and the pre-REC buffer of the compression / expansion circuit B105 are the same as those described in FIG. 4A. The buffer 402 for pre-REC of the compression / decompression circuit A104 holds the moving image data 403 of the 30th to 63rd frames, which is less than 1 GOP, and the moving image data 404 for 1 GOP. Further, in the buffer 405 for the pre-REC of the compression / decompression circuit B105, the moving image data 406 of the 62nd to 63rd frames less than 1GOP, the moving image data 407 of 1GOP, and the moving image data less than 1GOP. 408 and are retained.

Since the moving image data 403 and 406 are data less than 1 GOP, the moving image data 403 and 406 are discarded as a discard frame. On the other hand, the moving image data 408 is also data that is less than 1 GOP, but will be added in future records to become 1 GOP data. Therefore, in the compression / expansion circuit A104, the moving image data 404 becomes the moving image data for the pre-REC, and in the compression / stretching circuit B105, the moving image data 407 and the moving image data 408 become the moving image data for the pre-REC. From the above, in the buffer state shown in FIG. 4, the number of effective frames in the moving image data held by the pre-REC buffer 405 of the compression / expansion circuit B105 is larger than that of the pre-REC buffer 402 of the compression / expansion circuit A104. Many (small number of discarded frames). Therefore, it is determined that the pre-REC time of the compression / expansion circuit B105 is longer than the pre-REC time of the compression / expansion circuit A104.

In step S207, the microcomputer 108 stops the operation of the compression / decompression circuit B105, and discards the moving image data held in the pre-REC buffer on the RAM 111 corresponding to the compression / decompression circuit B105. After that, the process proceeds to step S208.

In step S208, the microcomputer 108 controls the SD card controller A112 to write the moving image data held in the pre-REC buffer of the compression / decompression circuit A104 expanded on the RAM 111 to the SD card A114. Then, the compression / decompression circuit A104 is continuously operated to output the moving image data to the RAM 111. Then, the microcomputer 108 controls the SD card controller A112 and writes the moving image data in the SD card A114 so that the moving image data for the pre-REC is continuously recorded. And finish.

In step S209, the microcomputer 108 stops the operation of the compression / decompression circuit A104, and discards the moving image data held in the pre-REC buffer on the RAM 111 corresponding to the compression / decompression circuit A104. After that, the process proceeds to step S210.

In step S210, the microcomputer 108 controls the SD card controller A112 to write the moving image data held in the pre-REC buffer of the compression / decompression circuit B105 developed on the RAM 111 to the SD card A114. Then, the compression / decompression circuit B105 is continuously operated to output the moving image data to the RAM 111. Then, the microcomputer 108 controls the SD card controller A112 and writes the moving image data to the SD card A114 so that the moving image data for the pre-REC is continuously recorded. And finish.

In this way, the motion compensation prediction coding by the compression / expansion circuit A104 and the compression / expansion circuit B105 is performed by pre-REC so that the phases of the reference structure (GOP structure) are shifted by half the GOP length. Then, when the recording start instruction of the moving image data is received, the moving image data held by the pre-REC buffer for which the pre-REC time becomes longer is used as the moving image data of the pre-REC, and the other pre-REC buffer holds the moving image data. Discard the moving image data. This makes it possible to prevent the pre-REC time from being shortened when recording moving image data in the image pickup apparatus 100.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. Since the configuration of the imaging device in the second embodiment is the same as that of the imaging device 100 in the first embodiment, the description thereof will be omitted.

The operation of the image pickup apparatus 100 in the second embodiment will be described with reference to FIG. FIG. 5 is a flowchart showing an operation example of the image pickup apparatus 100 according to the second embodiment. In the first embodiment, the compression / decompression circuit B105 is operated regardless of the GOP length of the moving image data and the format of the pre-REC. However, for example, when the GOP length is short, there are few frames to be discarded. Therefore, there is an advantage that the number of frames to be discarded is reduced by operating the compression / expansion circuit B105 by shifting the phase by half of the GOP length with respect to the compression / expansion circuit A104. Is low. As will be described later, the same applies to the pre-REC format. Therefore, in the second embodiment, it is determined whether or not to operate the compression / expansion circuit B105 based on the GOP length and the pre-REC format.

