JP2009100206A - Image coding and data-decoding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To also properly decode, reproduce a still image, while smoothly reproducing moving images, without having to temporarily interrupt moving image decoding processings, when the moving image and the still image are attempted to be processed simultaneously, using a single LSI in an image data processing apparatus. <P>SOLUTION: During an arbitrary predetermined period, an operation security period 1401 of a moving image of the first frame is set, and moving image processing 1405 of the first frame is performed. Next, an operation security period 1402 of the still image is set, and a still image processing 1406, from the 1MCU-th to the nMCU-th, is performed. When the operation security period 1402 passes, an interruption request 1409 is issued, and the period enters the next arbitrary predetermined period. In the predetermined period, an operation security period 1403 of the moving image of the second frame is set, after moving image processing 1407 of the second frame is performed, and an operation security period 1404 of the still image is set; and still image restart processings 1408, from the (n+1)MCU-th to the mMCU-th, are performed. These operations are preformed repeatedly. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an apparatus that decodes image data to be decoded, and more particularly to an image encoded data decoding apparatus that effectively decodes a plurality of image data to be decoded by one LSI.

  In recent years, the development of DVR and DTV has been remarkable, and there has been a demand for decoding still images simultaneously with moving images.

  This request can be easily mounted if the moving image and the still image are processed by separate LSIs. However, in order to provide versatility and low cost, it is necessary to mount by one LSI.

In the case where only one LSI is mounted, the conventional image data compression method, for example, as disclosed in Patent Document 1, stops the low-priority moving image compression process and the high-priority still image compression process. Has priority.
JP 2006-109032 (page 11, FIG. 2)

  However, in the conventional image data compression method, when a moving image and a still image are simultaneously recorded, the low-priority moving image compression processing is stopped, and the high-priority still image compression processing is prioritized.

  Therefore, at the time of still image processing, there is a problem that the moving image stops because the moving image processing is temporarily interrupted.

  An object of the present invention is to provide an image encoded data decoding apparatus that decodes moving image encoded data and still image encoded data with a single LSI, without temporarily interrupting the decoding processing of the moving image encoded data. It is also desirable to decode the converted data satisfactorily.

  In order to achieve the above object, the present invention continues the video decoding process in an arbitrary predetermined period, and allocates a free time after the video decoding process within the predetermined period to a time of the still picture decoding process. To do.

  Specifically, the image encoded data decoding apparatus according to the first aspect of the present invention includes image decoding means for decoding moving image encoded data or still image encoded data when reproducing compressed image encoded data. Digital image encoding comprising: storage means for storing decoded data output from the image decoding means for display and decoding of other image encoded data; and control means for controlling decoding of the image decoding means In the data decoding apparatus, the control means controls to perform decoding of the moving image encoded data and decoding of the still image encoded data by switching in a time division manner.

  According to a second aspect of the present invention, in the encoded image data decoding device according to the first aspect, the control means switches between decoding of the moving image encoded data and decoding of the still image encoded data in a time division manner. Further, the still image encoded data is decoded using a free time within a range in which the real time property of the moving image data can be guaranteed.

  According to a third aspect of the present invention, in the image encoded data decoding device according to the first aspect, the control means switches the moving image encoded data during a period in which the still image encoded data is being decoded. When instructed, the interrupt information of the still image encoded data is stored by the image decoding means, and when decoding the next still image encoded data, from the interrupted location based on the interrupt information stored by the image decoding means Control is performed so that decoding of still image encoded data is resumed.

  According to a fourth aspect of the present invention, in the image encoded data decoding device according to the third aspect, when the control means interrupts the decoding of the still image encoded data, the subsequent still image encoded data The decoding process is controlled so as to be automatically continued until the process for one frame is completed.

  According to a fifth aspect of the present invention, in the image encoded data decoding apparatus according to the first aspect, the control means switches the decoding to still image encoded data with the completion of decoding of the moving image encoded data as a trigger. It is characterized by controlling to.

  According to a sixth aspect of the present invention, in the image encoded data decoding device according to the first aspect, the control means switches in advance between decoding of moving image encoded data and decoding of still image encoded data in advance. Control is performed so as to switch at a set allocation time.

  According to a seventh aspect of the present invention, in the encoded image data decoding device according to the sixth aspect, the control means performs the decoding process even if the preset time for decoding the encoded moving image data has passed. If not completed, in the next decoding of the moving image encoded data, control is performed so as to lengthen the allocation time of decoding of the moving image encoded data.

