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Image processing method and device

An image processing device and image processing technology, applied in the field of image processing, can solve problems such as excessive sub-image block ratio stretching, poor image restoration effect, etc., and achieve good defogging effect

Inactive Publication Date: 2015-03-25
SUZHOU UNIV
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Problems solved by technology

[0007] In view of this, the present application provides an image processing method and device, which are used to solve the problem that the existing dark channel prior defogging algorithm is not effective in image recovery in dense fog weather, and the CLAHE algorithm is not good for each sub-image after division. The block sets a unified cropping threshold, which causes the problem that the contrast of sub-image blocks is stretched too large or too small

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Embodiment Construction

[0056] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0057] see figure 2 , figure 2 It is a flowchart of an image processing method disclosed in the embodiment of this application.

[0058] like figure 2 As shown, the method includes:

[0059] Step 200, acquiring the image to be tested;

[0060] Step 210, judging whether the image to be tested is dense fog, if so, execute step 220;

[0061] Specifically, the images to be tested may be captured under different weather conditions. We...

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Abstract

The invention discloses an image processing method and device. The method includes the steps that fog conduction judgment is conducted on an image to be detected, when it is judged that the image is collected in a heavy fog day, and the image to be detected is divided into a plurality of sub image blocks. For each sub image block, histogram clipping is conducted through a contrast limited adaptive histogram equalization (CHAHE) algorithm, and the clipping threshold value of each sub image block is obtained through a formula (please see the formula in the specification), wherein the Tc, x represents the chipping threshold value of the sub image blocks omega (x) with the x as the center, and the size being M*N, the Tc, max is the maximum chipping threshold value, and the is the average value of the atmospheric transmission rates corresponding to all pixel points in the sub image blocks omega (x). According to the image processing method and device, the situation that the atmospheric transmission rates of all the pixel points in different sub image blocks are different is considered, and different chipping threshold values are set for different sub images, so that the ideal defogging effect of all the sub image blocks is achieved, and the good defogging effect of the finally combined image is achieved.

Description

technical field [0001] The present application relates to the technical field of image processing, and more specifically, to an image processing method and device. Background technique [0002] Image processing technology is used in various fields of modern life, among which it is more commonly used in license plate recognition systems. The license plate recognition process can be divided into five parts: vehicle image acquisition, image preprocessing, license plate location, character segmentation and character recognition. In the process of implementation and use, due to frequent encounters with fog and haze, the quality of the acquired vehicle images is poor, which brings great obstacles to the subsequent license plate location and recognition, and even leads to the complete failure of the recognition system. [0003] The existing image defogging methods usually use the dark channel prior defogging algorithm. This algorithm restores the color of the image with a less ser...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/40
Inventor 徐汀荣兰溪
Owner SUZHOU UNIV
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