Color space converting circuit and method thereof

A technology of color space conversion and color space, which is applied in the direction of color signal processing circuit, etc., can solve the problems of xvYcc color space that cannot express wide color gamut, 8-bit representation, and cannot improve visual effects, etc.

Inactive Publication Date: 2010-10-27
MSTAR SOFTWARE R&D (SHENZHEN) LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the part beyond 0 to 255, that is, the part of -17.46 to 0 and 255 to 277, cannot be represented by 8 bits
The conventional art department discards the part from -17.46 to 0 as 0, and discards the part from 255 to 277 as 255, so that the wide color gamut of the xvYcc color space cannot be fully expressed in the sRGB color space and cannot be improved. Visual effects

Method used

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  • Color space converting circuit and method thereof
  • Color space converting circuit and method thereof
  • Color space converting circuit and method thereof

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Embodiment Construction

[0014] figure 2 It is a block diagram of an embodiment of the color space conversion circuit 20 of the present invention, including a buffer unit 24 and a conversion unit 23 . The color space conversion circuit 20 can perform conversion from the xvYcc color space (hereinafter referred to as xvYcc) to the sRGB color space (hereinafter referred to as sRGB). sRGB has three color space dimensions, namely red, green, and blue dimensions. sRGB has a coverage range in each dimension, and the coverage range has a lower limit value and an upper limit value (hereinafter respectively referred to as the first lower limit value and the first upper limit value), if represented by 8 bits, they are 0 with 255. When converting xvYcc to sRGB, xvYcc also has a lower limit and an upper limit in the red, green and blue dimensions (referred to below as the second lower limit and the second upper limit respectively), if 8 Bit representation, respectively -17.46 and 277. Therefore, the second lo...

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Abstract

The invention relates to a color space converting circuit and a method thereof. In the invention, when an xvYcc color space is transformed into a sRGB color space, by adopting a simplified circuit design, the part beyond the sRGB color space is compressed into the sRGB color space so as to promote the visual effect. The color space converting circuit comprises a converting unit, and the converting unit can transform a pixel signal from the xvYcc color space into the sRGB color space. During the transformation process, the converting unit generates the pixel component of the pixel signal on the color space dimensionalities of the sRGB color space; when any one pixel component is positioned in a compression region, the converting unit compresses the pixel component so as to output a compressed pixel component; and the compressed pixel component does not exceed over the coverage scope of the sRGB color space on the corresponding color space dimensionality.

Description

technical field [0001] The present invention relates to color space conversion, especially to a color space conversion circuit and method. Background technique [0002] YCbCr and sRGB (standard RGB) are commonly used standard color spaces. In practical applications, for example, imaging devices (such as digital cameras or DVD players, etc.) can output video signals in YCbCr format to display devices (such as digital TVs, etc.) ), the display device converts it to sRGB format for display. In the CCIR Recommendation 601 specification, each of Y (brightness), Cb and Cr (chroma) is coded with 8 bits, wherein the range of Y is 16-235, and the range of Cb and Cr is 16-240. When converting the YCbCr color space to the sRGB color space, use the following conversion formula: [0003] R ′ G ′ ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N9/64
Inventor 蔡孟哲
Owner MSTAR SOFTWARE R&D (SHENZHEN) LTD
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