JP2014086814A - Image recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance convenience of reproduction time etc. by file division at a point of scene change.SOLUTION: After the start of digitalization of an analog image signal obtained from a magnetic tape and recording the result on a first image file, when the size of the first image file amounts to a reference size (such as 3.6 GB) set on the basis of the upper limit size 4GB of an FAT 32, the presence and absence of the point of scene change is monitored. At a timing when the point of scene change is detected (t[3]), recording of the image data into the first image file is finished and following image data is recorded in a second image file.

Description

  The present invention relates to an image recording apparatus.

  Until several years ago, video cameras that recorded video signals on magnetic tapes such as Hi8, DVC, and VHS-C were the mainstream, and many were popular. At present, however, video cameras that record images on a semiconductor memory or a magnetic disk have become mainstream, and magnetic tape video cameras have completely or almost disappeared from the store. For this reason, if the video camera used at the time of recording is broken, it is difficult to newly purchase a replacement device, and thus it is very difficult to reproduce the video recorded on the magnetic tape.

  Therefore, a product for converting the video recorded on the magnetic tape into a digital file has been developed and put on the market (for example, see Non-Patent Document 1 below). In this type of product, an analog video signal is digitized in the main body and then input to a personal computer, where it is converted into a digital file.

  A user who uses a product such as the above usually reproduces the video signal by continuously reproducing the video signal on a magnetic tape type video camera for one magnetic tape (for example, a magnetic tape of 60 minutes or 120 minutes). Enter in the product. As a result, one image file (moving image file) is basically created for one magnetic tape, but when the file size of the image file reaches a predetermined upper limit size, Then, file division (division of recorded image file) is performed. For example, in the FAT32 file system, the upper limit size is 4 GB. Therefore, for example, when image data corresponding to 6 GB is generated from one magnetic tape, the first image file storing the first 4 GB of image data and the second 2 GB storing the remaining 2 GB of image data. An image file will be created and recorded. Since the file division is executed regardless of the content of the video signal, as shown in FIG. 8, the image data of the common scene (for example, the captured image data of the athletic meet) across the 4 GB boundary is divided into separate image files. Will be recorded.

  Note that Patent Document 1 discloses a method of selecting and playing content that falls within the time from a plurality of contents when the viewer's viewable time is limited. It is shown that content division is performed using scene changes (see particularly [0006] and [0031]).

JP 2011-249940 A

I / O data, USB connection video capture catalog, “GV-USB2 / HQ”, [online], 2010, [searched on January 25, 2012], Internet <URL: http: //www.iodata. jp / product / av / capture / gv-usb2hq>

  When the image data of the common scene is divided and recorded (saved) into the first and second image files, the user feels inconvenience during reproduction. For example, when viewing the common scene, it is generally necessary to separately reproduce the second image file after the reproduction of the first image file, which is troublesome. In particular, when the first and second image files are stored separately on two media (for example, a DVD having a recording capacity of 4.7 GB), it is necessary to replace the media with the playback device. Also, in terms of user file management, it is not preferable that the common scene is recorded separately in separate image files.

  Accordingly, an object of the present invention is to provide an image recording apparatus that contributes to improvement in convenience during reproduction and the like.

  An image recording apparatus according to the present invention includes a data acquisition unit that acquires image data of a moving image, and a recording control unit that creates an image file on a recording medium and records the image data in the image file, The recording control unit determines whether or not there is a singular point on the time series of the moving image when the file size of the first image file reaches a predetermined reference size after the recording of the image data to the first image file is started. Monitoring, when the singular point is detected, ending recording of the image data in the first image file, and thereafter recording the image data in a second image file different from the first image file. It is characterized by.

  As a result, file division is performed with a singular point (for example, a scene change point) as a boundary, and an improvement in convenience during reproduction or the like is expected.

  Specifically, for example, the recording control unit may set the reference size based on the upper limit size of the image file defined on the recording medium.