  According to an eighth aspect of the present invention, in the image encoded data decoding device according to the sixth aspect, the control means performs the decoding process even if the preset allocation time in the decoding of the moving image encoded data has passed. In the case where the decoding is not completed, in the next decoding of the moving image encoded data, control is performed such that the picture that has not been decoded is skipped, and further, the preset picture is skipped and then decoding is started. It is characterized by that.

  According to a ninth aspect of the present invention, in the encoded image data decoding apparatus according to the sixth aspect, the control means completes the decoding process even after the preset time for decoding the encoded moving image data has passed. If not, in the next decoding of the moving image encoded data, control is performed such that decoding is started again from the head of the picture that has not been decoded.

  According to a tenth aspect of the present invention, in the image encoded data decoding device according to the sixth aspect, the control means instructs the interruption from the control means in the calculation of the allocation time of decoding of still image encoded data. So that the time required until the image decoding means is actually interrupted is estimated before the decoding process, the allocated time for decoding the still image encoded data is corrected based on the estimation, and the decoding process is started. It is characterized by controlling.

  According to an eleventh aspect of the present invention, in the encoded image data decoding device according to the first aspect, the still image encoded data is JPEG.

  According to a twelfth aspect of the present invention, in the image encoded data decoding apparatus according to the eleventh aspect, the control means controls the JPEG decoding to be performed in an arbitrary unit obtained by dividing one frame. And

  As described above, according to the first to twelfth aspects of the present invention, the decoding process of the still image encoded data is performed using the free time within the predetermined time of the decoding process of the encoded moving image data. It is possible to satisfactorily decode still image encoded data without temporarily interrupting the processing. Therefore, the moving image is not temporarily stopped due to the temporary interruption of the moving image processing.

  As described above, according to the image encoded data decoding apparatus according to the first to twelfth aspects of the present invention, simultaneous decoding of a still image and a moving image can be realized with one LSI without causing a system failure. be able to.

  In addition, it is possible to smoothly cope with simultaneous operation with still images for other types of codecs.

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

(Embodiment 1)
A first embodiment of the present invention will be described.

  As an example of an image encoded data decoding device, FIG. 1 shows a configuration example of an image encoded data decoding device capable of decoding two streams in a time division manner according to an embodiment of the present invention.

  Of the plurality of decodable streams, one is a still image (JPEG), and the other is a moving image (MPEG2 or the like).

  1 includes a multi-codec decoding unit (image decoding unit) 802 including a still image decoding interruption information storage unit 801 and a process switching control unit (control unit) 803. The image decoding device 804 and the decoded data output unit 805 are configured.

  The input from the storage medium is assumed, and data is secured in separate memories for moving images and still images. The configuration of the decoded data output unit 805 assumes a display for both moving images and still images. The process switching control unit 803 includes an internal signal or external signal input mechanism for notifying process switching, and includes a mechanism for switching between a still picture decoding process and a moving picture decoding process.

  A configuration when the multi-codec decoding processing unit 802 processes MPEG2 will be described with reference to FIG.

  The configuration when processing the moving image encoded data is MPEG2 configured by a buffer 901 that holds image data input from the outside, a VLD unit 902, an IQ / IDCT unit 903, a motion compensation unit 904, and an internal memory 905. The decoding unit 906 and a buffer (storage unit) 907 that holds the decoded image are configured.

  Here, the multi-codec decoding processing unit 802 includes a mechanism for processing a moving image in units of one frame.

  A configuration when the multi-codec decoding processing unit 802 processes a still image will be described with reference to FIG.

  The configuration at the time of processing the still image encoded data includes a buffer 1001 for holding image data input from the outside, a JPEG decoding unit 1004 including a VLD unit 1002 and an IQ / IDCT unit 1003, a still image encoded data When the decoding process is interrupted, it comprises a storage unit 801 that stores information for resuming from where it was interrupted, and a buffer (storage means) 1005 that stores the decoded image.

  The VLD unit 1002 and IQ / IDCT unit 1003 used here are the same resources as those used when processing moving image encoded data.

  Next, an example of the operation of the process switching control unit 803 when decoding moving images and still images in a time division manner will be described with reference to the flowchart shown in FIG.

