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A Polarization Image Restoration Method Based on Local Histogram Stretching

A technology of histogram stretching and polarization image, which is applied in image enhancement, image analysis, image data processing, etc., can solve the problem of general effect of strong scattering medium, and achieve the improvement of dehazing restoration quality, obvious effect and image quality improvement. Effect

Active Publication Date: 2021-07-27
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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  • A Polarization Image Restoration Method Based on Local Histogram Stretching
  • A Polarization Image Restoration Method Based on Local Histogram Stretching
  • A 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, step 1, obtaining the orthogonal polarization state I || and I ⊥ The two color three-channel light intensity maps below are calculated to obtain the original light intensity map I and the degree of polarization P; step 2, calculate I ⊥ Corresponding color three-channel histogram under the state, select the local stretching part in described color three-channel histogram [I ⊥‑Low ,I ⊥‑High ], for I ⊥ The light intensity map in the state is stretched in gray value; step 3, the selected local histogram is stretched to obtain the light intensity map I after stretching correction ⊥‑str ; Step 4, obtain the processed I according to the degree of polarization P || Light intensity map I under state ||‑str ; Step 5, the processed orthogonal polarization diagram I ⊥‑str and I ||‑str Perform summation to obtain the restored light intensity map I str ; Step 6, to restore light intensity map I str Perform color correction to obtain the final restoration image I pro . Compared with the traditional restoration method, the quality of the restored image obtained by the present invention is significantly improved, and the definition of the restored image can be significantly 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 Patents(China)
IPC IPC(8): G06T5/00
CPCG06T5/003G06T2207/10024
Inventor 胡浩丰刘铁根李校博韩佳慧
Owner TIANJIN UNIV
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