  For example, the recording control unit detects the presence or absence of the singular point based on the image data of the moving image, and the singular point is detected as the file size of the first image file approaches the upper limit size from the reference size. You may loosen the judgment criteria for detecting that it exists.

  This promotes file division with a singularity as a boundary while suppressing excessive file division.

  More specifically, for example, the recording control unit detects the presence or absence of the singular point by comparing the amount of change of the feature amount of the moving image between frames with a predetermined determination threshold, and The determination criterion may be relaxed by changing the determination threshold as the file size approaches the upper limit size from the reference size.

  For example, the singular point includes a scene change point.

  According to the present invention, it is possible to provide an image recording apparatus that contributes to improvement in convenience during reproduction or the like.

It is a schematic whole block diagram of the electronic device which concerns on embodiment of this invention. It is a block diagram of the part in connection with recording of image data and sound data. It is a figure which shows the whole area of one moving image. It is a figure which shows the structure of an image file. It is a figure which shows the relationship between a series of analog video signals, the digital moving image based on it, and a scene change point. 6 is a flowchart of a recording operation of the electronic apparatus according to the embodiment of the invention. It is the figure which showed a mode that file division was performed by the scene change point as a boundary. It is a figure which shows the example of the file division | segmentation by a conventional product.

  Hereinafter, an example of an embodiment of the present invention will be specifically described with reference to the drawings. In each of the drawings to be referred to, the same part is denoted by the same reference numeral, and redundant description regarding the same part is omitted in principle. In this specification, for simplification of description, a symbol or reference that refers to information, signal, physical quantity, state quantity, member, or the like is written to indicate information, signal, physical quantity, state quantity or Names of members and the like may be omitted or abbreviated.

  FIG. 1 is a schematic overall block diagram of an electronic device 1 according to an embodiment of the present invention. The electronic device 1 is provided with each part referred by the codes | symbols 11-19.

  The input terminal 11 receives an analog video signal and an analog audio signal from an analog signal supply source (not shown). The input analog video signal to the input terminal 11 is an analog video signal according to an arbitrary standard (for example, the standard of the National Television System Committee), and the input analog audio signal to the input terminal 11 is to the input terminal 11. It is an analog audio signal synchronized with the input analog video signal. The analog signal supply source is, for example, a video camera capable of recording and playing back analog video signals and analog audio signals, or a playback device capable of playing back analog video signals and analog audio signals. The video signal and the analog audio signal are reproduced and supplied to the input terminal 11.

  The analog signal processing unit 12 executes an analog / digital conversion process for digitizing the input analog video signal and the input analog audio signal to the input terminal 11, thereby a digital video signal (RGB format or according to an arbitrary standard). YUV format video signal) and audio signal are generated. A digital video signal generated by the analog signal processing unit 12 is called digital image data or simply image data, and a digital acoustic signal generated by the analog signal processing unit 12 is called digital acoustic data or simply acoustic data. The analog signal processing unit 12 performs predetermined signal processing (for example, noise reduction processing, edge enhancement processing) other than analog / digital conversion processing in the process of generating digital image data and audio data from the input analog video signal and audio signal. You may make it do. For a certain moving image, both the analog video signal and the digital image data are a kind of moving image signal.

  The main control unit 13 comprehensively controls the operation of each part in the electronic device 1. The main control unit 13 can be formed by an integrated circuit. The main control unit 13 includes a CPU (Central Processing Unit) 31 that can execute various programs, and a compression processing unit that compresses digital image data and audio data in accordance with an arbitrary data compression standard such as MPEG (Moving Picture Experts Group). 32.