  First, in order to maintain the guaranteed period of the moving picture decoding process, the process switching control unit 803 sets the operation guaranteed period (allocation period) 1101 of the moving picture decoding process. After the setting, start 1102 of the video decoding process is performed. It is determined 1103 whether the decoding process for one frame is completed or whether the operation guarantee period has elapsed. If the determination result is false, the video decoding process start 1102 is continued. If the determination result is true, the factor that becomes true is determined 1104. If the operation guarantee period has elapsed, the moving picture decoding process is stopped 1105. When the decoding process for one frame has been completed, the decoding is switched to still image encoded data with the completion of decoding of the moving image encoded data as a trigger. When the moving image processing is stopped, the decoding is started again from the beginning of the same frame by extending the maximum period during which the operation guarantee period can be taken at the next decoding opportunity. If decoding is still impossible, the decoding of the same frame is stopped, a preset picture is skipped, and then the next frame is decoded. When the decoding of the moving image is delayed by this series of processes, the allocation time for decoding the still image is allocated to decoding of the moving image.

  Next, an operation guarantee period (allocation period) setting 1106 of the still image decoding process is performed. Since the system prioritizes decoding of moving image encoded data, the set value of the operation guarantee period of the still image decoding process is set in any predetermined period that is a time range in which the real-time property of moving image data can be sufficiently guaranteed. Use free time after video processing. That is, the set value of the operation guarantee period for the still picture decoding process is set to a value of (arbitrary predetermined period−operation guarantee period for the moving picture decoding process). After this setting, the start 1107 of the still image decoding process is performed. It is determined 1108 whether the decoding process for one frame is completed or whether the operation guarantee period has elapsed. If the determination result is false, the start 1107 of the still image decoding process is continued. If the determination result is true, the factor that becomes true is determined 1109. If the operation guarantee period has elapsed, the still image decoding process is interrupted 1110. If the decoding process for one frame has been completed, nothing is done.

  The moving image process does not resume, but the still image process resumes. For this reason, when the operation guarantee period has elapsed, the video decoding process stops 1105, but the still picture decoding process stops 1110.

  Next, an example of the operation of the moving image decoding process will be described with reference to the flowchart shown in FIG.

  First, input processing of image data to be decoded is performed 1201. Next, a decoding process of a moving image for one frame is started 1202. Then, it is determined whether or not a stop request is received from the process switching control unit 803 during decoding, and if there is, the moving picture decoding process is stopped 1204. If there is no stop request, it is determined 1205 whether or not the decoding process of the moving image for one frame has been completed. If completed, the processing switching control unit 803 is notified 1206 of the completion of processing of one frame of moving image, and the moving image decoding process is terminated. If not completed, the process returns to the determination 1203 of whether or not a stop request has been received from the process switching control unit 803 during decoding.

  Next, an example of the still image processing operation will be described with reference to the flowchart shown in FIG.

  First, an image data input process 1301 is executed. Next, it is determined 1302 whether the process is a decoding restart process or a start process. In the case of the restart process, the interruption information is read from the interruption information storage unit 801 1303. Nothing is done in the start process. Next, decoding 1304 is performed in an arbitrary unit. Then, a determination 1305 is made as to whether or not an interruption request has been received from the process switching control unit 803 during decoding, and if there is an interruption request, the still image decoding process is interrupted 1306. Then, the interrupt information is stored in the interrupt information storage unit 801 1307, and the still image decoding process is terminated. If there is no interruption request, it is determined 1308 whether or not the decoding process for one frame of the still image is completed, and if completed, the processing switching control unit 803 is notified of the completion of the processing for one frame of the still image 1309, The decryption process ends. If not completed, the process returns to decoding 1304 in arbitrary units. When the interruption process is executed and the next still image decoding process is a decoding resumption process, the interruption information and the resumption process are repeated by reading interruption information 1303, and processing for one frame is performed. The still image decoding process is automatically continued until is completed.

  Next, an example of operations of still image compression processing and moving image compression processing will be described with reference to a time chart shown in FIG.

  FIG. 7 shows processing timings of still images and moving images in accordance with an arbitrary period of moving image output. The solid line in the figure indicates that the process is being executed.

  First, during an arbitrary period, a motion guarantee period 1401 for the first frame of moving images is set, and moving image processing 1405 of the first frame is performed. Next, a still image operation guarantee period 1402 is set, and a still image processing 1406 of 1 MCU to n MCUs (arbitrary predetermined unit) of one unit among a plurality of units obtained by dividing one frame into a plurality of units is performed. . Usually, a still image has a larger picture quality than a moving image, and therefore, decoding of one frame often does not end within the operation guarantee period of still image encoded data.

