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Method for simutaneously suppressing undershoot and over shoot for increasing digital image

A technology for enhancing images and images, applied in the field of enhancing digital images while suppressing undershoot and overshoot, and can solve problems such as annoying, visible and annoying

Inactive Publication Date: 2003-06-25
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Most detail enhancement methods come with the following known issues: Overshoot and undershoot as a result of the enhancement
exist Figure 2B Overall detail and sharpness have been significantly improved in the image shown, but this image clearly shows that the blow-out caused by the detail enhancement process is visually undesirable and annoying
Typically, the effect becomes more visible and annoying if the image is displayed on a large display device such as a large-screen TV

Method used

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  • Method for simutaneously suppressing undershoot and over shoot for increasing digital image
  • Method for simutaneously suppressing undershoot and over shoot for increasing digital image
  • Method for simutaneously suppressing undershoot and over shoot for increasing digital image

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Embodiment Construction

[0022] The present invention will first be described with respect to a method for enhancing a digital image while preventing or suppressing the occurrence of horizontal blow-out. However, the present invention is also applicable to enhancing digital images while preventing or suppressing the occurrence of vertical blow-out.

[0023] In order to systematically describe the present invention, some mathematical notations will be introduced. When obtaining digital image samples, the digital image is typically represented as a two-dimensional signal having horizontal and vertical indices whose function values ​​correspond to pixel values. That is, suppose {f} M×N Represents a digital image or digital picture composed of M×N digital pixels, where M and N represent height (the number of samples in the vertical direction, or the number of rows) and width (the number of samples in the horizontal direction) respectively. Then f(m, n) represents the nth pixel value of the mth row of th...

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Abstract

A method is provided for enhancing the details of an image while suppressing or preventing shoots that would otherwise occur during a prior art enhancement process. The enhancing method is based on recognizing that Shoots are likely to occur at edges of an image to be enhanced, and therefore, if the enhancement is sufficiently reduced or even possibly eliminated at the edges of the image, the Shoots that would otherwise occur will be suppressed or even possibly eliminated. A gain suppressing function is used to attenuate the enhancement at the edges of the image. Preferably, the gain suppressing function inherently identifies the edges of the image to be enhanced.

Description

technical field [0001] The present invention relates to methods for enhancing digital images while suppressing or preventing the undershoot and overshoot normally resulting from such enhancement. Background technique [0002] There are various methods of acquiring digital images based on current technology. For example, digital images can be acquired using a digital camera, a scanner, or can be downloaded from the Internet. Video signal capture systems also provide methods for acquiring digital image samples or video samples. Digital images are also available internally and processed in some multimedia devices such as DVD players and digital TV systems. [0003] Images tend to be degraded for a number of reasons and in order to obtain better quality these images need to be enhanced. Many image enhancement processes are known, and a specific one of these processes can be selected according to the degradation characteristics of the image. Local contrast enhancement improve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/57G06T5/00G06T5/20
CPCG06T5/20G06T5/004H04N1/4092G06T5/75H04N5/57
Inventor 金永铎
Owner SAMSUNG ELECTRONICS CO LTD