  The memory unit 14 includes, for example, a semiconductor memory, and includes a program memory that stores various programs executed by the CPU 31 and a data memory that temporarily stores arbitrary data generated and used by the main control unit 13. The display unit 15 is a display device having a display screen such as a liquid crystal display panel, and displays an arbitrary image under the control of the main control unit 13. The recording medium 16 is a non-volatile memory such as a semiconductor memory, an optical disk, a magnetic disk, or a magneto-optical disk, and records arbitrary data including image data under the control of the main control unit 13. The operation unit 17 receives input of various operations from the user. The operation content input to the operation unit 17 is transmitted to the main control unit 13. When a touch panel is provided on the display unit 15, the touch panel is included in the operation unit 17. The speaker unit 18 reproduces and outputs arbitrary acoustic data (for example, acoustic data recorded on the recording medium 16) as sound. The main control unit 13 can output arbitrary image data and sound data handled by the main control unit 13 to an external device (for example, a television receiver) of the electronic device 1 via the output terminal 19.

  FIG. 2 is a block diagram of a part related to recording of image data and sound data. The file creation unit 33 and the scene change detection unit 34 can be provided in the main control unit 13, and all or part of the functions of the creation unit 33 and the detection unit 34 can be realized by the CPU 31. The recording control unit 50 included in the main control unit 13 and connected to the recording medium 16 can be considered to include a processing unit 32, a creation unit 33, and a detection unit 34. One arbitrary moving image composed of a series of digital image data supplied from the analog signal processing unit 12 is referred to as a moving image MV (however, the moving image MV is an arbitrary one moving image formed from a series of input analog video signals. It is also a statue). The moving image MV is composed of a plurality of frame images (hereinafter also simply referred to as frames) arranged in a time series with a predetermined frame period. Since the moving image MV is accompanied by digital sound data (or analog sound signal), it is considered that the digital sound data (or analog sound signal) is also a component of the moving image MV. As shown in FIG. 3, the entire section on the time axis in which the image data of the moving image MV exists is referred to as all sections. The length of time between the start and end timings of all sections corresponds to the length of the moving image MV.

  The compression processing unit 32 compresses the digital image data and digital sound data of the moving image MV, and generates compressed image data and compressed sound data of the moving image MV.

  The file creation unit 33 creates an image file FL in the recording medium 16 and writes the compressed image data and compressed acoustic data of the moving image MV in the image file FL (in other words, storing, saving, and recording) The compressed image data and the compressed acoustic data of the image MV are recorded on the recording medium 16. FIG. 4 shows the structure of one image file FL. The image file FL is formed from a body area and a header area associated with each other, and compressed image data and compressed audio data of the moving image MV are stored in the body area. In the header area, additional information accompanying the moving image MV (file name of the image file FL, thumbnail image, etc.) is written.

  The scene change detection unit 34 detects a scene change point that is a singular point on the time series of the moving image MV based on the image data of the moving image MV. The process for performing this detection is called SC detection process. The moving image MV can be obtained by shooting one or more scenes (shooting scenery), and the scene change point is a point on the time series in which the scene (shooting scenery) changes in the moving image MV ( The point of time when a scene changes to another scene. Points on the time series may be considered as timing. Note that the start timing of the moving image MV is not a scene change point.

  In the present embodiment, in particular, the input analog video signal and the audio signal that are the source of the image data of the moving image MV are the analog video signal and the audio signal having a length of 120 minutes recorded on the magnetic tape, and It is assumed that the input analog video signal is generated by photographing with an analog video camera (not shown) and recorded on the magnetic tape. Then, one or more scene change points are often included in the moving image MV having a length of 120 minutes.

  FIG. 5 shows the relationship between the digital moving image MV and the 120-minute input analog video signal 310 that is the source of the digital moving image MV. The input analog video signal 310 is obtained by arranging the first to nth analog video signals obtained by photographing the first to nth scenes with the analog video camera in the first to nth periods in time series. (N is an integer of 2 or more). The (i + 1) period is a period after the i period, and the i scene is captured in the i period to obtain the i th analog video signal (i is an arbitrary integer). The first to nth scenes are different scenes (landscapes). Accordingly, the shooting scene (shooting scenery) changes at the boundary timing between the i-th and (i + 1) -th periods, and the scene change detection unit 34 analyzes the image data of the moving image MV and performs the above operation on the moving image MV. A scene change point is detected by detecting the boundary timing.

