JP5000581B2 - Image playback device - Google Patents

Description

The present invention relates to an image reproducing equipment for controlling the image reproduction.

  In recent digital camera devices, the number of pixels of a CCD or the like has been increased, and the file size of a photographed image has been increasing. In connection with this, since it takes time to read large image file data, there is a problem that the reproduction and display of the image becomes slow.

In view of this, Patent Document 1 discloses an image reproduction apparatus that reduces the waiting time for reproduction and display, and allows a user to quickly confirm the reproduction image. In this image reproduction apparatus, image file data is simultaneously read by time-division access. In addition, a description is given of a process for simultaneously expanding and displaying. This process enables a plurality of people to view a plurality of separate images at the same time.
JP-A-2005-080219

  Since it is necessary to read a plurality of files at the same time, the processing becomes more complicated as the number of files increases, and more CPU power is required to perform this processing. The same applies to the case where the decompression process is operated simultaneously. When the number of image files exceeding the decompression processing capacity increases, there is a problem that the display speed is slowed down.

The present invention is directed to solving the problems of the prior art, and after reading the first image file, the read data is expanded and displayed. Since the reading of the second image file is completed when the first data decompression is completed, the second data decompression process is continued. can therefore read a plurality of image files at a high speed, and an object thereof is to provide an image reproducing equipment capable of displaying and stretching.

In order to achieve the above object, an image reproducing apparatus according to claim 1 of the present invention includes reading means for reading a compressed image file into a memory, and decompressing data of the image file read into the memory. Decompression means, control means for controlling the reading means and decompression means, confirmation means for confirming the presence or absence of an instruction to cancel the processing during continuous processing controlled by the control means, and decompression by the decompression means. Display means for reproducing and displaying thumbnail images of a plurality of frames as a list on a display unit, and the control means transmits a thumbnail read request to the reading means upon receiving an instruction to display a list of thumbnail images for reproduction. The reading means reads the image header portion of the image file specified by the received thumbnail read request into a memory, and reads the image header. When the reading of the portion is completed, a thumbnail read completion notification is transmitted to the control means. When the control means receives the thumbnail read completion notification, the decompression means extracts the thumbnail image extracted from the read image header portion. Further, the control means performs a reading process by the reading means and a decompression process by the decompressing means in parallel, and reads a plurality of image files by the reading means and the decompressing means. The decompression process is controlled so as to be continuously performed . Further, upon receiving an instruction to display and reproduce the plurality of frames, the control unit collectively creates the thumbnail read requests for the plurality of frames and reads the read Continuously sending thumbnail read requests for the plurality of frames to the means, and the reading means The thumbnail read completion notification is transmitted every time reading of the image header portion of the image file for one frame is completed based on the thumbnail read request, and the control means confirms the cancel instruction by the confirmation means. It is characterized by controlling to stop and stop the continuous processing .

  With this configuration, it is possible to read and decompress a plurality of image files at high speed.

According to a second aspect of the present invention, in the image reproducing apparatus according to the first aspect, when the confirmation unit confirms that the cancel instruction is present, the reading unit performs the image header portion after the confirmation is performed. The thumbnail read completion notification is transmitted without reading . According to a third aspect of the present invention, in the image reproduction device according to the first or second aspect, the thumbnail read request is a number of the plurality of frames and an image number N (N: 1 to the number of the plurality of frames). And the reading means compares the number of the plurality of frames in the processed thumbnail read request with the image number to determine whether or not the reading of the image header portion for the plurality of frames has been completed. It is characterized by determining.

Further, the invention described in claim 4, the image reproducing apparatus according to claim 1 to 3, before Symbol control means, a display by the display means and read by said reading means is performed in parallel, and said reading means Control is performed such that processing of reading, decompressing, and displaying a plurality of image files by the decompressing means and the display means is continuously performed.

  With this configuration, it is possible to perform a process of reading a plurality of image files at a high speed, decompressing them, and displaying them.

  According to the present invention, it is possible to perform parallel processing of reading a plurality of image files at a high speed, expanding and displaying them, and performing a high speed reproduction process even if the number of image files to be processed increases. There is an effect.

