JPEG high-speed decoding method

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

Inactive Publication Date: 2017-04-05
TIANJIN JUNBANG TECH CO LTD
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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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Embodiment Construction

[0024] In order to meet the requirements of fast and efficient decoding of 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 parallelization...

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Abstract

The invention relates to a JPEG high-speed decoding method. The method comprises steps of parallel-conducting Huffman decoding algorithm design and realization, extracting practical local coding data from an encoding block, restoring the extracted local coding data to primary coding data, parallel-conducting IDCI algorithm design and realization, copying operation data used for each processing unit to a shared memory, calculating two steps of IDCT by each processing unit, and conducting one time synchronization operation in the middle, determining all processing unit finishing the previous step, and quantifying calculated results by each processing unit and restoring the same to practical image data. Compared with the prior art, for PC machines equipped with current mainstream video card GPU, JPEG images with definition of 1024x768 can be real-time decoded for above 60FPS each second, and CPU occupancy rate is less than 10%; and with simple improvements, high-definition video decoding can be realized.

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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IPC IPC(8): H04N19/436H04N19/176H04N19/625H04N19/44
CPCH04N19/436H04N19/176H04N19/44H04N19/625
Inventor 包训阳
Owner TIANJIN JUNBANG TECH CO LTD
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