  On the time series of the moving image MV, the timing immediately after switching from the (i-1) th scene to the i-th scene is represented by the symbol t [i], and the section where the image data of the i-th scene exists is represented by the symbol A [ i]. Accordingly, when the variable i is an integer greater than or equal to 2 and less than or equal to (n−1), the section A [i] is the section from the timing t [i] to immediately before the timing t [i + 1]. The section A [1] is a section from the start timing of the moving image MV to immediately before the timing t [2], and the section A [n] is a section from the timing t [n] to the end timing of the moving image MV. is there. All sections of the moving image MV are formed by the sections A [1] to A [n]. The scene change detection unit 34 detects each scene change point on the time series of the moving image MV by the SC detection process for the moving image MV, and thereby the timing of each scene change point (that is, t [2] to t [n]). ) Is detected.

Various methods are known as a method for detecting a scene change point based on image data of a moving image, and the scene change detection unit 34 uses those known methods (for example, Japanese Patent Application Laid-Open Nos. 2003-283838 and 2002). The scene change point can be detected using a method described in Japanese Patent Application Laid-Open No. 2010-148053. For example, in the SC detection process, the detection unit 34 detects a scene change point (presence / absence of a scene change point) by comparing a change amount V _FT between frames of the feature amount of the moving image MV with a predetermined determination threshold TH. . At this time, the detection unit 34 determines that there is a scene change point if the change amount V _FT is equal to or greater than the determination threshold TH, and determines that there is no scene change point if the change amount V _FT is less than the determination threshold TH. Can do. In other words, the detection unit 34 regards each timing on the time series of the moving image MV as an attention timing, and when the amount of change V _FT equal to or greater than the determination threshold TH is observed at the attention timing, the attention timing is a scene change point. If it is determined that there is a change amount V _{FT at} the attention timing is less than the determination threshold TH, it is determined that the attention timing is not a scene change point.

  The feature amount of a certain frame depends on the change of the image between the frame and the immediately preceding frame, the spatial frequency component of the frame (in other words, edge information), color information or luminance information, or a combination thereof. Dependent. For example, the amount of encoded data that is compressed image data of the moving image MV (the amount of data in units of bit rate) may be used as the feature amount. The compression processing unit 32 divides each frame of the moving image MV into a plurality of blocks, and generates encoded data for each block by compressing the image data for each block. The amount of encoded data of the target block related to the target frame depends on the change in the image in the target block between the target frame and the frame immediately before the target frame, and the spatial frequency component in the target block in the target frame. The detection unit 34 counts the number of blocks in which the amount of change in the data amount of the encoded data is greater than or equal to the determination threshold TH at each timing of the moving image MV, and the counted number becomes equal to or greater than a predetermined value. Can be detected as a scene change point (when such detection is performed, the detection unit 34 operates in conjunction with the compression processing unit 32).

  Incidentally, the file size of the image file FL that can be recorded on the recording medium 16 has an upper limit. The predetermined upper limit size LIM that is the upper limit value depends on the file system employed in the electronic device 1 and the recording medium 16. The file system employed in the electronic device 1 and the recording medium 16 is arbitrary, and therefore the upper limit size LIM also varies depending on the employed file system. Here, in the electronic device 1 and the recording medium 16, FAT (File Allocation Table) is used. It is assumed that 32 file systems are employed and the upper limit size LIM is 4.0 GB (gigabytes).

  FIG. 6 is a flowchart of the recording operation in the electronic apparatus 1. With reference to FIG. 6, the flow of the recording operation will be described. In the description of FIG. 6, image data and sound data refer to image data and sound data of the moving image MV. When i and j are arbitrary integers different from each other, the i-th image file and the j-th image file are different image files.

