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Image lossless compression method and device

A lossless compression, image technology, applied in the direction of image communication, digital video signal modification, electrical components, etc., can solve the problem that the compression accuracy needs to be improved, and achieve the effect of improving the compression rate and smoothing the image change.

Active Publication Date: 2019-06-21
BEIJING QIYI CENTURY SCI & TECH CO LTD
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Problems solved by technology

[0007] Existing image lossless methods based on prediction-entropy coding, such as JPEG-LS, CALIC, etc., use relatively simple gradient calculations, so the compression accuracy needs to be improved

Method used

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  • Image lossless compression method and device
  • Image lossless compression method and device

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Embodiment Construction

[0041] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0042] The embodiment of the present invention is based on a pre-selected reference pixel template, and multiple directions are set in the reference pixel template. By calculating the gradient of each direction, the direction with the smallest gradient is selected, and the prediction of the current coded pixel a will be determined by a at the point where the gradient is the smallest Several pixels in the same direction in this direction are calculated by interpolation filtering.

[0043] refer to image 3 , is a flow chart of a method for image lossless compression provided by an embodiment of the present invention, the method includes steps S301-S304.

[0044] S301: For the current pixel, select a reference pixel template, and s...

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Abstract

The invention provides a lossless image compression method and device. The method comprises the following steps: selecting a reference pixel template for a current pixel, and setting a plurality of gradient calculation directions in the reference pixel template; calculating the direction gradient for each direction; selecting the direction with the minimum direction gradient, and obtaining a predicted pixel of the current pixel through calculation according to a plurality of homodromous pixels of the current pixel in the direction with the minimum direction gradient; and obtaining a pixel residual through subtraction between the current pixel and the predicted pixel, and carrying out encoding through the pixel residual. The method and device provided by the invention has the advantage that the lossless compression rate is improved.

Description

technical field [0001] The invention relates to the technical field of image compression, in particular to an image lossless compression method and device. Background technique [0002] In some application fields, due to the requirement of high fidelity, the image data cannot have any loss during the compression process, so it is necessary to perform lossless compression on the image. The lossless compression of images is to use the statistical redundancy of data for compression, which can completely restore the original data without causing any distortion, but the compression rate is limited by the theory of data statistical redundancy, and the general compression rate is 2:1 to 5: 1. This type of method is widely used in the compression of text data, program data and image data in special applications (such as fingerprint images, medical images, etc.). [0003] Image lossless compression algorithms are divided into three categories: the first category is the method of pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/91H04N19/182H04N19/50H04N19/42
CPCH04N19/182H04N19/42H04N19/50H04N19/91
Inventor 朱洪波
Owner BEIJING QIYI CENTURY SCI & TECH CO LTD
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