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Apparatus and method for increaring contrast ratio using histogram match

A device and contrast enhancement technology, which is applied in the field of contrast devices, can solve problems such as difficult devices and unreliable edges, and achieve the effect of avoiding overemphasis and easy contrast enhancement devices

Inactive Publication Date: 2003-08-27
SAMSUNG ELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to overcome the above disadvantages, complex algorithms have been proposed, but it is difficult to implement such a device
[0011] At the same time, 6 with conventional contrast stretching techniques, if there are bright or dark parts in the image, the stretched edges become unreliable, making it difficult to expect a good result

Method used

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  • Apparatus and method for increaring contrast ratio using histogram match
  • Apparatus and method for increaring contrast ratio using histogram match
  • Apparatus and method for increaring contrast ratio using histogram match

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Embodiment Construction

[0057] Reference will now be made in detail to embodiments of the invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like parts throughout. In order to illustrate the invention, the invention will be described with reference to the accompanying drawings

[0058] Example.

[0059] figure 2 is a block diagram of a contrast enhancement device 200 according to an aspect of the present invention.

[0060] see figure 2 , the contrast enhancement device 200 includes a first operation part 210 , a second operation part 220 , a transformation part 230 , and a transformation range designation part 240 .

[0061] The first operation part 210 calculates the average value and standard deviation of the input image. The second operation part 220 calculates the average value and standard deviation of the target image from the average value and standard deviation of the input image. The second operation part 220 calculates...

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Abstract

An apparatus and method to enhance a contrast includes a first operation part, a second operation part, and a mapping part. The first operation part calculates an average and a standard deviation of an input image. The second operation part calculates an average and a standard deviation of a target image based on the average and the standard deviation of the input image. The mapping part converts a pixel value of the input image by a mapping function generated by receiving the averages and the standard deviations of the input image and the target image from the first operation part and the second operation part, respectively, and outputs a pixel value of an output image.

Description

[0001] This application claims priority to Korean Patent Application No. 2002-6832 filed in the Korean Intellectual Property Office on February 6, 2002, which is incorporated herein by reference. technical field [0002] The present invention relates to a device and method for enhancing contrast by using histogram matching, in particular to a device and method for enhancing the contrast of an output image by using a transformation table written according to the distribution of an input image and a target image. Background technique [0003] A histogram is used to represent the distribution of contrast values ​​of an image pixel. In other words, a histogram describes the distribution and values ​​of bright and dark spots present in an image. Smoothing of the histogram can make the distribution of contrast values ​​of a deviated or non-uniform image uniform, thus enhancing the image. Through the smoothing of the histogram, dark images are brightened, and images that are too b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06K9/00G06T5/40G09G3/20H04N1/407H04N5/20
CPCG06T2207/20216G06T5/50G06T5/009G06T5/40
Inventor 吴才焕梁承埈
Owner SAMSUNG ELECTRONICS CO LTD
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