  First, in step S11, supply of the input analog video signal 310 and the input analog audio signal to the input terminal 11 is started, and generation of image data and audio data based on the input analog video signal 310 and the input analog audio signal is started. . At this time, the initial value 1 is substituted into the variable j in step S12. Thereafter, the file creation unit 33 creates a j-th image file in the recording medium 16 in step S13, and starts recording (storing) compressed image data and compressed acoustic data in the j-th image file in subsequent step S14. .

  Subsequently, the file creation unit 33 monitors the file size SZ [j] of the j-th image file while confirming whether or not a predetermined recording end operation has been input to the operation unit 17 in steps S15 and S16. When the file size SZ [j] reaches a predetermined reference size REF, a transition from step S16 to step S21 is generated. If a recording end operation is input to the operation unit 17 before the file size SZ [j] reaches the reference size REF, the j-th image file is closed and the recording operation in FIG. 6 is ended. By the closing process of the jth image file, the recording of the compressed image data and the compressed sound data to the jth image file is finished, and the access to the jth image file by the file creation unit 33 is finished.

  The recording control unit 50 sets a file size (for example, 3.6 GB) smaller than the upper limit size LIM as the reference size REF based on the upper limit size LIM of the image file. For example, the recording control unit 50 sets a size smaller than the upper limit size LIM by a predetermined amount as the reference size REF, or sets k times the upper limit size LIM as the reference size REF (k satisfies 0 <k <1). Any coefficient to meet).

  In step S21, the file creation unit 33 starts SC presence / absence monitoring, which is processing for monitoring the presence / absence of a scene change point, using the result of the SC detection processing of the scene change detection unit 34. In step S22 and S23 after the start of the SC presence / absence monitoring, the file creation unit 33 checks whether or not a scene change point is detected by the SC detection process, while the file size SZ [j] reaches the upper limit size LIM. Confirm whether or not. When a scene change point is detected after the start of SC presence monitoring or when the file size SZ [j] reaches the upper limit size LIM, a transition from step S22 or S23 to step S26 occurs. It returns to step S13 through the process of S26 and S27.

  In step S26, the file creation unit 33 ends the recording of the compressed image data and the compressed acoustic data in the jth image file by performing the closing process of the jth image file. In the subsequent step S27, 1 is added to the variable j, and then the process returns to step S13.

  In step S22 and S23, when the scene change point is not detected and the file size SZ [j] has not reached the upper limit size LIM, the process proceeds to step S25 via the determination threshold value adjustment process in step S24. In step S25, the file creation unit 33 confirms whether or not a predetermined recording end operation has been input to the operation unit 17, and if the input of the recording end operation to the operation unit 17 is confirmed, the jth image The file closing process is performed, and the recording operation of FIG. If the input is not confirmed, a transition from step S25 to step S22 occurs, and the above-described step S22 and subsequent processing are repeated.

The determination threshold TH for distinguishing the presence / absence of a scene change point has an initial value TH _INIT at the start of SC presence / absence monitoring (TH _INIT > 0). In the determination threshold value adjustment process in step S24, the recording control unit 50 (the file creation unit 33 or the threshold adjustment unit in the recording control unit 50) determines as the file size SZ [j] approaches the upper limit size LIM from the reference size REF. The threshold value TH is gradually decreased from the initial value TH _INIT . When the determination threshold TH becomes small, the criterion for detecting that there is a scene change point (that is, a condition necessary for determining that there is a scene change point) becomes loose, and it is easy to detect if there is a scene change point. Become. When returning from step S27 to step S13, the SC presence / absence monitoring started in step S21 is once ended, and the determination threshold TH is returned to the initial value TH _INIT .

  A specific example is considered by applying it to the recording operation of FIG. Reference is also made to FIG. Now, the data amounts of the compressed image data and the compressed acoustic data in the section A [1] of the moving image MV, the data amounts of the compressed image data and the compressed acoustic data in the section A [2] of the moving image MV, and the section A of the moving image MV. Consider the case where the data amounts of the compressed image data and the compressed acoustic data in [3] are 2.5 GB, 1.2 GB, and 1.5 GB, respectively, and the reference size REF is 3.6 GB.

