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Device and method used for adaptive brightness control

A brightness control and self-adaptive technology, applied in color TV parts, TV system parts, image data processing and other directions, can solve the problem of sudden bright or dark images

Inactive Publication Date: 2007-04-04
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, if the input image signal has little or no change as a whole but has bright or dark parts thereon, a phenomenon occurs as follows: When the input image signal is controlled by the brightness control unit 20 and displayed on the screen, the image become unnecessarily bright or dark

Method used

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  • Device and method used for adaptive brightness control
  • Device and method used for adaptive brightness control
  • Device and method used for adaptive brightness control

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Embodiment Construction

[0037] Various aspects of the invention will now be described in detail, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout. Various aspects are described below in order to explain the present invention by referring to the figures.

[0038] FIG. 3 is a block diagram showing a brightness control device according to an aspect of the present invention.

[0039] The brightness control device shown in Fig. 3 comprises: probability density function (PDF) calculation unit 100, compensation value calculation unit 200, brightness control (or threshold upper bit (BUBO) unit 300, cumulative distribution function (CDF) generation unit 400 , a CDF compensation unit 410 and a mapping unit 500 .

[0040] The PDF calculation unit 100 detects a pixel value of each pixel forming an input image signal, and calculates a probability density function (PDF) from the detected result. The pixel value may be a brightness v...

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Abstract

Disclosed is a brightness control apparatus and method capable of adaptively compensating brightness values based on an average brightness of an image signal. The adaptive brightness control apparatus comprises a probability density function (PDF) calculation unit calculating a PDF based on a distribution of pixel values of pixels of an input image signal, a compensation value calculation unit for calculating an average value of the pixel values of the respective pixels, and calculating a function having a predetermined slope according to a range of the average brightness value, and a pixel value compensation unit for re-establishing the distribution of the pixel values based on the calculated function. The brightness control apparatus adaptively corresponds to the brightness of an input image signal preventing flickering, and does not require an additional hardware structure, when additionally requiring a function for compensating brightness values, by implementing the required function through conversion of embedded function values.

Description

technical field [0001] The present invention relates to a brightness control device and method, in particular to a brightness control device and method capable of adaptively controlling brightness according to the average brightness of an image signal with little or no increase in hardware. Background technique [0002] In general, when video image signals are processed, imbalance or distortion in brightness of the image signals frequently occurs mainly due to varying factors such as lighting, shooting conditions, and characteristics of video displays. In fact, in many cases, even the brightness of the same image signal varies according to the type of video display on which the image signal is reproduced. For example, when the same image signal is input and reproduced through different video displays, the image signal has different brightness in low-brightness and high-brightness regions according to the characteristics of the video display displaying the image signal. To c...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/57H04N5/14G06T5/40H04N1/407
CPCH04N5/57H04N1/4074H04N21/44008G06T5/009G06T5/40H04N21/4318G06T5/92
Inventor 梁承埈姜贤吴才焕朴永濬
Owner SAMSUNG ELECTRONICS CO LTD