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Method for high speed JPEG decoding

A decoding algorithm and high-speed technology, applied in the field of high-speed JPEG decoding, can solve the problem of high computational complexity and achieve the effect of simple transformation

Active Publication Date: 2012-06-06
SHANGHAI FEILAIFEIQU NEW MEDIA EXHIBITION DESIGN CO LTD
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AI Technical Summary

Problems solved by technology

The bottleneck of the JPEG algorithm lies in the complete serial Huffman decoding process and the high computational complexity of IDCT. After a long period of optimization, the existing algorithm has been difficult to achieve a breakthrough in performance.

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  • Method for high speed JPEG decoding
  • Method for high speed JPEG decoding
  • Method for high speed JPEG decoding

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Embodiment Construction

[0023] In order to meet the requirements of fast and efficient decoding of JPEG files in the multimedia field, and at the same time meet the requirements of high-definition video decoding computing speed, smoothly support high-definition decoding, effectively use the computing resources of the graphics card GPU, and reduce the consumption of CPU resources. The bottleneck of the JPEG algorithm lies in the high computational complexity of the fully serial Huffman decoding process and IDCT. The present invention provides two technical solutions for the improvement of the Huffman decoding process: one is: the address of the encoding block is recorded in the encoding process , to establish the index structure of the entire data stream; the second is to dynamically scan the data stream to detect the position of the encoding block. Through the above two schemes, the problem of serialization in the JPEG algorithm decoding process can be eliminated; the invention improves the paralleliz...

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Abstract

The invention relates to a method for high speed JPEG decoding, which comprises the following steps: designing and achieving a parallel Huffman decoding algorithm, and extracting the actual regional coding data from encoding blocks; restoring the extracted regional coding data into the original coded data through global checks; designing and achieving an IDCT algorithm, and reproducing the operational data used by each processing unit into a shared drive; calculating two steps of IDCT by each processing unit, performing one time of synchronous operation in the middle, and determining that allthe processing units finish the step; and restoring the result after finishing the calculations into actual image data through quantification by each processing unit. Compared with the prior art, themethod can achieve that a JPEG image of which the resolution ratio is 1024*768 can be decoded in real time at a rate of more than 60 FPS per second on a common PC machine provided with the current mainstream display card and the CUP occupancy is less than 10 percent, and can achieve the decoding supporting high-definition video through simple reconstruction.

Description

technical field [0001] The invention relates to a method for quickly and efficiently decoding JPEG files in the field of multimedia, in particular to a high-speed JPEG decoding method. Background technique [0002] In order to meet the requirements of fast and efficient decoding of JPEG files in the multimedia field, and at the same time meet the requirements of high-definition video decoding computing speed, smoothly support high-definition decoding, effectively use the computing resources of the graphics card GPU, and reduce the consumption of CPU resources. The bottleneck of the JPEG algorithm lies in the complete serial Huffman decoding process and the high computational complexity of IDCT. After a long period of optimization, the existing algorithm has been difficult to achieve a breakthrough in performance. Contents of the invention [0003] The purpose of the present invention is to overcome the defects in the above-mentioned prior art, and provide a method for real...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H03M7/40H04N19/44
Inventor 杨青青飞苹果
Owner SHANGHAI FEILAIFEIQU NEW MEDIA EXHIBITION DESIGN CO LTD
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