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

  FIG. 1 is a block diagram showing a digital camera device according to an embodiment of the present invention. A digital camera device shown in FIG. 1 includes a lens 101, a mechanical mechanism 102 including autofocus, a CCD 103, a CDS circuit 104, an A / D converter 105, a digital signal processing circuit 106, a compression / expansion circuit 107, a DRAM 108, and a memory card 109. LCD 110, driver 111, SG 112, CPU 113, operation unit 114, strobe 115, microphone 116, AMP / FILTER 117, D / A converter 118, audio data compression / decompression circuit 119, A / D converter 120, AMP / FILTER 121, An OSD (On Screen Display) 122, a DC / DC converter 125 as a power supply unit, a battery 126, an AC adapter 127, and the like are included. The CPU 113 has a RAM 123 and is connected to various components via a CPU bus 124.

  The lens unit includes a lens 101, a mechanical mechanism 102 including an autofocus (AF) / aperture / filter unit, and the like. A mechanical shutter of the mechanical mechanism 102 performs simultaneous exposure of two fields. A CCD (charge coupled device) 103 converts an image input via the lens unit into an electrical signal (analog image data). A CDS (correlated double sampling) circuit 104 reduces the noise of the electrical signal output from the CCD 103. The A / D converter 105 converts analog image data input from the CCD 103 via the CDS circuit 104 into digital image data. That is, the output signal of the CCD 103 is converted into a digital signal by the A / D converter 105 through the CDS circuit 104 at an optimum sampling frequency (for example, an integer multiple of the subcarrier frequency of the NTSC signal).

  The digital signal processing unit 106 divides the image data input from the A / D converter 105 into luminance data and color difference data, and performs data processing for various processing, correction, and image compression / decompression. The image compression / decompression circuit 107 conforms to JPEG, and compresses image data by orthogonal transform and Huffman coding. The image compression / decompression circuit 107 decompresses the image data by performing Huffman decoding / inverse orthogonal transform.

  On the other hand, the audio is converted into an electric signal by an audio-electric signal conversion element such as the microphone 116 to become audio data, amplified by the AMP / FILTER 117 and cut off to a necessary band, and then a predetermined band by the D / A converter 118. It is converted into digital audio data at a sampling frequency that is at least twice the sampling frequency. Further, this digital audio data is compressed and encoded by an audio data compression / decompression circuit 119.

  The DRAM 108 temporarily stores the compressed image data. The compressed image data is recorded in the memory card 109 as image file data, and the compressed audio data is recorded as audio file data.

  Also, an image corresponding to the image data recorded on the memory card 109 is displayed on the LCD 110 of the display means. In addition, the LCD 110 displays a set state of the digital camera device, for example, a set mode display or an error display.

  The operation unit 114 includes operation keys for externally performing function selection, shooting instruction, and other various settings. As operation keys, for example, “page feed” key and “page return” key for instructing page feed and page return of the image data stored in the memory card 109, the state of the set digital camera device, etc. There is a “display ON / OFF” key for instructing ON / OFF of the display.

  The CPU 113 controls the operation of each unit of the digital camera device according to a control program stored in a ROM (not shown) in response to an instruction from the operation unit 114 or an external operation instruction such as a remote controller (not shown). For example, the CPU 113 controls the recording operation of image data and audio data to the memory card 109, the playback operation of image data and audio data recorded on the memory card 109, and the like.

  As shown in FIG. 1, the power supply unit has a configuration in which a battery 126 and an AC adapter 127 are connected to a DC / DC converter 125.

  FIG. 2 is a diagram showing an example of the format of the memory card. This format is the same as the DOS format for personal computers. As shown in FIG. 2, the memory card 109 in FIG. 1 includes an attribute area 201 in which card attribute information such as device type, access speed, and storage capacity is stored, a boot selector area 202, a FAT area 203, and a directory entry area. 204, an image file data storage area 205 for storing image file data, and an audio file data storage area 206 for storing audio file data.

  In the boot selector area 202, parameters necessary for reading and writing data from the memory card 109, that is, FAT (File Allocation Table) entries, directories, and the like are recorded.

