Image de-noising method and equipment

An image and image sub-block technology, applied in the field of communication, can solve the problems of poor texture information processing effect and affect the quality of image denoising, and achieve the effect of improving visual quality and improving PSNR value.

Inactive Publication Date: 2011-08-17
DATANG MOBILE COMM EQUIP CO LTD
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Problems solved by technology

[0012] Embodiments of the present invention provide an image denoising method and device, which solve the problem that the traditional wavelet threshold denoising has poor texture information processing effects in directions other than the vertical and horizontal directions, which affects the quality of image denoising

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  • Image de-noising method and equipment
  • Image de-noising method and equipment

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Embodiment Construction

[0032] As described in the background art, the traditional wavelet threshold denoising effect is good for smooth image denoising, but the denoising effect for images rich in texture information or texture regions of images is not satisfactory. This is because the traditional wavelet transform cannot realize the sparse representation of the texture image, and a large amount of texture information in the image is transformed into high-frequency sub-bands, which are easily mistaken for noise and removed during threshold denoising, resulting in the loss of information about the image itself. lost.

[0033] In order to overcome such defects, the technical solution proposed by the embodiment of the present invention judges the texture direction of the image through image interpolation, and then performs wavelet transformation along the determined direction. This direction-adaptive wavelet transform can transform the texture information of the image To the low frequency region, the t...

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Abstract

The embodiment of the invention discloses an image de-noising method and image de-noising equipment. According to the technical scheme of the embodiment, the image texture direction is judged by image interpolation, wavelet transform is performed along the judged direction, and the direction adaptive wavelet transform can transform the texture information of an image to a low-frequency area and protect the textures of the image from being lost in threshold value de-noising, so that the texture information of other directions except the vertical direction and the horizontal direction is processed, and compared with traditional wavelet threshold value de-noising, the visual quality and the peak signal-to-noise ratio (PSNR) value of the de-noised image with rich textures are improved obviously.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to an image denoising method and device. Background technique [0002] As a carrier of information, digital images play an important role in multimedia communication services. However, digital images will inevitably be polluted by noise during the process of collection, encoding, transmission, and restoration, which weakens the perception of human eyes on images to a certain extent. Therefore, how to effectively remove image noise is an important research topic, and the problem of image denoising with rich texture is a major difficulty in this topic. [0003] Among the existing solutions, the wavelet threshold image denoising scheme is a relatively common processing method. [0004] In the wavelet transform domain of noisy images, most of the image signal energy is concentrated in the wavelet coefficients with larger absolute values, while the noise energy is mainly ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 李重戬赵荣
Owner DATANG MOBILE COMM EQUIP CO LTD
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