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Image sharpening method and device

An image sharpening and image technology, which is applied in image enhancement, image analysis, image data processing, etc., can solve the problems that the gain of sharpening enhancement cannot conform to the enhancement function, the visual characteristics of the human eye are not used, and the visual effect of the image cannot be improved.

Active Publication Date: 2020-02-14
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 to enable 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 in conjunction with the accompanying drawings and specific embodiments.

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

[0054] Step S110, converting the image frame to be sharpened from the RGB color space to the YUV color space, and performing Gaussian low-pass filtering on the Y brightness component to obtain the Y brightness 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 Y brightness high frequency component Y hig ;

[0055] Step S120, filter the Y luminance component according to the 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 gradient o...

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Abstract

The embodiment of the invention discloses an image sharpening method and device. The method comprises the steps of converting a to-be-sharpened image frame from an RGB color space to a YUV color space, performing Gaussian low-pass filtering on a Y brightness component to obtain a Y brightness low-pass component, and performing subtraction on the Y brightness component and the Y brightness low-passcomponent to obtain a Y brightness high-frequency component; filtering the Y brightness component according to a preset filtering operator to obtain a Y brightness image background; calculating an image gradient map of the Y brightness component according to a preset gradient operator, and obtaining an image texture map of the Y brightness component according to the image gradient map; calculating to obtain a Y brightness minimum visual difference image according to the Y brightness image background and the Y brightness image texture map; calculating a gain coefficient based on the Y brightness minimum perceptible difference image and the Y brightness high-frequency component; and calculating the sharpened image according to the gain coefficient. Image details can be enhanced and noise enhancement can be avoided; and the obtained gain coefficient is more consistent 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, 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 inevitable that there will often be a problem of degradation in the quality of the acquired image, and the image presents the characteristics of low contrast and blurred edge details. This poses 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 can 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 attention. fatigue. [0003] The purpose of image sharpening is to enhance the sharpness of ima...

Claims

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Application Information

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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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