JPEG (Joint Photographic Experts Group) image decompression method, device and platform

Abstract

The invention discloses a JPEG (Joint Photographic Experts Group) image decompression method, device and platform. The method includes the following steps that: an FPGA (Field Programmable Gate Array) end receives the encoding information of images to be decompressed sent by a CPU (Central Processing Unit) end; the FPGA end adaptively determines the number of the processing paths of Huffman decoding through using a preset JPEG image decoding algorithm and according to the number of the images to be decompressed; the FPGA end performs Huffman decoding operation in parallel on the plurality of paths of the data of the images to be decompressed according to the encoding information and the number of the processing paths of the Huffman decoding; the FPGA end adaptively determines the number of the processing paths of inverse discrete cosine transformation and RGB transformation according to the number of the processing paths of the Huffman decoding; and the FPGA end performs inverse discrete cosine transformation and RGB transformation in parallel on the plurality of paths of the data of the images to be decompressed which have been subjected to the Huffman decoding according to the determined number of the processing paths, so that decompressed image data are obtained. Thus, with the JPEG image decompression method, device and platform of the invention adopted, the bottleneck of decompression performance can be eliminated, and decompression efficiency can be improved.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a JPEG image decompression method, device and platform. Background technique [0002] At present, there are many mature algorithms for image compression and decompression, and for images of different formats, the corresponding compression process and decompression process will be different accordingly. Among them, the JPEG compression algorithm is particularly widely used. [0003] In the prior art, JPEG image decompression is generally carried out on the CPU+FPGA heterogeneous acceleration platform. The specific process is: the FPGA side only performs multi-channel parallel processing on the Huffman decoding part, and then performs IDCT processing and RGB conversion. To obtain decompressed JPEG image data. [0004] However, when the number of JPEG images is not processed in this way, it can have a good hardware acceleration effect. However, when processing massive JP...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a JPEG image decompression method, device and platform to solve the problem that the existing CPU+FPGA heterogeneous platform cannot adaptively change the number o

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