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
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[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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