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Video decoding method

A video decoding and decoder technology, applied in the field of multimedia signal processing, can solve problems such as decoder reliability, reduced robustness, increased implementation cost, and reduced image quality

Active Publication Date: 2008-10-01
HANGZHOU NATCHIP SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, reducing the frame buffer space usually increases the complexity of the decoder, and the reliability and robustness of the decoder will also decrease with the reduction of the buffer. For example, in the patent EP0778709A1, the decoding data is recompressed to Ways to Reduce Buffer Requirements
Recompression is lossy, which will reduce the quality of the image, especially the accumulation of errors; recompression also requires additional pixel operations, which increases the implementation cost

Method used

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Embodiment Construction

[0025] figure 1 It is a decoder structure diagram among the present invention, and it comprises following modules: read compressed stream interface and compressed stream memory 101, video decoding operation module 102, write-back interface and write-back memory 103, frame buffer 104, original compressed stream buffer 105. The decoded frame buffer 104 is shared with the original compressed stream buffer 105, usually SDRAM.

[0026] figure 1 Comprise following data flow: original compression stream data, it enters original compression stream buffer 105, and this data comes from other modules, and it is the image data after compression, also is the image data to be decoded; Enter compression from original compression stream buffer 105 The stream memory 101 is compressed stream data; the decoded image write-back data enters the frame buffer 104 from the write-back interface and the write-back memory 103; the decoded data for playback or other processing is read from the frame ...

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Abstract

The invention relates to a video decode method, which can solve the problem of present technique which adds the complexity of decoder to reduce the space of frame buffer, to cause the decrease of reliability and robustness. The invention, via multi decoding on B frames, realizes the decoding and displaying of 2-3 frame buffers, without additional calculation and reducing the image quality. The invention also uses special decode protective operation, to confirm the reliability and stability of decoder.

Description

technical field [0001] The invention belongs to the field of multimedia signal processing, in particular to a video decoding method. Background technique [0002] Digital video signals generally use the IPB compression method to eliminate the redundancy of the time domain and space domain of the image, such as the popular MPEG-1, MPEG-2, MPEG-4, H.261, H.263, H.264, etc. . In the decoder, the I picture and the P picture must be put into the buffer after decoding, so as to prepare for playing and decoding the subsequent P and B pictures. The B picture is decoded according to the past frame and the future frame, and the decoded data can be used for direct display. The processing method of the B picture directly affects the size of the buffer. [0003] Digital images have multiple structures, including frame diagrams, top fields and bottom fields, where a top field and a bottom field form a frame. According to whether there is a field time difference between two fields in a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/24
Inventor 庞智博张丁黄晓伟
Owner HANGZHOU NATCHIP SCI & TECH
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