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Bilateral filter-based single image defogging method

A bilateral filtering and single image technology, applied in image enhancement, image data processing, instruments, etc., can solve the problems of false halo effect, improper parameter setting, etc.

Inactive Publication Date: 2014-01-01
DALIAN UNIV OF TECH
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Problems solved by technology

However, since the mean filter is not a good edge-preserving filter, it often causes false halo effects due to improper parameter settings.

Method used

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  • Bilateral filter-based single image defogging method
  • Bilateral filter-based single image defogging method
  • Bilateral filter-based single image defogging method

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Embodiment Construction

[0062] The present invention will be described in detail below with reference to specific embodiments and drawings.

[0063] A. Find the fogged image (see attached Figure 4 (a) shows the dark channel map, and estimate the atmospheric light intensity:

[0064] A1. For the three color channels of R, G, and B of the fogged image, perform the minimum filter with a template size of 15×15, and use the minimum value of each pixel on the three channels after filtering as the dark channel image For the specific operation, see formula (1).

[0065] A2. Select the largest 0.1% pixel point in the dark channel image, and select the maximum value of these points in the original foggy image as the atmospheric light intensity A estimate of the entire image. The atmospheric light value of FIG. 5(a) thus obtained is 246.

[0066] B. Use two bilateral filtering to estimate the atmospheric dissipation function. The flow diagram of the method is shown in the attachment figure 2 Shown:

[0067] B1. Obta...

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Abstract

The invention discloses a bilateral filter-based single image defogging method. The bilateral filter-based single image defogging method is used for reasonably restoring degraded images influenced by hazy weather. The bilateral filter-based single image defogging method comprises the following steps: gaining a dark channel picture of an original atomization image so as to obtain atmosphere light intensity; estimating an atmosphere dissipative function by utilizing two times of bilateral filtering; obtaining a medium propagation function by using the arithmetic expression of the atmosphere dissipative function; weakening a local bright area; obtaining a clear image by using an atmospheric scattering model. The bilateral filter-based single image defogging method can be used for restoring the scenery information of the atomization image clearly and naturally and improving the visual effect of the image; the method is simple in complexity and high in running speed, thus good application value is supplied for a real-time monitoring system.

Description

Technical field [0001] The present invention belongs to the technical field of image information processing. The present invention is a single image defogging method based on bilateral filtering, which is suitable for restoring degraded images taken under haze weather. Background technique [0002] Many outdoor monitoring systems used by computers require accurate extraction of image features. In weather conditions such as fog, haze, etc., due to the scattering of tiny particles in the atmosphere, the quality of the acquired images is severely degraded, which not only affects the images. It also interferes with the extraction of image features and makes the outdoor monitoring system unable to operate normally, which brings serious security risks. Therefore, the use of an effective and fast defogging method to make the fogged image clear has important practical significance. [0003] The existing image defogging methods are mainly divided into two categories: one is a processing me...

Claims

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Application Information

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IPC IPC(8): G06T5/00
Inventor 王洪玉王一帆尹传力黄义明
Owner DALIAN UNIV OF TECH
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