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Gamma correction apparatus and method capable of preventing noise boost-up

A technology of gamma correction and equipment, applied to the parts of color TV, parts of TV system, TV, etc., can solve the problems of noise enhancement and signal-to-noise ratio reduction

Inactive Publication Date: 2005-11-23
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the conventional gamma correction enhances the luminance level of the image together with the noise luminance level, which causes a noise enhancement phenomenon, so there is a problem that the signal-to-noise ratio is lowered in the low luminance level range of the image displayed on the CRT

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  • Gamma correction apparatus and method capable of preventing noise boost-up
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Embodiment Construction

[0042] Embodiments of the present general inventive concept will now be described in detail, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like parts throughout. Hereinafter, the embodiments are described in order to explain the present general inventive concept by referring to the figures.

[0043] figure 2 is a block diagram illustrating a gamma correction device capable of preventing noise enhancement according to an embodiment of the present general inventive concept.

[0044] exist figure 2 Among them, the gamma correction device 200 capable of preventing noise enhancement according to an embodiment of the present general inventive concept is a device that prevents a noise enhancement phenomenon when gamma is corrected.

[0045] according to figure 2 The gamma correction device 200 capable of preventing noise enhancement in the embodiment includes: a signal extraction unit 210, a temporary weight calculation...

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Abstract

A gamma correction apparatus and method capable of preventing noise boost-up. A signal extraction unit extracts high-frequency signals and low-frequency signals from an input image signal, a temporary weight value calculation unit calculates a predetermined temporary weight value based on the luminance level of the input image signal, a decision unit determines the high-frequency signals of the extracted high-frequency signals involved in a gamma correction based on the calculated temporary weight value, and a gamma correction unit applies the gamma correction to the extracted high-frequency signals and low-frequency signals involved in the gamma correction, so that the present invention can prevent a noise boost-up phenomenon occurring upon the gamma correction.

Description

technical field [0001] The present general inventive concept relates to a gamma correction apparatus and method capable of preventing noise enhancement. More particularly, the present general inventive concept relates to a gamma correction apparatus and method capable of processing noise to prevent a noise enhancement phenomenon from occurring when the gamma is corrected. Background technique [0002] In an image capture device such as a camcorder, the brightness level of the output image has figure 1 The linear characteristic shown by the line ① in the cathode ray tube (CRT), however, the brightness level of the output image in the cathode ray tube (CRT) has the following with respect to the input voltage figure 1 The nonlinear characteristics shown by the line ② in the This non-linear characteristic causes image distortion on the CRT. [0003] Therefore, to correct or compensate for this image distortion, gamma correction is applied to figure 1...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/21H04N5/202H04N5/205
CPCH04N5/202H04N5/205H04N23/82H04N5/21
Inventor 金文喆李相珍
Owner SAMSUNG ELECTRONICS CO LTD