  Then, after the recording of the compressed image data and the compressed acoustic data with respect to the first image file is started, the first operation is performed while the compressed image data and the compressed acoustic data in the section A [2] are recorded in the first image file. Since the file size SZ [1] of the image file reaches 3.6 GB, which is the reference size REF, SC presence / absence monitoring is started at that time (step S21). Thereafter, a scene change point corresponding to the timing t [3] is detected by the SC detection process at a portion where the section of the image data is switched from the section A [2] to the section A [3] (Y in step S22). The file size SZ [1] when this detection is performed is 3.7 GB from “2.5 + 1.2 = 3.7”. The file creation unit 33 ends the recording of the compressed image data and the compressed sound data included in the first image file at the scene change point corresponding to the timing t [3] (step S26), and the compressed image after the scene change point. Data and compressed acoustic data are recorded in a second image file different from the first image file (steps S27, S13, and S14).

  If the total amount of compressed image data and compressed acoustic data in the sections A [3] to A [n] is equal to or smaller than the reference size REF, the compressed image data and compressed acoustic data in the sections A [3] to A [n] Recording is performed on the second image file, and the recording operation of FIG. 6 is completed (see FIG. 7). Otherwise, when the file size SZ [2] of the second image file reaches the reference size REF, the SC presence monitoring is started again (step S21), and the same processing as described above is performed on the second image file. Done. As a result, the compressed image data and the compressed acoustic data in the sections A [3] to A [n] are divided and recorded into two or more image files including the second image file (for example, the sections A [3] to A [N-1] compressed image data and compressed acoustic data are recorded in the second image file, and compressed image data and compressed acoustic data in the section A [n] are recorded in the third image file).

  According to this embodiment, it is avoided that the image data of the common scene is recorded (saved) separately in separate image files. That is, the scene and the image file coincide with each other, and the convenience during reproduction and the like is improved (the advantage is in comparison with the case where the common scene is divided into separate image files as shown in FIG. 8). If the scene and image file match, file management is easy.

  When the difference between the file size SZ [j] and the upper limit size LIM is large after the start of the SC presence / absence monitoring, the criteria for detecting that there is a scene change point (hereinafter referred to as the SC presence criteria) is relaxed. The possibility of file division is increased even though no scene change has occurred, which is undesirable (unnecessary file division leads to an increase in the number of files and file management becomes complicated). Therefore, when the difference size is large, it is better to set the SC presence criterion relatively high.

  On the other hand, if the SC presence criterion is kept high when the difference size becomes small, the possibility of missing a scene change increases, and the possibility of losing the opportunity for file division increases. If the criteria for determining whether or not the SC is relaxed, there is a higher possibility that a file other than the true scene change point will be erroneously detected as a scene change point and the file will be divided. Since it is necessary to divide the file, even if the SC determination criterion is relaxed when the difference size becomes small, there are few harmful effects.

  Considering these, the determination threshold value adjustment process in step S25 is provided, and the process promotes file division at the scene change point while suppressing excessive file division. However, the determination threshold value adjustment process in step S25 can be omitted. In this case, the determination threshold TH may be fixed to a constant value.

<< Deformation, etc. >>
The embodiment of the present invention can be appropriately modified in various ways within the scope of the technical idea shown in the claims. The above embodiment is merely an example of the embodiment of the present invention, and the meaning of the term of the present invention or each constituent element is not limited to that described in the above embodiment. The specific numerical values shown in the above description are merely examples, and as a matter of course, they can be changed to various numerical values. As annotations applicable to the above-described embodiment, notes 1 to 5 are described below. The contents described in each comment can be arbitrarily combined as long as there is no contradiction.

