Nighttime image enhancing method with highlight inhibition

An image enhancement and image technology, which is applied in closed-circuit television systems, color signal processing circuits, etc., can solve the problems of not effectively suppressing the highlight area and affecting the detail display of the highlight area, and achieve the effect of improving the contrast

Inactive Publication Date: 2010-07-21
XIAN UNIV OF TECH
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Problems solved by technology

[0003] The purpose of the present invention is to provide a nighttime image enhancement method with highlight suppression, which solves the problem in the prior art that the highlight area is not effectively suppressed, which seriously affects the detail display of the highlight area near the light source

Method used

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  • Nighttime image enhancing method with highlight inhibition
  • Nighttime image enhancing method with highlight inhibition
  • Nighttime image enhancing method with highlight inhibition

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Embodiment Construction

[0012] The present invention will be described in detail below in combination with specific embodiments.

[0013] The nighttime image enhancement method with highlight suppression of the present invention is implemented according to the following steps:

[0014] Step 1. Convert the color system of the input night image

[0015] In order to better maintain the color information of the image, during the initialization process, the input night image is converted from the RGB color system to the HSV color system, the H and S channel information of the color information is retained, and only the brightness channel V is processed. Since color system conversion is a prior art, it will not be repeated here.

[0016] Step 2. Perform pre-enhancement processing on the converted image in step 1

[0017] For the night image under the HSV color system processed in the previous step, the Retinex enhancement method based on the time-domain recursive filter is used. The Retinex enhancement m...

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Abstract

The invention discloses a nighttime image enhancing method with high light inhibition, which comprises the following steps: step 1, converting the color system of an image from an RGB color system to an HSV color system, reserving H and S channel information in the color information, and only processing a brightness channel V; step 2, pre-enhancing the image; step 3, determining inhibition parameters including an inhibited template and a shim range, and then inhibiting a highlight area; step 4, widening a histogram, redistributing the grey level of the image pixel by using an empty gray level generated in highlight inhibition to widen the histogram; and step 5, normalizing the image, and then converting from the HSV color system to the RGB color system for displaying to obtain the enhanced nighttime image. The method of the invention can effectively enhance the nighttime image, inhibits highlights in the image, and improves the contrast ratio of the image to the uttermost extent without changing the relation of the original image pixels, so that the image can express the maximum information amount.

Description

technical field [0001] The invention belongs to the technical field of video monitoring, and relates to a nighttime image enhancement method with highlight suppression. Background technique [0002] The enhancement of nighttime images is an important part of completing the normal work of the intelligent monitoring system at night. Considering that the lighting environment at night is relatively complex, images captured by ordinary cameras or video cameras generally have high-light areas caused by strong light sources. The existence of these high-light areas , so that the dynamic range of the captured image is too large, resulting in too dark images, uneven illumination, and strong light interference in the scene picture, and the impact of noise is large, especially strong light sources (such as car lights, flashlights) Enhancements to nighttime images pose additional difficulties. However, although the current image enhancement method has a good effect on enhancing the deta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/64H04N7/18
Inventor 朱虹王文静刘薇宁婷婷邢楠
Owner XIAN UNIV OF TECH
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