  In the FAT area 203, a FAT entry, which is information indicating a state in which data of each file is recorded, is written. The position on the memory where the data is recorded is indicated by a cluster number which is the number of the data writing unit.

  FIG. 3 is a diagram showing an example of the data structure stored in the directory entry area. In the directory entry area 204, as shown in FIG. 3, the file name of the recorded data, file attributes, reserved area, creation / update time, creation / update date, physical location of the corresponding file or subdirectory entry (FAT start) Number) and information about the size of the file. As the file name, when the corresponding data is file data, a file name including an extension which is one of the attribute information of the file is recorded.

  Further, the configuration of the image file data storage area 205 is as shown in FIG. 4, and each image file data (for example, RIMG0001.JPG, RIMG0002.JPG, RIMG0003.JPG, RIMG0004.JPG,...) Is sequentially fixed length. It is written with data. As shown in FIG. 4, the image file data includes an image header, main image data, and thumbnail images corresponding to the image data. In the image header, a file attribute, an individual standard name, a standard version, related information of the image data main body, related information of the thumbnail image, a recording mode, and the like are recorded.

  Next, the operation of this embodiment will be described. FIG. 5 is a diagram showing an example of a list of 20 reduced images. A plurality of images stored in the memory card 109 are displayed on the display device (LCD 110) at a time. If the number of images is 20, it will fit in the display of one page, if it is 40 frames, it will display 2 pages and 3 pages in 60 frames.

  FIG. 6 is a diagram showing a reproduction signal sequence when the present invention is not carried out. As shown in FIG. 6, a read process for reading an image file and an expansion / display process for expanding the read data and displaying it as image data are alternately performed. FIG. 7 is a diagram showing an example of a reproduction signal sequence of the present embodiment. If there is an instruction to request N (20) frame playback, the playback task issues a 20-frame read request to the file task. In the file task, read processing is sequentially performed according to the request, and the result is notified to the reproduction task as a read completion notification. In the reproduction task, the expansion process is performed according to the read completion notification, and the display process is continued after the expansion is completed.

  As the display position at this time, for example, as shown in FIG. As shown in the example of FIG. 7, the read process and the expansion / display process can be operated continuously without a break. As shown in the operation sequence diagram of FIG. 8, while the read process 2a is being performed on the second image file, the decompression process 1b of the first image file read in the previous read process 1a and the display of the first image are performed. The process 1c is operating. Next, while the read process 3a is performed on the file of the third image, the decompression process 2b and the display process 2c of the immediately preceding second image are performed.

  In this way, the continuous processing of displaying the number of image files instructed by the reproduction request on the LCD 110 in FIG. 5 is performed. For example, when the instructed number is 100 frames and the displayable number is 20, As described above, the LCD 110 is repeatedly subjected to continuous processing in a plurality of times (five times). The number of 20 frames that can be displayed can be arbitrarily changed.

  FIG. 9 is a flowchart showing N (20) frame playback request processing in the playback task of this embodiment, and FIG. 10 is a diagram showing an example of the structure of a notification message exchanged between tasks. The 20-frame playback request process will be described based on FIG. 9 with reference to FIGS.

  As shown in FIG. 9, in the playback task, when a “20-frame playback request” (see FIGS. 7 and 10C) from the application is received (S1), the number of frames is initialized (S2, S3). A message of “thumbnail read request” (see FIG. 10A) for 20 frames is created. For example, as a thumbnail read request for “total number of images: 20 frames”, N = 1 to 20 of “image number” is counted and N = 20 is confirmed. Request "is transmitted to the file task (S4, S5, S6).

  FIG. 11 is a flowchart showing thumbnail read completion notification processing in the file task of this embodiment. The thumbnail read completion notification process will be described based on FIG. 11 with reference to FIGS.

  As shown in FIG. 11, in the file task, when a “thumbnail read request” is received from the reproduction task (S11), it is always checked whether an instruction to cancel the processing has been issued (S12). When there is a cancellation (Yes in S12), a cancellation detection number (for example, “−10”, etc.) is set in the “read result” of “thumbnail read completion notification” (see FIG. 10B), and the playback task is set. Transmit (S13).