  Therefore, as shown in the figure, when the operation guarantee period elapses in the still image start process 1406, an interruption request 1409 is issued to switch the process. Similarly, in the next arbitrary predetermined period, the motion guarantee period 1403 for the second frame is set, and the second frame moving image processing 1407 is performed. Next, a still image operation guarantee period 1404 is set, and a still image resumption process 1408 from the (n + 1) th MCU to the m MCU (arbitrary predetermined unit) is performed. When the operation guarantee period elapses in the still image start process 1408, an interruption request 1410 is issued to switch the process.

  For moving images, processing is completed in units of one frame, but for still images, interruption and resumption are automatically repeated and continued, and finally one frame is decoded.

  As described above, in this embodiment, both the still image encoded data and the moving image encoded data are decoded within an arbitrary predetermined period, so that the still image display can be performed without disturbing the moving image display. Can do.

(Embodiment 2)
Next, a second embodiment of the present invention will be described.

  In the second embodiment, resizing processing is added to the still image processing of the first embodiment.

  Decoding of still images can be interrupted immediately in arbitrary units, but resizing processing can be interrupted only in units larger than that depending on the size. For this reason, there may be a time lag in switching to moving image processing after issuing an interruption request to still image processing, and moving image processing may fail. In order to avoid this, the time lag time is estimated as a correction value from the still picture size as a correction value, predicted, and the still image obtained by subtracting the predicted correction value from the initially assigned still image operation guarantee period. Reset as the operation guarantee period.

  The image encoded data decoding apparatus shown in FIG. 8 includes a multi-codec decoding unit 1502 including a resizing process including a still image decoding / resizing process interruption information storage unit 1501 and a process switching control unit 1503. Image decoding apparatus 1504 and a decoded data output unit 805.

  The configuration of the input and decoded data output unit 805 is the same as that of the first embodiment. The process switching control unit 1503 includes an internal signal or external signal input mechanism for notifying process switching, and includes a mechanism for switching between still image decoding / resizing processing and moving image decoding processing by dividing each time. Further, the process switching control unit 1503 includes a mechanism that receives the correction value from the multi-codec decoding unit 1502 as an input and resets the still image operation guarantee period.

  Hereinafter, the configuration of the JPEG decoding (still image decoding) / resizing unit 1502 will be described with reference to FIG.

  The only difference from the first embodiment is that a resizing configuration is added. The added configuration is a low-speed operation buffer (low speed) 1601 that holds a decoded image input to the JPEG decoding / resizing unit 1606 and a high-speed operation buffer (high speed) 1602 that holds a decoded image input to the resize unit 1606. A resize processing unit 1603, a high-speed operation buffer 1604 (high speed) for storing the resized image, and a low speed operation buffer 1605 (low speed) for storing the resized image. The configuration updated by including the resizing process is a JPEG decoding / resizing processing unit 1606. Also, the configuration updated by including the resize processing interruption information is a still image decoding / resizing processing interruption information storage unit 1501.

  As a problem, when the processing picture size is large, the processing time for data transfer between the low-speed memory and the high-speed memory per processing unit is longer than the decoding process. Since data transfer does not go through the CPU, it cannot be interrupted. Therefore, it takes time for interruption processing.

  In particular, when horizontal resizing is performed, when one line of the input image is transferred from the low-speed memory to the high-speed memory, if the horizontal size of the input picture is large, it takes time for the interruption process.

  Although there is an alternative means for dividing the transfer unit, since the transfer setting must be made in fine units, the processing speed of the entire resizing process becomes slow.

  Hereinafter, a timing chart of the resizing process will be described with reference to FIG. In the figure, the transfer time from the buffer (low speed) 1601 holding the decoded image input to the resize processing unit 1603 to the buffer (high speed) 1602 holding the decoded image input to the resize processing unit 1603 is denoted by reference numeral 2101 in FIG. The resize processing time is denoted by reference numeral 2102, and the transfer time from the resize processing unit 1603 to the buffer 1604 (high speed) for storing the resized image and the buffer 1605 (low speed) for storing the resized image is encoded. 2103. It takes a relatively long time to transfer input data for resizing processing.

