By the definition of chroma in television principle, the mathematic model of signal based on basic chroma coding is established. The method concerning luminance, hue and saturation is also presented.
依据电视学色度图的定义，建立了基色编码条件下的信号数学模型，给出了一个与亮度、色调和饱和度相关的数字视频测试信号的设计方法。
Then, exposure parameters of the space camera can be calculated by setting the highest luminance information measured before as the saturation luminance of the space camera.
再将该高亮度设为空间相机的饱和亮度，解算空间相机的曝光参量；
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