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Method for enhancing visual effect of image edge

A technology for enhancing images and visual effects, applied in the field of image processing, can solve problems such as signal distortion, affecting visual effects, large amount of data, etc., and achieve the effect of enhancing edge vision

Active Publication Date: 2008-02-06
HANGZHOU NATCHIP SCI & TECH
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Problems solved by technology

Traditional LTI methods include horizontal filtering, two-dimensional filtering, etc. Some of these methods are likely to cause signal distortion, such as horizontal filtering algorithms; some algorithms are too complex and cost too much to implement hardware, such as two-dimensional filtering algorithms
The invention patent with the application number US6580835 discloses an edge enhancement method based on the statistical characteristics of the local area of ​​the image. This method does not adjust the enhanced gain according to the position of the pixel on the edge, which will inevitably cause the edge of the enhanced image to fluctuate randomly. Affects the visual effect, and the method requires a large amount of data, which is not suitable for hardware implementation

Method used

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  • Method for enhancing visual effect of image edge
  • Method for enhancing visual effect of image edge
  • Method for enhancing visual effect of image edge

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Embodiment Construction

[0037] As shown in Figure 1, the input image first calculates the second-order filter value of the target pixel according to equation (1), and the specific obtaining method can refer to Figure 2 . Then judge the edge position where the target pixel is located. When judging, first use formula (2) to calculate the first-order difference of each pixel of the input image, and then use formula (3-1) and (3-2) to judge the target pixel according to the difference value of seven pixels adjacent to the target pixel horizontally Whether these pixels are on the edge of the same nature (this step can refer to Figure 3), and then take out all adjacent pixels that are on the edge of the same nature as the target pixel, and use formulas (4-1) and (4-2) to find and For the leftmost and rightmost pixel points where the target pixel is on the same edge, the position of the target pixel on the edge can be calculated by using formula (5). The calculation method can refer to Figure 4. Then use f...

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Abstract

This invention relates to a method for strengthening image edge visual result including the following steps: a, carrying out a second order filter computation to a target pixel, b, judging the position of the target pixel at the image edge, c, computing the edge increased gain according to the filter compute result and its edge position, d, computing the strengthened pixel value and protecting the result.

Description

technical field [0001] The invention belongs to the technical field of image processing, in particular to a method for enhancing the visual effect of image edges. Background technique [0002] Since the human eye is particularly sensitive to the edge of the image, enhancing the visual effect of the edge of the image can improve the definition of the image and make the image clearer and brighter. Furthermore, in the transmission process of the image signal, the edge information of the image belongs to the high-frequency part, which is easy to attenuate, so that the edge of the image displayed on the display device becomes more blurred and the visual effect is worse. Therefore, enhancing the visual effect of the edge of the image becomes a very important part of improving the image quality. [0003] Enhanced image edge visual effect is also called brightness transient improvement (Luminance Transient Improvement), referred to as LTI. Traditional LTI methods include horizonta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/208
Inventor 陈涛叶丰周艇张明
Owner HANGZHOU NATCHIP SCI & TECH
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