Haze image medium transmission rate estimation and optimization method based on quick gaussian filtering

A medium transfer rate and Gaussian filtering technology, which is applied in the field of medium transfer rate estimation and optimization of haze images, and can solve problems such as inability to apply real-time systems, slow optimization speed, and slow dehazing speed.

Inactive Publication Date: 2013-07-31
CHENGDU CORPRO TECH CO LTD
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a novel method for estimating and optimizing the medium transmission rate of haze images based on fast Gaussian filtering, in which the atmospheric light value is calculated in the dark channel...

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  • Haze image medium transmission rate estimation and optimization method based on quick gaussian filtering
  • Haze image medium transmission rate estimation and optimization method based on quick gaussian filtering
  • Haze image medium transmission rate estimation and optimization method based on quick gaussian filtering

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[0060] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0061] The medium transmission rate estimation and optimization method of haze images based on fast Gaussian filtering is not only applicable to the processing of haze images, but also applicable to the processing of haze video files.

[0062] When the atmosphere is homogeneous, the monochromatic atmospheric scattering model under haze weather conditions is expressed by the following formula:

[0063] I(x)=J(x)t(x)+A(1-t(x))

[0064] Among them, I(x) represents the brightness of the observed image, J(x) represents the scene radiance of the fog-free image that needs to be restored, A represents the overall atmospheric light value, and represents the medium transmission rate;

[0065] J(x)t(x) is the direct attenuation term, which is used to...

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Abstract

The invention discloses a haze image medium transmission rate estimation and optimization method based on quick gaussian filtering. The method comprises the steps of estimation of a transmission rate and quick gaussian filter optimization of the transmission rate; the whole defogging flow comprises the steps that the minimum value is taken from three color values of each pixel point; a minimum value luminance diagram is obtained; the adjacent minimum value of each pixel point is obtained in the minimum value luminance diagram; a dark channel image is obtained; an average value of 0.1% of maximum gray scale pixels in a dark channel is selected as an atmospheric light value; a transmission image is computed according to the dark channel image; a transmission diagram is refined by adopting a quick gaussian filter; and a fogging imaging model is brought into to recover a fog-free scene. The method adopts a recurrence gaussian filtering method to optimize the transmission rate, so that an optimization result is good, and the method can be quickly achieved by adopting a programmable logic device.

Description

technical field [0001] The invention relates to a method for estimating and optimizing medium transmission rate of haze images based on fast Gaussian filtering. Background technique [0002] In the field of computer vision, the sharpening of images in foggy scenes is an important issue, which is crucial for subsequent operations such as visual interpretation and computer vision analysis. In the range of visible light imaging, due to the influence of fog, dust and other particles in the atmosphere, as the transmission distance increases, the light reflected by the object and reaching the photosensitive sheet of the camera is very weak, making the image blurred, especially in foggy weather. Visibility is very low, and the haze of images taken in foggy weather is even more serious. Therefore, it is of great practical significance to restore the weak details of the image by means of dehazing. [0003] At present, in the field of computer vision, there are roughly two methods f...

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Application Information

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IPC IPC(8): G06T5/00
Inventor 刘军肖然何琦宋博
Owner CHENGDU CORPRO TECH CO LTD
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