  When there is no cancellation (No in S12), the image header (see FIG. 4) portion of the designated image file data is read, and a thumbnail image is extracted (S14). When the reading of the header portion is completed (S15), the “read result” of “thumbnail read completion notification” is set to normal (eg, “0”) and transmitted to the reproduction task (S16).

  In the example of “thumbnail read request” shown in FIG. 10A, since the “image number” being processed and the “total number of images” are specified, it is determined whether or not the processing of all image files has been completed. (S17). Here, the “total number of images” is 20 frames, and when a “thumbnail read request” having “image number” having the same number is received (Yes in S17), the processing ends. If the read of the image file remains, the process continues to wait for a “thumbnail read request” (S18). When the “thumbnail read request” is received (Yes in S18), the process returns to step S12 again to repeat the process.

  In the processing S12 described above, the processing cancellation instruction is confirmed because the thumbnail read request for 20 frames is received collectively in the example of this embodiment, and when the cancellation instruction is confirmed, the read is thereafter performed. Instead, it is necessary to return a “thumbnail read completion notification”.

  Specifically, when the cancel instruction is confirmed, a cancel flag or the like is set, the subsequent reading is stopped, and a “thumbnail read completion notification” cancel notification in which the cancel detection number is set in step S13 is returned. Become. Further, when the cancel notification described above is executed for all thumbnail read requests in step S17, the process ends. At the same time, the cancel flag set earlier is canceled.

  Further, in the reproduction task described later, when it is determined that there is a cancel instruction from the cancel notification, the expansion and display processing is skipped, but all the remaining “thumbnail read completion notifications” for 20 frames ( The above-described skipping process is continued until a cancel notification is received.

  For example, when 100 image files are stored in the memory card 109 shown in FIG. 1, it is not possible to display all image files on one page (screen) on the LCD 110 (display device) of the digital camera device. The image file for 100 sheets is displayed by dividing it into two pieces. Now, when the user wants to view the third page immediately, such as when the image display on the first or second page starts, if the cancel instruction is given from the operation unit 114, the current processing is performed. The processing of reading, expanding, and displaying the corresponding page can be stopped and the next page can be displayed more quickly after the continuous processing.

  FIG. 12 is a flowchart showing thumbnail read completion notification processing in the playback task of this embodiment. The thumbnail read completion notification process will be described based on FIG. 12 with reference to FIGS.

  As shown in FIG. 12, in the reproduction task, when the “thumbnail read completion notification” is received from the file task (S21), it is next checked whether or not an instruction to cancel the process has been issued (S22), and there is a cancellation. When (Yes in S22), the image expansion process and the display process are skipped. If there is no cancellation (No in S22), a compressed thumbnail image in the read image file data shown in FIG. 4 is extracted and converted into YUV data by decompression processing (S23). The area to be converted into YUV data is designated in order from the upper left, from the first image to the twentieth image, as shown in the reproduction screen of FIG. When the expansion processing to the designated area is completed, display processing on the display device is started (S24).

  In the example of “thumbnail read completion notification” shown in FIG. 10B, since the “image number” currently being processed and the “total number of images” are specified, it is determined whether or not the processing of all image files has been completed. (S25). Here, the “total number of images” is 20 frames, and if “thumbnail read completion notification” having the same “image number” is received (Yes in S25), the processing ends. If the image file read remains, the process continues to wait for the “thumbnail read completion notification” (S26). When the “thumbnail read completion notification” is received (Yes in S26), the process returns to step S22 again to repeat the process. Go.

  Further, in the present embodiment, as a process for reproducing a plurality of image files, an example has been described in which display is performed by reading the image header portion from the image file data shown in FIG. 4 and extracting the corresponding thumbnail image. The present invention can also be applied when reading the entire data and extracting main image data. Even image file data having no thumbnail image can be used.

  When the main image data is extracted and displayed, the plurality of images shown in FIG. 5 may not be arranged and displayed on the LCD 110, but the display may be changed at regular time intervals. The order (header number, etc.) is displayed by the OSD 122, and the process of reading, decompressing and displaying up to the corresponding header number may be skipped by inputting the header number specified by the user instead of the cancel instruction described above. Is possible.