In step S501, the microcomputer 108 determines whether or not the image pickup apparatus 100 is instructed to start the pre-REC operation. When the microcomputer 108 determines that the pre-REC start is instructed, the process proceeds to step S502.

In step S502, the microcomputer 108 controls the compression / decompression circuit A104 to compress the image data output to the RAM 111 by the image processing unit 103, and the pre-REC for the compression / decompression circuit A104 on the RAM 111 is used as the moving image data for the pre-REC. Hold in the buffer.

In step S503, the microcomputer 108 determines whether or not the GOP length (the number of frames of the reference structure) of the moving image data compressed by the compression / decompression circuit A104 is equal to or greater than a predetermined number of frames. When the microcomputer 108 determines that the GOP length of the moving image data compressed by the compression / decompression circuit A104 is equal to or greater than a predetermined number of frames, the process proceeds to step S504. On the other hand, when the microcomputer 108 determines that the GOP length of the moving image data compressed by the compression / decompression circuit A104 is not equal to or more than a predetermined number of frames, the process proceeds to step S505.

In step S504, the microcomputer 108 determines whether the pre-REC method is a fixed number of seconds method for a fixed time or a buffer full method for the storage capacity of the pre-REC buffer. If the microcomputer 108 determines that the buffer full method is used, the process proceeds to step S507, and if the microcomputer 108 determines that the method is a fixed number of seconds method, the process proceeds to step S505.

Here, the fixed number of seconds method and the buffer full method will be described with reference to FIG. Here, it will be described as moving image data of 1 GOP = 1 second. As shown in FIG. 6A, a buffer 601 for pre-REC of the compression / expansion circuit A104 is secured in the RAM 111. In the example shown in FIG. 6A, moving image data for 4 seconds is stored in 1 to 4 GOP.

The fixed number of seconds method is a pre-REC method that fixes the pre-REC time to several seconds. For example, in the state of the buffer 601 shown in FIG. 6 (a), when the number of seconds of the pre-REC is fixed at 3 seconds, as shown in 602 of FIG. 6 (b), 3 seconds of the 2nd to 4th GOP are set. It is treated as moving image data for pre-REC. On the other hand, the buffer full method is a method of recording all the buffers for pre-REC of the compression / expansion circuit A104 held in the RAM 111. For example, in the case of the state of the buffer 601 shown in FIG. 6A, the 1st to 4th GOPs and 4 seconds are treated as moving image data for pre-REC as shown in 603 of FIG. 6C.

In step S505, the microcomputer 108 determines whether or not the image pickup apparatus 100 has been instructed to start recording by operating the operation switch group 109. If the microcomputer 108 determines that the recording start instruction has been given, the process proceeds to step S506.

In step S506, the microcomputer 108 controls the SD card controller A112 to write the moving image data held in the pre-REC buffer of the compression / decompression circuit A104 developed on the RAM 111 to the SD card A114. Then, the compression / decompression circuit A104 is continuously operated to output the moving image data to the RAM 111. Then, the microcomputer 108 controls the SD card controller A112 and writes the moving image data in the SD card A114 so that the moving image data for the pre-REC is continuously recorded. And finish.

Since the processes of steps S507 to S514 are the same as the processes of steps S203 to S210 in the first embodiment shown in FIG. 2, the description thereof will be omitted.

As described above, according to the second embodiment, the pre-REC is performed by using both the compression / expansion circuit A104 and the compression / expansion circuit B105, or the compression / expansion circuit is performed, depending on the GOP length of the moving image data or the pre-REC method. It is switched whether to perform pre-REC only with A104. As a result, unnecessary operation of the compression / expansion circuit B105 can be suppressed, and power consumption and the like can be reduced.

(Third Embodiment)
Next, a third embodiment of the present invention will be described. Since the configuration of the image pickup apparatus in the third embodiment is the same as that of the image pickup apparatus 100 in the first embodiment, the description thereof will be omitted.

The operation of the image pickup apparatus 100 in the third embodiment will be described with reference to FIG. 7. FIG. 7 is a flowchart showing an operation example of the image pickup apparatus 100 according to the third embodiment. The third embodiment newly uses the compression / decompression circuit C119 with respect to the first embodiment to generate a proxy moving image of the compression / decompression circuit A104 or the compression / decompression circuit B105.

