Image enhancement method and device

An image enhancement and image technology, which is applied in the field of image processing, can solve problems such as poor noise filtering ability and poor image enhancement effect, and achieve the effects of enhancing image contrast, expanding dynamic range, and improving display effect

Active Publication Date: 2017-06-13
湖南兴芯微电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the image enhancement method using low-pass filtering and histogram equalization retains the noise existing in the high-frequency component, the noise filtering ability is poor, and the image enhancement effect is poor.

Method used

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  • Image enhancement method and device

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Experimental program
Comparison scheme
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Embodiment 1

[0046] Figure 1a It is a flowchart of an image enhancement method provided by Embodiment 1 of the present invention. The technical solution of this embodiment can be applied to the situation of enhancing images. The method can be executed by an image enhancement device provided in an embodiment of the present invention, and the device can be implemented in software and / or hardware. The method specifically includes the following operations:

[0047] S110. Extract brightness component data of the image and component data other than the brightness component data in a color space corresponding to the brightness component data.

[0048]The brightness component data of the image is particularly important for improving the contrast of the image. In order to improve the contrast of the image without changing the data of other channels of the image, such as hue or saturation, it is necessary to change the brightness data of the image, so the brightness component data of the image ne...

Embodiment 2

[0072] Figure 2a It is a flowchart of an image enhancement method provided by Embodiment 2 of the present invention. Embodiment 2 of the present invention optimizes the homomorphic filtering function on the basis of the foregoing embodiments.

[0073] Correspondingly, the method of this embodiment includes:

[0074] S210. Extract brightness component data of the image and component data other than the brightness component data in a color space corresponding to the brightness component data.

[0075] S220. Perform homomorphic filtering on the brightness component data, and a function of the homomorphic filtering is expressed as:

[0076]

[0077] Among them, r H is the high frequency gain, r L is the low-frequency gain, a and b are the dynamic adjustment factors, γ is used to control the sharpening of the slope of the filter and r L H , D(u,v) is the Euclidean distance from the current coordinate point to the center of the rectangle in the frequency domain, D 0 is the...

Embodiment 3

[0098] image 3 It is a structural block diagram of an image enhancement device provided in Embodiment 3 of the present invention. The device is configured to implement an image enhancement method provided in any of the above embodiments. The unit includes:

[0099] A component data extraction module 310, configured to extract brightness component data of an image and component data other than the brightness component data in a color space corresponding to the brightness component data;

[0100] A homomorphic filtering module 320, configured to perform homomorphic filtering on the brightness component data;

[0101] The CLAHE module 330 is configured to perform limited contrast adaptive histogram equalization CLAHE on the brightness component data after the homomorphic filtering;

[0102] A guided filtering module 340, configured to perform guided filtering on the luma component data after CLAHE, to obtain luma component data after filtering and denoising;

[0103] The enh...

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Abstract

The embodiment of the invention discloses an image enhancement method and device. The method comprises the steps that brightness component data of images and component data in the color space corresponding to the brightness component data except the brightness component data are extracted; homomorphic filtering is conducted on the brightness component data; contrast-limited adaptive histogram equalization (CLAHE) is conducted on the brightness component data obtained after homomorphic filtering; guide filtering and noise reduction are conducted on the brightness component data obtained after CLAHE to obtain filtered brightness component data; according to the filtered brightness component data and the component data in the color space corresponding to the brightness component data except the brightness component data, enhanced images are synthesized, the dynamic range of the images is effectively widened based on image detail keeping and image noise control, the image contrast is enhanced, meanwhile cloud and mist removal can be effectively achieved, and an image display effect is improved.

Description

technical field [0001] Embodiments of the present invention relate to image processing technologies, and in particular, to an image enhancement method and device. Background technique [0002] Image enhancement is the core technical part in the field of image processing. The purpose is to highlight image details, enhance image contrast, brightness, etc., thereby improving image clarity, improving image visual effects, enriching image information, and removing clouds and fog. It is a popular research field in the field of image enhancement and has great research value. Image enhancement methods can be divided into two categories: based on the spatial domain and based on the frequency domain. The spatial domain method can be generally understood as a method of directly processing image pixels, and the image enhancement effect is achieved by changing the gray value of the image pixel. This method was proposed earlier, and the development is relatively mature. , histogram proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
CPCG06T5/002G06T5/007G06T2207/10004G06T2207/10024G06T2207/20024
Inventor 周晨航
Owner 湖南兴芯微电子科技有限公司
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