对比度、亮度、色调和 yuv分量的关系

最新推荐文章于 2023-06-04 13:06:56 发布

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最新推荐文章于 2023-06-04 13:06:56 发布

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分类专栏：笔记文章标签：图像处理

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本文探讨了YCbCr色彩空间中的对比度、亮度、饱和度和色调控制原理，包括调整范围和实施方法，帮助理解图像处理中这些关键参数的重要性。

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The contrast control is implemented by multiplying the YCbCr data by a constant. If Cb and Cr are not adjusted, a color shift will result whenever the contrast is changed. A typical 8-bit contrast adjustment range is 0~1.992x.

The brightness control is implemented by adding or subtracting from the Y data. Brightness is done after the contrast to avoid introducing a vary DC offset due to adjusting the contrast. A typical 8-bit brightness adjusting range is -128 to + 127.

The hue control is implemented by mixing the Cb and Cr data:
Cb’=Cbcosθ+Crsinθ
Cr’=Crcosθ-Cbsinθ
Where θ is the desired hue angle. A typical 8-bit hue adjustment range is -30° to +30°.
The saturation control is implemented by multiplying both Cb and Cr by a constant. A typical 8-bit saturation adjustment range is 0~1.992x.