Image reproduction equipment according to the present invention reads the reproduction of a plurality of image files at a high speed, it is possible to parallel processing of displaying by expanding the number of image files to be processed for reproducing processed faster growing This is useful for controlling image reproduction.

1 is a block diagram showing a digital camera device according to an embodiment of the present invention. The figure which shows an example of the format of a memory card The figure which shows an example of the data structure stored in a directory entry area | region The figure which shows an example of the data structure of an image data file storage area The figure which shows the example which displayed the list of 20 reduction images on the display device The figure which shows the reproduction | regeneration signal sequence when not implementing this invention The figure which shows an example of the reproduction signal sequence of this embodiment The figure which shows the operation | movement sequence of each process of this embodiment. A flowchart showing N (20) frame playback request processing in the playback task of the present embodiment. Diagram showing an example of the structure of a notification message exchanged between tasks A flowchart showing thumbnail read completion notification processing in the file task of this embodiment A flowchart showing thumbnail read completion notification processing in the playback task of the present embodiment

Explanation of symbols

101 Lens 102 Mechanical mechanism 103 CCD
104 CDS circuits 105 and 120 A / D converter 106 Digital signal processing circuit 107 Compression / decompression circuit 108 DRAM
109 Memory card 110 LCD
111 Driver 112 SG
113 CPU
114 Operation unit 115 Strobe 116 Microphone 117, 121 AMP / FILTER
118 D / A converter 119 Audio data compression / decompression circuit 122 OSD
123 RAM
124 CPU bus 125 C / DC converter 126 Battery 127 AC adapter 201 Attribute area 202 Boot selector area 203 FAT area 204 Directory entry area 205 Image file data storage area 206 Audio file data storage area

Claims (4)

A reading means for reading the compressed image file into the memory;
Decompression means for decompressing image file data read into the memory;
Control means for controlling the reading means and the expansion means;
Confirmation means for confirming whether or not there is an instruction to cancel the processing during the continuous processing controlled by the control means;
Display means for reproducing and displaying thumbnail images of a plurality of frames expanded by the expansion means on a display unit as a list ;
When the control means receives an instruction to display and reproduce a list of thumbnail images, the control means transmits a thumbnail read request to the reading means, and the reading means reads the image header portion of the image file specified by the received thumbnail read request. When the reading of the image header portion is completed, a thumbnail read completion notification is transmitted to the control means.
When receiving the thumbnail read completion notification, the control means controls the decompression means to decompress the thumbnail image extracted from the read image header portion,
Further, the control means performs reading by the reading means and decompression processing by the decompressing means in parallel, and reading and decompressing a plurality of image files by the reading means and the decompressing means are performed in succession. and control to divide,
Further, upon receiving an instruction to display and reproduce the plurality of frames, the control means collectively creates the thumbnail read requests for the plurality of frames, and continuously issues the thumbnail read requests for the plurality of frames to the reading means. The reading means transmits the thumbnail read completion notification every time reading of the image header portion of the image file for one frame is completed based on the received thumbnail read request for the plurality of frames,
Further, the control means controls to stop and end the continuous processing upon confirmation of the cancel instruction by the confirmation means . When the confirmation unit confirms that the cancel instruction is present, the reading unit transmits the thumbnail read completion notification without reading the image header portion after the confirmation is made. Item 2. The image playback device according to Item 1. The thumbnail read request includes information on the number of the plurality of frames and an image number N (N: 1 to the number of the plurality of frames),
The reading means compares the number of the plurality of frames in the processed thumbnail read request with the image number to determine whether or not the reading of the image header portion for the plurality of frames has been completed. The image reproducing apparatus according to claim 1 or 2 . Before SL control means, said reading means according to the reading and display by said display means is performed in parallel, read and decompression and display processing of the reading means and said decompressing means and said display means and by a plurality of image files The image reproduction device according to claim 1, wherein the image reproduction device is controlled so as to be continuously performed.

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