Wavelet domain Retinex image defogging method

A wavelet domain and image technology, applied in the field of wavelet domain Retinex image defogging, can solve the problems of loss of detail information, large amount of calculation, blurred image edges, etc.

Inactive Publication Date: 2016-02-03
BEIJING UNIV OF TECH
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Problems solved by technology

[0003] The existing methods have shortcomings: on the one hand, the traditional Retinex algorithm uses a Gaussian filter to estimate the illumination component of the image, which tends to cause the edge of the processed image to be blurred, the image is dim, the details are lost, and the color is easily distorted; on the other hand, the color The R, G, and B channels of the image are processed separately, which requires a large amount of calculation and low efficiency

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  • Wavelet domain Retinex image defogging method
  • Wavelet domain Retinex image defogging method
  • Wavelet domain Retinex image defogging method

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[0053] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0054] Such as figure 1 As shown, the wavelet domain Retinex image defogging algorithm of the embodiment of the present invention comprises the following steps:

[0055] Step S1, transform the image into HSV color space.

[0056] In an embodiment of the present invention, firstly, an image signal containing noise, that is, an image g containing fog, is read. Then, convert the image g from the RGB color space to the HSV color space, and obtain the chroma component H, saturation component S and brightness component V of the image g.

[...

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Abstract

The invention discloses a wavelet domain Retinex image defogging method, so as to improve the Retinex algorithm defogging effects and improve the algorithm efficiency. The method comprises the following steps: the image is transformed into HSV color space; wavelet transformation is carried out on a brightness component V, and a low-frequency subband in which a fog component is and a high-frequency subband in which noise and edge information are are acquired; the improved single-scale Retinex algorithm is used for processing the low-frequency subband, and a wavelet threshold method is used for processing the high-frequency subband; wavelet inverse transformation is carried out, and a reconstructed brightness component is acquired; a saturation component S is adaptively adjusted according to changes of the brightness component V; and according to each HSV color space component after change, a clear image after defogging is reconstructed. The defogging algorithm designed by the invention can effectively improve degeneracy of a foggy image, definition of the image is improved, and the processing efficiency is enhanced obviously.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a wavelet domain Retinex image defogging method. Background technique [0002] At present, the processing methods for foggy images are mainly divided into two categories: foggy image restoration and foggy image enhancement. The enhancement method of foggy images does not consider the reasons for image degradation, but is based on subjective visual experience. It can effectively improve the contrast of foggy images, highlight the details of images, and improve the visual effect of images. It has a wide range of applications. Information may result in certain losses. The method of defogging based on image enhancement is more widely used because of its simplicity and effectiveness. Common image defogging methods based on image enhancement include histogram equalization method, homomorphic filtering, etc., but these methods do not make good use of human visual characterist...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 刘芳付凤之周慧娟路丽霞
Owner BEIJING UNIV OF TECH
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