In step S701, the microcomputer 108 determines whether or not the image pickup apparatus 100 is instructed to start the pre-REC operation. When the microcomputer 108 determines that the pre-REC start is instructed, the process proceeds to step S702.

In step S702, the microcomputer 108 controls the compression / decompression circuit C119 to compress the image data output to the RAM 111 by the image processing unit 103, and the pre-REC for the compression / decompression circuit C119 on the RAM 111 is used as the moving image data for the pre-REC. Hold in the buffer. The compression / expansion circuit C119 may have a different coding method from the compression / expansion circuit A104 and the compression / expansion circuit B105, and may have different resolutions and GOP lengths of the generated moving image data.

In step S703, the microcomputer 108 controls the compression / decompression circuit A104 to compress the image data output to the RAM 111 by the image processing unit 103, and the pre-REC for the compression / decompression circuit A104 on the RAM 111 is used as the moving image data for the pre-REC. Hold in the buffer.

In step S704, the microcomputer 108 determines whether or not the compression / decompression circuit A104 has compressed image data having half the GOP length. When the microcomputer 108 determines that the image data having half the GOP length has been compressed, the process proceeds to step S705.

In step S705, the microcomputer 108 controls the compression / decompression circuit B105 to compress the image data output to the RAM 111 by the image processing unit 103, and the pre-REC for the compression / decompression circuit B105 on the RAM 111 is used as the moving image data for the pre-REC. Hold in the buffer.

In step S706, the microcomputer 108 determines whether or not the image pickup apparatus 100 has been instructed to start recording by operating the operation switch group 109. If the microcomputer 108 determines that the recording start instruction has been given, the process proceeds to step S707.

In step S707, the microcomputer 108 compares the pre-REC buffer of the compression / expansion circuit A104 with the pre-REC buffer of the compression / expansion circuit B105, and determines which is closer to the time of the pre-REC buffer of the compression / expansion circuit C119. To do. When the microcomputer 108 determines that the pre-REC time of the moving image data of the compression / expansion circuit A104 is closer to the pre-REC time of the compression / expansion circuit C119, the process proceeds to step S708. If the microcomputer 108 determines that the pre-REC time of the moving image data of the compression / expansion circuit B105 is closer to the pre-REC time of the compression / expansion circuit C119, the process proceeds to step S710.

Here, with reference to FIG. 8, a determination as to which is closer to the time of the pre-REC buffer of the compression / decompression circuit C119 will be described. FIG. 8 shows the state of the RAM 111 at a certain point in time. In FIG. 8, 801 is a buffer for pre-REC of the compression / expansion circuit A104, 802 is a buffer for pre-REC of the compression / expansion circuit B105, and 803 is a buffer for pre-REC of the compression / expansion circuit C119. As shown in the moving image data 805 of the compression / decompression circuit A104 and the moving image data 806 of the compression / decompression circuit B105, the GOP length of the compression / decompression circuit A104 and the compression / decompression circuit B105 is 64. Further, as shown in the moving image data 807 of the compression / expansion circuit C119, the GOP length of the compression / expansion circuit C119 is 48. Then, as shown in 804, the pre-REC buffer of the compression / expansion circuit A104 and the pre-REC buffer of the compression / expansion circuit B105 are deviated by half of the GOP length.

When the recording operation is performed in such a state, the effective frame as the pre-REC is the frame 808 in the pre-REC buffer of the compression / expansion circuit A104, and the frame 809 in the pre-REC buffer of the compression / expansion circuit B105. Further, in the pre-REC buffer of the compression / expansion circuit C119, the frame is 810. Comparing the buffers for pre-REC of the compression / expansion circuit A104 and the compression / expansion circuit B105, the effective frame range of the compression / expansion circuit A104 is closer to the effective frame range of the compression / expansion circuit C119. Therefore, in the buffer state shown in FIG. 8, the determination in step S707 is YES.

In step S708, the microcomputer 108 stops the operation of the compression / decompression circuit B105, and discards the moving image data held in the pre-REC buffer on the RAM 111 corresponding to the compression / decompression circuit B105. After that, the process proceeds to step S709.

