Image restoration method based on physical scattering model

A scattering model and image restoration technology, applied in the field of image restoration based on physical parameters, can solve problems such as unclear images, achieve outstanding effects, stable performance, and natural image restoration effects

Pending Publication Date: 2022-02-11
SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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Problems solved by technology

2) Discover the limitations of the famous atmospheric light attenuation model, and solve the problem of unclear images caused by non-uniform illumination by proposing a completely different model method
3) The model is especially effective in solving images with high density scattering problems

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  • Image restoration method based on physical scattering model
  • Image restoration method based on physical scattering model
  • Image restoration method based on physical scattering model

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Embodiment Construction

[0053] The present invention will be further described in detail below in conjunction with the examples. The method steps are described with reference to the accompanying drawings.

[0054] A scattering model based on physical parameters, comprising the following steps:

[0055] 1. Use a uniform light source (such as an integrating sphere) to calibrate the vignetting of the camera and remove image noise;

[0056] 2. Establish a descattering mathematical model, divide the attenuated image into two parts, direct radiation and backscattering, and calculate them separately;

[0057] 3. Perform OSTU binarization processing on the collected pictures, fit some pixels of pure scattering and calculate parameters.

[0058] 4. Use the calculated parameters to remove backscatter and attenuation from the entire image.

[0059] The calibrated vignetting includes:

[0060]Establish a de-vignetting table corresponding to all focal lengths of the camera; use the look-up table method for th...

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Abstract

The invention relates to an image restoration method based on a real physical parameter scattering physical model. A new scattering model different from a general atmospheric light scattering model is established, a corresponding physical explanation can be given for each scattering environment, the relationship between the light source position and the scattering condition is elaborated, and the problem of scattering removal under non-uniform illumination is solved. The method comprises the following steps: firstly, removing a vignetting of a camera by using an integrating sphere, then finding out a pure scattering part through an improved dark channel-like prior method, and finally, calculating a zenith angle, an azimuth angle, an extinction coefficient and other related physical quantities according to light attenuation and back scattering distribution of a scattering medium to eliminate back scattering and light attenuation. Theoretically, the model can be used for any uniform scattering medium, such as underwater and fog environments, and works well in high-density media. The final experimental result shows that the model solves the problem of backward scattering removal under the strong scattering medium, is correct and effective, and has practical physical significance.

Description

technical field [0001] The invention relates to a scattering model, in particular to an image recovery method based on physical parameters, which explains the relationship between the light source position and backscattering. Background technique [0002] In recent years, advances in technology have allowed people to capture images and videos in highly scattering environments. However, removal of backscattering has been a persistent problem in practical engineering settings. Backscattering causes things like color distortion and blurring of the image. This severely affects the performance of standard computer vision algorithms, which are generally developed to work in clear air. Therefore, in order to obtain reasonable results using these algorithms, the image must first be descattered. The well-known atmospheric scattering model is based on the Beer-Lambert law: [0003] I(x)=J(x)t(x)+A(1-t(x)) (1) [0004] t(x)=e -σz (2) [0005] Among them, the atmospheric light A...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T7/50
CPCG06T5/002G06T5/003G06T7/50G06T2207/10016G06T2207/20024
Inventor 田建东周士筠张箴
Owner SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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