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Image decoding device

An image decoding and image technology, applied in the field of image decoding technology, can solve the problems of rising manufacturing costs of image decoding devices, etc.

Active Publication Date: 2009-08-26
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the large-capacity memory for image storage needs to operate, for example, at a higher frequency, and as a result, the manufacturing cost of the image decoding device increases significantly.

Method used

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Experimental program
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Embodiment approach 1

[0070] Hereinafter, the image decoding device 100 according to Embodiment 1 of the present invention will be described.

[0071]

[0072] figure 1 It is a configuration diagram of the image decoding device 100 according to Embodiment 1 of the present invention.

[0073] As shown in the figure, the image decoding device 100 includes a control unit 110, a memory 120, a DMA controller 130, a variable length decoding (VLD) processing unit 140, an inverse frequency conversion processing unit 150, a motion compensation processing unit 160, an intraframe The processing unit 170 , the deblocking filter processing unit 180 and the output buffer 190 .

[0074] Here, the memory 120 is a DRAM for storing a coded stream obtained by variable-length coding a compressed picture or the like and storing a reference picture. In addition, here, the term "image" is used as a term representing a concept that also includes image data expressing the content of an image to be displayed.

[0075]...

Embodiment approach 2

[0120] Next, an image decoding device 500 according to Embodiment 2 of the present invention will be described.

[0121] The image decoding device 100 according to Embodiment 1 described above has a configuration in which DMA transfer of all reference images corresponding to one macroblock is performed in each cycle time. On the other hand, the image decoding apparatus 500 according to the second embodiment has a configuration in which the DMA transfer of all the reference images corresponding to one macroblock cannot be completed within one cycle, and is controlled so as to correspond to each The DMA transfer of all reference images in two consecutive macroblocks is completed within two cycles.

[0122]

[0123] Figure 7 It is a configuration diagram of the image decoding device 500 according to Embodiment 2 of the present invention.

[0124] As shown in the figure, the image decoding device 500 includes a control unit 510, a memory 120, a DMA controller 130, a variable ...

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PUM

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Abstract

A video decoding device that performs decoding processing on blocks of a compressed video, the decoding processing including motion compensation processing for any blocks compressed based on one or more reference pictures, the device comprising: a memory that stores reference pictures; a compensation unit including an input buffer for storing one or more of the reference pictures and sequentially motion compensates block by block with reference to the stored reference pictures; a reference picture transfer unit reads, for one block in each time slot, all of the reference pictures corresponding to the one block, and write the read reference pictures to the input buffer; a judgment unit judges whether a total amount of the reference pictures read in each time slot is more than a predetermined amount; and a suppression unit suppresses, in a time slot for which the judgment unit judges affirmatively, access to the memory except read access.

Description

technical field [0001] The present invention relates to an image decoding device that decodes, that is, expands, compressed images, and particularly relates to an image decoding technology suitable for decoding compressed images based on the MPEG4AVC standard (Moving Picture Experts Group phase 4 Advanced Video Coding, ISO14496-10). Background technique [0002] Conventionally, when moving images are transmitted or recorded on recording media, there are known implementations that comply with the MPEG (Moving Picture Experts Group) standards, such as the MPEG2 video standard (ISO / IEC18818-2) and the MPEG4 visual standard (ISO / IEC14496-2). Compression techniques for these standards, and image decoding devices that decode images compressed according to these standards are also known. [0003] Such an image decoding device decodes a variable-length-coded stream of a compressed image loaded into a memory such as a large-capacity DRAM (Dynamic Random Access Memory) through the fol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/32H04N19/50H04N19/103H04N19/139H04N19/146H04N19/176H04N19/186H04N19/196H04N19/423H04N19/436H04N19/44H04N19/503H04N19/51H04N19/513H04N19/60H04N19/61H04N19/80H04N19/91
CPCH04N19/00278H04N19/00533H04N19/00515H04N19/00103H04N19/00206H04N19/00521H04N19/127H04N19/156H04N19/176H04N19/433H04N19/436H04N19/44
Inventor 田中健
Owner PANASONIC CORP