[Note 1]
The electronic device 1 may be further provided with functions other than the functions described above. For example, the electronic device 1 may be provided with a shooting function. In this case, an imaging unit that has a solid-state imaging device such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor) image sensor and generates an image signal of a subject by shooting is an electronic device 1 that can also be called an imaging device. Provided. It may be considered that the moving image captured by the imaging unit corresponds to the above-described moving image MV. When the image signal of the subject output from the imaging unit is an analog signal (analog video signal), the output image signal of the imaging unit is provided to the analog signal processing unit 12, so that the moving image MV as a captured moving image of the imaging unit. Image data is generated.

  Even when the image signal of the subject output from the imaging unit is a digital signal, the output image signal of the imaging unit can be input to the signal processing unit 12. In this case, naturally, the signal processing unit 12 does not need to digitize the input image signal, and the signal processing unit 12 performs predetermined signal processing (for example, signal amplification, demosaicing processing) other than analog / digital conversion processing. , Noise reduction processing, edge enhancement processing) is performed on the output image signal (output digital image signal) of the imaging unit, and the image signal (output image signal of the imaging unit that has undergone signal processing) obtained thereby is converted into an image of the moving image MV. Output as data.

[Note 2]
In the above-described embodiment, compressed image data and compressed acoustic data, which are compressed image data and acoustic data, are recorded on the recording medium 16 (image file). However, the image data and the acoustic data are compressed. Alternatively, it may be recorded on the recording medium 16 (image file).

[Note 3]
Input of the analog sound signal to the input terminal 11, digitization of the analog sound signal by the analog signal processing unit 12, and recording of sound data such as compressed sound data may be omitted.

[Note 4]
For example, it can be considered as follows. The electronic device 1 can also be called an image recording device (or an image conversion recording device). Alternatively, the electronic apparatus 1 includes an image recording device (or image conversion recording device). The components of the image recording apparatus (or image conversion recording apparatus) include the signal processing unit 12 and the recording control unit 50, and may further include the input terminal 11 and / or the recording medium 16. The signal processing unit 12 functions as a data acquisition unit that acquires image data of the moving image MV through the analog / digital conversion process or without the analog / digital conversion process (see Note 1).

[Note 5]
The target device which is the electronic device 1 or the image recording device can be configured by hardware or a combination of hardware and software. Arbitrary specific functions that are all or part of the functions realized by the target device are described as a program, the program is stored in the memory unit 14, and the program is stored on the program execution device (for example, CPU 31). The specific function may be realized by executing the above. The program can be stored and fixed on an arbitrary recording medium. The recording medium for storing and fixing the program may be mounted or connected to a device (such as a server device) different from the target device.

DESCRIPTION OF SYMBOLS 1 Electronic device 12 Analog signal processing part 16 Recording medium 50 Recording control part

Claims (5)

A data acquisition unit for acquiring image data of a moving image;
A recording control unit that creates an image file on a recording medium and records the image data in the image file;
When the file size of the first image file reaches a predetermined reference size after the start of recording of the image data in the first image file, the recording control unit determines whether or not there is a singular point on the time series of the moving image When the singular point is detected, the recording of the image data in the first image file is terminated, and thereafter the image data is recorded in a second image file different from the first image file. An image recording apparatus. The image recording apparatus according to claim 1, wherein the recording control unit sets the reference size based on an upper limit size of an image file defined on the recording medium. The recording control unit detects the presence or absence of the singular point based on the image data of the moving image, and detects that the singular point is present as the file size of the first image file approaches the upper limit size from the reference size. The image recording apparatus according to claim 2, wherein a criterion for determination is relaxed. The recording control unit detects the presence or absence of the singular point by comparing the amount of change of the feature amount of the moving image between frames with a predetermined determination threshold, and the file size of the first image file is determined from the reference size The image recording apparatus according to claim 3, wherein the determination criterion is relaxed by changing the determination threshold as the upper limit size is approached. The image recording apparatus according to claim 1, wherein the singular point includes a scene change point.

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