  A problem in the case where it takes time to interrupt still image decoding will be described with reference to a timing chart shown in FIG.

  FIG. 13 shows the decoding processing timing of a still image and a moving image in accordance with an arbitrary predetermined period of moving image output. The solid line in the figure indicates that the process is being executed.

  First, during an arbitrary predetermined period, the motion guarantee period 2001 for the first frame is set, and the first frame moving process 2005 is performed. Next, a still image operation guarantee period 2002 is set, and still image processing 2006 is performed. Usually, since a still picture has a larger picture quality than a moving picture, decoding of one frame often does not end within the still picture guarantee period.

  Therefore, as shown in the figure, when the operation guarantee period elapses in the still image start process 2006, an interruption request 2004 is issued to switch the process. Similarly, in the next arbitrary predetermined period, a motion guarantee period 2003 for the second frame moving image is set, and the second frame moving image processing 2007 is performed.

  However, as described with reference to FIG. 9, the data transfer performed by the resizing processing unit 1603 does not go through the CPU and cannot be interrupted in the middle. Therefore, an overlap with the moving image processing occurs 2008. As a result, the execution of moving image processing may be delayed and the system may fail.

  Next, an example of the operation of the process switching control unit 1503 will be described using the flowchart shown in FIG.

  The difference from the first embodiment is that the operation guarantee period of the still image is reset 1701 based on the correction value notified from the still image decoding process after the start 1107 of the still image decoding process. The reset value of the still image operation guarantee period sets (initially assigned still image operation guarantee period−correction value).

  Next, an example of the operation of the JPEG decoding / resizing unit 1606 will be described with reference to the flowchart shown in FIG.

  The difference from the first embodiment is that, before performing the image data input process 1301, a correction value for the still image operation guarantee period is calculated 1801, and then the calculated correction value is notified to the process switching control unit 1503. 1801 is the point.

  Note that the time lag for switching from the time point to the video decoding process after issuing a suspend request for still image processing depends on the data transfer time between the low-speed memory and the high-speed memory, as described in the resize processing mechanism. Depends on the picture. In particular, when the horizontal resize processing is executed, the processing time per processing unit is required most in order to transfer data of one horizontal line. Therefore, the maximum value of the time lag for switching from the time when the interruption request is issued for the still image decoding processing to the moving image processing is obtained by the following equation.

Maximum data transfer size from low speed memory to high speed memory
= Horizontal size and correction value of input picture (maximum value of time lag)
= Maximum data transfer size from low-speed memory to high-speed memory
/ Data Transfer Rate Next, an example of operations of still image compression processing and moving image compression processing will be described with reference to a time chart shown in FIG.

  In FIG. 12, the difference from the first embodiment is that the operation guarantee period of the still image allocated from the moving image processing 1402 and 1404 is shortened from the period of the correction value 1901 ahead of time, and the new still image operation guarantee period The points are reset as 1902 and 1903.

  As described above, in the present embodiment, the still image + resizing process and the moving image process can be implemented without failure within an arbitrary predetermined period.

  As described above, the present invention can satisfactorily decode still image encoded data without temporarily interrupting the decoding processing of moving image encoded data, so that the moving image is not temporarily displayed. Therefore, the present invention is useful as an image encoded data decoding apparatus capable of displaying good moving images and still images.

It is a figure which shows the structure of the image coding data decoding apparatus of the 1st Embodiment of this invention. It is a figure which shows the internal structure of the multi codec decoding process part contained in the image coding data decoding apparatus. It is a figure which shows the structure when the multi-codec decoding process part processes a still image. It is a flowchart figure which shows an example of an operation | movement when the process switching control part contained in the image coding data decoding apparatus decodes a moving image and a still image by a time division. It is a flowchart figure which shows an example of the moving image decoding process of the multi-codec decoding process part. It is a flowchart figure which shows an example of the still image process of the multi-codec decoding process part. It is a figure which shows an example of operation | movement with the still image compression process and moving image compression process by the multi-codec decoding process part. It is a figure which shows the structure of the image coding data decoding apparatus of the 2nd Embodiment of this invention. It is a figure which shows the structure of the multi codec decoding part containing the resizing process contained in the image coding data decoding apparatus. It is a flowchart figure which shows an example of operation | movement of the process switching control part contained in the image coding data decoding apparatus. It is a flowchart figure which shows an example of operation | movement of the multi codec decoding part including the resizing process. It is a figure which shows an example of operation | movement with the still image compression process and moving image compression process by the multi-codec decoding part including the resizing process. It is a figure which shows the subject when time is required for the interruption process of a still image. It is a figure which shows the timing of a resizing process.

