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Image sharpening method and device

An image sharpening and image technology, applied in image enhancement, image analysis, image data processing and other directions, can solve the problem that the gain of sharpening enhancement cannot conform to the enhancement function, cannot improve the visual effect of the image, and does not use the visual characteristics of the human eye.

Active Publication Date: 2022-08-02
INFORMATION SCI RES INST OF CETC
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Problems solved by technology

However, neither the traditional unsharp mask method nor the improved unsharp mask method based on the gain coefficient takes advantage of the visual characteristics of the human eye, and the sharpening enhancement gain cannot conform to the enhancement function of the human visual characteristic, so it cannot Improve the visual effect of the image subjectively

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Embodiment Construction

[0052] In order for those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0053] like figure 1 As shown, an image sharpening method S100 includes:

[0054] Step S110, convert the image frame to be sharpened from the RGB color space to the YUV color space, and perform Gaussian low-pass filtering on the Y luminance component to obtain the Y luminance low-pass component Y low, for the Y luminance component and the Y luminance low-pass component Y low Find the difference to get the high-frequency component Y of the Y brightness hig ;

[0055] Step S120: Perform filtering processing on the Y luminance component according to a preset filter operator to obtain the Y luminance image background Y bg ;

[0056] Step S130: Calculate the image gradient map of the Y brightness component according to the preset...

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Abstract

An image sharpening method and device according to an embodiment of the present invention includes: converting an image frame to be sharpened from an RGB color space to a YUV color space, and performing Gaussian low-pass filtering on a Y luminance component to obtain a Y luminance low-pass component, Calculate the difference between the Y luminance component and the Y luminance low-pass component to obtain the Y luminance high-frequency component; filter the Y luminance component according to the preset filtering operator to obtain the Y luminance image background; calculate the Y luminance according to the preset gradient operator The image gradient map of the component, and the image texture map of the Y brightness component is obtained according to the image gradient map; according to the Y brightness image background and the Y brightness image texture map, the Y brightness minimum perceptible difference image is calculated; based on the Y brightness minimum perceptible difference image and Y luminance high-frequency components, calculate the gain coefficient; calculate the sharpened image according to the gain coefficient. The image sharpening method of the present invention can enhance image details and avoid noise enhancement; the obtained gain coefficient is more in line with the visual characteristics of human eyes.

Description

technical field [0001] The invention belongs to the technical field of digital image processing, in particular to an image enhancement method and device, and in particular to an image sharpening method and device. Background technique [0002] Due to the influence of imaging equipment, external conditions or transmission process, it is unavoidable that the quality of the acquired image is often degraded, and the image presents the characteristics of low contrast and blurred edge details. This creates difficulties for applications based on image analysis. Image sharpening uses image processing technology to improve the visual effect of the image, enhance the details and image contrast, and transmit more information to the computer vision system to complete the accurate identification and detection of the region of interest, while reducing the observer's Fatigue. [0003] The purpose of image sharpening is to enhance the sharpness of image edges and details, and one of the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T7/90
CPCG06T7/90G06T2207/20024G06T5/73G06T5/70
Inventor 高原原张峰王子玮刘灵芝
Owner INFORMATION SCI RES INST OF CETC
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