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Image sharpening device and method

An image sharpening and image technology, applied in image communication, electrical components, etc., can solve problems such as inability to distinguish image edges and noise, amplify image noise, and image quality degradation

Inactive Publication Date: 2008-06-11
QUANTA COMPUTER INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, traditional image sharpening methods cannot distinguish image edges from noise
Therefore, the traditional image sharpening method not only increases the sharpness of the image, but also amplifies the noise in the image, resulting in a decrease in the overall image quality

Method used

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Embodiment Construction

[0026] The image sharpening device of the embodiment of the present invention is used to enhance the sharpness of the original image. Since both the edge signal and the noise are high-frequency signals, only the edge enhancement processing is required for the high-frequency signal. The image sharpening device of the embodiment of the present invention decomposes the original image into low-frequency images and high-frequency images, and determines how to adjust the high-frequency images according to the edge strength of the original image and the distribution of noise. For areas with weak edge strength in the original image (for example, values ​​smaller than the preset noise standard deviation), since this area contains a large number of noise components, the intensity corresponding to this area is reduced (that is, the noise is suppressed). And for an area in the original image where the edge strength is sufficiently strong (for example, a value greater than a preset noise s...

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Abstract

The invention discloses an image sharpening device used to sharpen original images. The image sharpening device comprises a low-pass filter, a high-pass filter, an edge detector, a sharpening parameter generating unit and an operation unit. The low-pass filter and the high-pass filter as well as the edge detector respectively receive the original image and respectively output a low-frequency image, a high-frequency image and a plurality of edge detection values correspondingly. The sharpening parameter generating unit receives the plurality of edge detection values and respectively outputs a plurality of corresponding sharpening parameters. The operation unit adjusts the high-frequency image according to the sharpening parameters, outputs the adjusted high-frequency image, and combines the adjusted high-frequency image with the low-frequency image to obtain the output image with a sharpened image.

Description

technical field [0001] The present invention relates to an image sharpening device, and in particular to an image sharpening device for increasing image sharpness according to image edge strength. Background technique [0002] The digital images obtained by various optical components, such as cameras or scanners, are often caused by various factors, such as poor design of optical components or digital image processing, or shaking of the camera during the process of acquiring images. Its sharpness is reduced. Therefore, it is often necessary to sharpen the digital image to increase the sharpness of the image. Traditional image sharpening methods, such as unsharp masking, increase the sharpness by locally brightening the lighter parts of the edge region and locally darkening the darker parts of the edge region. The sharpness of the image. However, traditional image sharpening methods cannot distinguish image edges from noise. Therefore, the traditional image sharpening met...

Claims

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Application Information

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IPC IPC(8): H04N1/409H04N1/58
Inventor 何升峰
Owner QUANTA COMPUTER INC
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