Explanation of symbols

801, 1501 Storage unit 802 Multi-codec decoding unit (image decoding unit)
803 Process switching control unit (control means)
804 image decoding apparatus 805 decoded data output units 901, 1001, 1601,
1602, 1604, 1605 Buffer 902, 1002 VLD unit 903, 1003 IQ / IDCT unit 904 Motion compensation unit 906 MPEG2 decoding unit 907, 1005 Buffer (storage means)
1004 JPEG decoding unit 1502 Multi-codec decoding unit 1503 including resizing processing Processing switching control unit 1504 Image decoding device 1603 Resizing processing unit 1606 JPEG decoding / resizing unit

Claims (12)

In the case of reproducing compressed image encoded data,
Image decoding means for decoding moving image encoded data or still image encoded data;
Storage means for storing the decoded data output from the image decoding means for display and decoding of other image encoded data;
In a digital image encoded data decoding apparatus comprising control means for controlling decoding of the image decoding means,
The control means includes
An image encoded data decoding apparatus, characterized in that control is performed so that decoding of the moving image encoded data and decoding of the still image encoded data are switched in a time division manner. In the image encoded data decoding device according to claim 1,
The control means includes
When the decoding of the moving image encoded data and the decoding of the still image encoded data are switched in a time-sharing manner, the still image encoded data is utilized using a free time within a range in which the real-time property of the moving image data can be guaranteed. An image-encoded data decoding device characterized in that the decoding is performed. In the image encoded data decoding device according to claim 1,
The control means includes
When switching of moving image encoded data is instructed during the decoding period of the still image encoded data, the interruption information of the still image encoded data is saved by the image decoding means, and the next still image encoding is performed. An image encoded data decoding apparatus, wherein when decoding data, control is performed so as to resume decoding of still image encoded data from the interrupted location based on the interrupt information stored by the image decoding means. In the image encoded data decoding device according to claim 3,
The control means includes
When the decoding of still image encoded data is interrupted, the subsequent decoding of still image encoded data is controlled to continue automatically until the processing for one frame is completed. An image encoded data decoding apparatus. In the image encoded data decoding device according to claim 1,
The control means includes
An encoded image data decoding apparatus, wherein the decoding is switched to still image encoded data with the completion of decoding of moving image encoded data as a trigger. In the image encoded data decoding device according to claim 1,
The control means includes
An image encoded data decoding apparatus, characterized in that control is performed to switch between decoding of moving image encoded data and decoding of still image encoded data at a preset allocation time. The image encoded data decoding device according to claim 6, wherein:
The control means includes
In the decoding of moving image encoded data, if the decoding process is not completed even after the preset allocation time has passed, in the next decoding of the moving image encoded data, the allocation of decoding of the moving image encoded data is performed. An encoded image data decoding apparatus, characterized in that control is performed so as to lengthen the time. The image encoded data decoding device according to claim 6, wherein:
The control means includes
In the decoding of moving image encoded data, if the decoding process is not completed even after the preset allocation time has passed, the picture that has not been decoded is skipped in the next decoding of the moving image encoded data. In addition, the encoded image data decoding apparatus is further controlled to start decoding after skipping to a preset picture. The image encoded data decoding device according to claim 6, wherein:
The control means includes
If the decoding process is not completed even after the preset allocation time in the decoding of the moving image encoded data, the next decoding of the moving image encoded data starts again from the beginning of the picture that has not been decoded. An image-encoded data decoding device, characterized in that control is performed to start decoding. The image encoded data decoding device according to claim 6, wherein:
The control means includes
In the calculation of the allocated time for decoding of still image encoded data, the time required until the image decoding means is actually interrupted from an interruption instruction from the control means is estimated before decoding processing, and based on the estimate, the time An image-encoded data decoding apparatus, wherein the decoding time of still image encoded data is corrected and control is performed to start decoding processing. In the image encoded data decoding device according to claim 1,
The encoded image data decoding apparatus, wherein the encoded still image data is JPEG. In the image encoded data decoding device according to claim 11,
The control means includes
JPEG decoding is controlled so as to be performed in an arbitrary unit obtained by dividing one frame.

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