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Polarization image restoration method based on local histogram stretching

A histogram stretching and polarizing image technology, which is applied in image enhancement, image analysis, image data processing, etc., can solve the problems of general effects of strong scattering media, improve the quality of defogging and restoration, improve image quality, and have a wide range of applications Effect

Active Publication Date: 2018-11-06
TIANJIN UNIV
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Problems solved by technology

[0003] Histogram stretching is a simple and effective digital method for image contrast enhancement, but the traditional histogram stretching method has limitations for the restoration of color three-channel scattering media imaging, especially for strong scattering media.

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  • Polarization image restoration method based on local histogram stretching
  • Polarization image restoration method based on local histogram stretching
  • Polarization image restoration method based on local histogram stretching

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Embodiment Construction

[0035] Theoretical basis of the present invention: Most of the existing foggy image restoration methods based on histogram stretching are based on the whole space, and directly stretch the pixel distribution histogram of the three channels. This traditional histogram stretching technology is used in many scenes In general, especially in the environment of high-concentration scattering medium, the image restoration effect is mediocre. This is because there are a lot of pixel values ​​in the three-channel histogram containing the fog image and the number is very small, which virtually extends the range of the original histogram, but these pixel values ​​often have little effect on image recognition and restoration. In fact, if only the pixel values ​​that account for the majority of the histogram distribution are stretched, theoretically better restoration results can be achieved.

[0036] Because orthogonally polarized images can adjust the imaging quality of scattering media, ...

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Abstract

The invention discloses a polarization image restoration method based on local histogram stretching. The method comprises the steps of 1, obtaining two color three-channel light intensity images in orthogonal polarization states I|| and I(perpendicular to), and performing calculation to obtain an original light intensity image I and a polarization degree P; 2, calculating a corresponding color three-channel histogram in the state I(perpendicular to), selecting a local stretching part [I(perpendicular to)-Low, I(perpendicular to)-High] in the color three-channel histogram, and carrying out grayvalue stretching for the light intensity image in the state I(perpendicular to); 3, stretching the selected local histogram to obtain a light intensity image I(perpendicular to)-str after stretchingcorrection; 4, according to the polarization degree P, obtaining a processed light intensity image I||-str in the state I||; 5, performing summation on the processed orthogonal polarization images I(perpendicular to)-str and I||-str to obtain a restored light intensity image Istr; and 6, performing color correction on the restored light intensity image Istr to obtain a final restored image Ipro. Compared with a conventional restoration method, the quality of the restored image obtained by the method is improved remarkably, and the definition of the restored image can be remarkably improved.

Description

technical field [0001] The invention relates to an image defogging and restoration method, in particular to a polarization image restoration method based on local histogram stretching. Background technique [0002] As one of the basic physical information of light waves, polarization information can provide information about the measured object that other light wave information cannot provide. Polarization imaging technology is a new type of optical detection technology developed based on this idea, especially in strong scattering environments. The goal of polarization imaging technology is to detect and identify unique advantages and special applications that are unmatched by other imaging methods. [0003] Histogram stretching is a simple and effective digital method for image contrast enhancement, but the traditional histogram stretching method has limitations for the restoration of color three-channel scattering medium imaging, especially for strong scattering medium. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
CPCG06T2207/10024G06T5/73
Inventor 胡浩丰刘铁根李校博韩佳慧
Owner TIANJIN UNIV
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