In step S709, the microcomputer 108 controls the SD card controller A112 to write the moving image data held in the pre-REC buffer of the compression / decompression circuit A104 developed on the RAM 111 to the SD card A114. Then, the compression / decompression circuit A104 is continuously operated to output the moving image data to the RAM 111. Then, the microcomputer 108 controls the SD card controller A112 and writes the moving image data in the SD card A114 so that the moving image data for the pre-REC is continuously recorded. After that, the process proceeds to step S712.

In step S710, the microcomputer 108 stops the operation of the compression / decompression circuit A104, and discards the moving image data held in the pre-REC buffer on the RAM 111 corresponding to the compression / decompression circuit A104. After that, the process proceeds to step S711.

In step S711, the microcomputer 108 controls the SD card controller A112 to write the moving image data held in the pre-REC buffer of the compression / decompression circuit B105 developed on the RAM 111 to the SD card A114. Then, the compression / decompression circuit B105 is continuously operated to output the moving image data to the RAM 111. Then, the microcomputer 108 controls the SD card controller A112 and writes the moving image data to the SD card A114 so that the moving image data for the pre-REC is continuously recorded. After that, the process proceeds to step S712.

In step S712, the microcomputer 108 controls the SD card controller B113 to write the moving image data held in the pre-REC buffer of the compression / decompression circuit C119 expanded on the RAM 111 to the SD card B115. Then, the compression / decompression circuit C119 is continuously operated to output moving image data to the RAM 111. Then, the microcomputer 108 controls the SD card controller B113 to write the moving image data to the SD card B 115 so that the moving image data for pre-REC is continuously recorded. And finish.

In this way, when the proxy moving image is generated, the moving image data stored in the pre-REC buffer closer to the pre-REC buffer of the proxy moving image is recorded as the moving image data of the pre-REC. As a result, the length of the moving image data of the proxy moving image generated by the compression / decompression circuit C119 and the moving image data generated by the compression / decompression circuit A104 or the compression / decompression circuit B105 can be matched.

Although the embodiments of the present invention have been described above, the present invention is not limited to these specific embodiments, and various embodiments within the scope of the gist of the present invention are also included in the present invention. Some of the above-described embodiments may be combined as appropriate.

(Other Embodiments of the present invention)
The present invention supplies a program that realizes one or more functions of the above-described embodiment to a system or device via a network or storage medium, and one or more processors in the computer of the system or device reads and executes the program. It can also be realized by the processing to be performed. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

It should be noted that the above-described embodiments are merely examples of embodiment of the present invention, and the technical scope of the present invention should not be construed in a limited manner by these. That is, the present invention can be implemented in various forms without departing from the technical idea or its main features.

100: Imaging device 102: Sensor 103: Image processing unit 104, 105, 119: Compression / decompression circuit 108: Microcomputer 109: Operation switch group 110: ROM 111: RAM 112, 113: SD card controller 114, 115: SD card

Claims (18)

