An Image Deblocking Filter Method Based on Second Order Gradient

A deblocking and second-order gradient technology, applied in the field of image processing, can solve the problems of long deblocking time and high computational complexity, improve filtering efficiency and overall encoding efficiency, reduce encoding block response, and prevent additional information loss Effect

Active Publication Date: 2021-02-02
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0005] The purpose of the present invention is to provide a second-order gradient-based image deblocking filtering method to improve the ability of deblocking in image compression in order to solve the problems of high computational complexity and long deblocking time of the above-mentioned deblocking method , improve the peak signal-to-noise ratio, reduce the computational complexity, and improve the subjective visual experience of the image at the same time

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  • An Image Deblocking Filter Method Based on Second Order Gradient
  • An Image Deblocking Filter Method Based on Second Order Gradient
  • An Image Deblocking Filter Method Based on Second Order Gradient

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Embodiment Construction

[0047] The present invention provides a deblocking filtering method based on the second-order gradient of the image. For the convenience of describing the content of the present invention, firstly, the term definitions are as follows:

[0048] Definition 1: Traditional JPEG image compression method

[0049] The traditional JPEG image compression method is to compress the image in blocks according to the JPEG image compression standard, which includes the classic image block method, the two-dimensional discrete cosine transform method of the image block, the quantization and inverse quantization of the transform coefficient block method, entropy coding method of coefficient blocks, two-dimensional inverse discrete cosine transform method of coefficient blocks, and method of synthesizing a complete image with compressed image blocks, etc. For the specific description process, see "JPEG (Joint Photographic Experts Group): ISO / IEC IS 10918 –1 / ITU-T Recommendation T.81, Digital Com...

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Abstract

The invention belongs to the field of image processing, and provides a deblocking filter method based on the second-order gradient of the image, which uses the second-order gradient characteristics of the pixels on both sides of the compressed image block boundary to reasonably adjust the compressed pixels, thereby realizing The smoothing of image block boundaries can effectively remove the block effect existing in image compression. At the same time, the filtering method of the present invention makes full use of the second-order gradient change characteristics of the image block boundary, thereby effectively retaining the original features of the image and preventing the loss of image detail information caused by filtering. The filtering method of the present invention has high application value in the actual processing of compressed images because of its low computational complexity and obvious effect.

Description

technical field [0001] The invention belongs to the field of image processing, and relates to a deblocking effect filtering method based on the second-order gradient of an image, which is used for removing the block effect existing in compressed images. Background technique [0002] Image compression technology brings great convenience to the storage and transmission of images on device terminals, but for massive image data, the compression rate of lossless image compression is far from enough. Therefore, in most cases, image Compression uses lossy compression. Lossy compression introduces a certain amount of distortion in exchange for a higher compression ratio. [0003] Since the discrete cosine transform has nothing to do with the input signal and there is a fast implementation algorithm, and the performance of the discrete cosine transform is close to the K-L transform with the best decorrelation performance, the discrete cosine transform is widely used in image and vid...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/86
CPCH04N19/86
Inventor 朱树元何志应张世彦曾兵
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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