Self-adapting contrast and brightness reinforcement with colour save

A contrast and brightness technology, applied in brightness and chrominance signal processing circuits, color TV components, color TV, etc., can solve problems such as saturation

Inactive Publication Date: 2004-02-25
SAMSUNG ELECTRONICS CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it has the disadvantage that it makes it impossible to adjust the gain based only on the color of the image, making selective extension depending on the brightness level of the video image impossible, and, moreover, saturation due to the extension of the dynamic range

Method used

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  • Self-adapting contrast and brightness reinforcement with colour save
  • Self-adapting contrast and brightness reinforcement with colour save
  • Self-adapting contrast and brightness reinforcement with colour save

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Embodiment Construction

[0023] Embodiments of the present invention will now be described with reference to the accompanying drawings showing preferred embodiments of the invention. The same reference numbers in different drawings represent the same elements.

[0024] refer to figure 1 , according to the contrast ratio of the first embodiment of the present invention and the brightness enhancement device 100 comprises: a first image conversion circuit 10, a maximum value output circuit 20, a first brightness level conversion circuit 30, a second image conversion circuit 40 , a second brightness level conversion circuit 50, and a level smoothing circuit 60.

[0025] The first image conversion circuit 10 receives an input RGB video signal (RGB), converts the RGB signal into a YCbCr color space, and outputs digital luminance Y and tone information to the first luminance level conversion circuit 30 . This hue information includes two color difference components Cb and Cr. Cb represents the difference ...

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Abstract

A method and apparatus for selectively enhancing contrast depending on the level of incoming video signals while preserving colors are provided. An apparatus for enhancing the contrast and brightness of a video signal displayed on a display device includes: a first luminance level transformation circuit that receives luminance and chrominance signals, reduces the level of the luminance signal in response to a first control signal, and outputs the chrominance signals and the luminance signal whose level has been reduced; an image converting circuit that receives the output signals from the first luminance level transformation circuit and converts the received signals into RGB video signals; and a second luminance level transformation circuit that receives the RGB video signals from the image converting circuit, concurrently increases the respective levels of the RGB video signals in response to a second control signal, and outputs the RGB video signals whose levels have been increased. It is desirable that the display device is a color display tube ('CDT'), a thin film transistor liquid crystal display ('TFT-LCD'), or a plasma display panel ('PDP').

Description

technical field [0001] The invention relates to video image signal processing, in particular to an adaptive contrast and brightness enhancement method and device for preserving the color of an image displayed on a display device. Background technique [0002] In video image signal processing, in environments where the dynamic range of video images output to a display device is limited, it is known to control or shift the level of input video images by a linear function to enhance the contrast of these video images. In this case, the non-linear function is fixed in advance or variable according to the histogram of the input video image. [0003] In the case of directly transforming the input video image level by a non-linear function, an undesired white component will be produced and the saturation will be degraded. The contrast at a certain level of a video image within a limited range can be increased, but in order to increase the contrast while maintaining the hue, a meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00G09G3/20H04N1/407H04N1/46H04N1/60H04N5/57H04N9/68H04N9/77
CPCH04N5/57H04N9/68H04N21/4318H04N21/44008H04N9/77
Inventor 韩镕仁金昌容李性德许彰元朴硕俊
Owner SAMSUNG ELECTRONICS CO LTD
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