Apparatus and method for increasing contrast ratio using histogram match

A technology for enhancing device and contrast is applied in the field of contrast device, which can solve the problems of unreliable edge and difficult device, and achieve the effect of easy contrast enhancing device

A technology for enhancing device and contrast is applied in the field of contrast device, which can solve the problems of unreliable edge and difficult device, and achieve the effect of easy contrast enhancing device

CN1263278CInactive Publication Date: 2006-07-05SAMSUNG ELECTRONICS CO LTD
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  • Apparatus and method for increasing contrast ratio using histogram match
  • Apparatus and method for increasing contrast ratio using histogram match
  • Apparatus and method for increasing contrast ratio using histogram match

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Embodiment Construction

[0059] Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like parts throughout. For the purpose of illustrating the present invention, the present invention will be described with reference to the accompanying drawings.

[0060] Example.

[0061] figure 2 is a block diagram of a contrast enhancement apparatus 200 according to an aspect of the present invention.

[0062] 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 specifying part 240 .

[0063] The first operation section 210 calculates the average value and standard deviation of the input image. The second operation section 220 calculates the average value and standard deviation of the target image from the average value and standard deviation of the input image....

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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 from Korean Patent Application No. 2002-6832 filed with 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 using histogram matching, in particular to a device and method for enhancing the contrast of an output image 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 pixel contrast values ​​in an image. In other words, the histogram describes the distribution and value of the bright and dark spots present in the image. The smoothing of the histogram can make the distribution of contrast values ​​of a biased or non-uniform image uniform, thus enhancing the image. By smoothing the histogram, dark images are brightened and too bright images are slightly...

Claims

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Application Information

Patent Timeline
05 Jul 2006
Publication
CN1263278C
IPC
H04N1/407; G06T5/40; G06T5/00; G06K9/00; G09G3/20; H04N5/20
CPC
G06T2207/20216; G06T5/50; G06T5/40; G06T5/009; G06T5/92
Inventors
吴才焕; 梁承埈