A first coding processing means for encoding moving image data with a reference structure having a predetermined number of frames,
A second coding processing means for encoding the moving image data by differentiating the phases with a reference structure having the same number of frames as the first coding processing means.
A holding means for temporarily holding the moving image data encoded by the first coding processing means and the moving image data encoded by the second coding processing means.
When recording the moving image data before receiving the recording start instruction in response to the reception of the recording start instruction, the moving image data encoded by the first coding processing means and the second coding are performed. A recording device including a control means for controlling to record moving image data of any one of moving image data encoded by the processing means in a storage means. The recording according to claim 1, wherein the control means controls to record moving image data for a predetermined time before receiving the recording start instruction in response to receiving the recording start instruction. apparatus. The holding means holds the first holding means for holding the moving image data encoded by the first coding processing means and the moving image data encoded by the second coding processing means. Including a second holding means
The first or second holding means according to claim 1, wherein each of the first holding means and the second holding means holds moving image data for a predetermined time before receiving the recording start instruction. Recording device. The control means is an effective one of the moving image data encoded by the first coding processing means and the moving image data encoded by the second coding processing means, which is held by the holding means. The recording device according to any one of claims 1 to 3, wherein the moving image data for a long time is controlled to be recorded in the storage means. The control means is a moving image held in the holding means among the moving image data encoded by the first coding processing means and the moving image data encoded by the second coding processing means. The recording device according to any one of claims 1 to 3, wherein the moving image data having many effective frames in the image data is controlled to be recorded in the storage means. The control means is a moving image held in the holding means among the moving image data encoded by the first coding processing means and the moving image data encoded by the second coding processing means. The recording device according to any one of claims 1 to 3, wherein the moving image data having few discarded frames in the image data is controlled to be recorded in the storage means. The control means is an effective one of the moving image data encoded by the first coding processing means and the moving image data encoded by the second coding processing means, which is held by the holding means. The recording device according to any one of claims 1 to 3, wherein the moving image data having a large number of GOPs (Group Of Pictures) is controlled to be recorded in the storage means. The second coding processing means encodes the moving image data with a phase difference of half the number of frames of the reference structure with respect to the first coding processing means. The recording device according to any one of claims 1 to 7. The control means is the said of the moving image data encoded by the first coding processing means and the moving image data encoded by the second coding processing means held in the holding means. The operation of the coding processing means in which the moving image data that is not recorded in the storage means is discarded and the moving image data is not recorded in the storage means among the first coding processing means and the second coding processing means. The recording device according to any one of claims 1 to 8, wherein the recording device is stopped. In response to the reception of the recording start instruction, the control means records the moving image data before receiving the recording start instruction in the storage means, and then the moving image data is recorded in the storage means. The claim is characterized in that the moving image data encoded by one of the coding processing means and the second coding processing means is controlled to be recorded in the storage means. Item 2. The recording apparatus according to any one of Items 1 to 9. The second coding processing means according to any one of claims 1 to 10, wherein the moving image data is encoded only when the number of frames of the reference structure is equal to or more than a predetermined number of frames. The recording device described. It has a first method of causing the holding means to hold moving image data for a certain period of time, and a second method of causing the holding means to hold moving image data corresponding to the storage capacity of the holding means.
The recording device according to any one of claims 1 to 11, wherein the second coding processing means encodes the moving image data only in the case of the second method. Further having a third coding processing means for encoding the moving image data by a coding method different from that of the first coding processing means and the second coding processing means.
The holding means temporarily holds the moving image data encoded by the third coding processing means.
When the control means records the moving image data before receiving the recording start instruction in response to receiving the recording start instruction, the control means obtains the moving image data encoded by the third coding processing means. Of the moving image data encoded by the first coding processing means and the moving image data encoded by the second coding processing means, the holding means is controlled so as to be recorded in the storage means. It is characterized in that the moving image data whose effective time of the moving image data is close to the moving image data encoded by the third coding processing means held in the above is controlled to be recorded in the storage means. The recording device according to any one of claims 1 to 12. The recording device according to claim 13, wherein the moving image data encoded by the third coding processing means is moving image data for generating a proxy moving image. The moving image data encoded by the third coding processing means includes the moving image data encoded by the first coding processing means and the second coding processing means, the resolution, and the reference structure. 13. The recording device according to claim 13, wherein at least one of the frames is different. In addition, it has an imaging means
Any one of claims 1 to 15, wherein the first coding processing means and the second coding processing means encode the same moving image data imaged by the imaging means, respectively. The recording device described in the section. A first coding processing step of encoding moving image data with a reference structure having a predetermined number of frames, and
A second coding processing step of encoding the moving image data by differentiating the phases with a reference structure having the same number of frames as the first coding processing step.
A holding step of temporarily holding the moving image data encoded in the first coding processing step and the moving image data encoded in the second coding processing step in the holding means.
When recording the moving image data before receiving the recording start instruction in response to the reception of the recording start instruction, the moving image data encoded in the first coding processing step and the second reference numeral are used. A recording method comprising a control step of controlling to record the moving image data of any one of the moving image data encoded in the conversion processing step in a storage means. On the computer
A first coding process step of encoding moving image data with a reference structure having a predetermined number of frames, and
A second coding processing step that encodes the moving image data by differentiating the phases with a reference structure having the same number of frames as the first coding processing step.
A holding step of temporarily holding the moving image data encoded in the first coding processing step and the moving image data encoded in the second coding processing step in the holding means.
When recording the moving image data before receiving the recording start instruction in response to the reception of the recording start instruction, the moving image data encoded in the first coding processing step and the second reference numeral are used. A program for executing a control step that controls to record moving image data of any one of the moving image data encoded in the conversion processing step in a storage means.

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