JPEG image lossless compression and decompression method, system and device

A lossless compression and image technology, applied in the field of image processing, can solve the problems of gain limitation and inability to accurately estimate the AC coefficient, etc., and achieve the effect of improving lossless compression gain, ensuring the simplicity and efficiency of calculation, and improving the compression rate

Active Publication Date: 2021-12-17
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

However, these traditional methods manually adjust the parameters of each module, and they are mainly aimed at the DC coefficient (DC) of the discrete cosine transform (DCT) coefficient, but they cannot accurately estimate the AC coefficient (AC) in the DCT coefficient, so the gain has a certain limit

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  • JPEG image lossless compression and decompression method, system and device
  • JPEG image lossless compression and decompression method, system and device
  • JPEG image lossless compression and decompression method, system and device

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Embodiment Construction

[0068] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0069] figure 1 It is a flowchart of a JPEG image compression method in an embodiment of the present invention.

[0070] refer to figure 1 Shown, the JPEG image compression method in the present embodiment, comprises the steps:

[0071] S100, partially decode the JPEG image to obtain discrete cosine transform (DCT) coefficients and quantization tables of brightness (Y component) and chrominance (Cb, Cr components), and cache them;

[0072] S200, sort the DCT coefficients of brightness (Y compon...

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Abstract

The invention provides a JPEG image lossless compression and decompression method, system and device, and the method comprises the steps: decoding a JPEG image part, obtaining a DCT coefficient and a quantization table of brightness and chromaticity, and performing caching; sorting the DCT coefficients according to corresponding frequency bands, and dividing the sorted DCT coefficients into a plurality of frequency groups; for the frequency groups, extracting contexts from DCT coefficients of frequency bands to which the contexts belong one by one by adopting a convolutional neural network; and predicting probability distribution of the DCT coefficient according to the context, and performing arithmetic coding to obtain a binary code stream. According to the method, on the premise of only partially decoding the JPEG image, the compression ratio of the JPEG image is improved, and no content in the image is changed. The JPEG image coding format which is widely used at present is compatible.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to a JPEG image lossless compression and decompression method, system and device. Background technique [0002] Looking forward to the future, after the arrival of the 5G era, short videos and live broadcasts will become the mainstream way of obtaining information. Users can freely switch between multiple terminals such as TVs, mobile phones, and tablets. Higher requirements are put forward, especially more storage space is required. The media cloud can just meet this demand, and the market size of this industry is expected to exceed 30 billion yuan in the future. Under this vision, even with a low-configuration laptop, with the help of cloud media computing capabilities, editing of multi-layer 4K ultra-high resolution video programs can be completed. The media cloud service aims at the video processing needs of media, education, government and enterprises, etc. B...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/124H04N19/186H04N19/625G06N3/04G06N3/08
CPCH04N19/124H04N19/186H04N19/625G06N3/08G06N3/045
Inventor 戴文睿骆继祥李成林邹君妮熊红凯
Owner SHANGHAI JIAO TONG UNIV
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