Discuss digital image processing, necessary of video compressing and principle of video compressing.

论述了数字图像处理的方法，以及视频压缩的必要性，压缩原理等。

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First of all, we discuss the model definition, characteristic and suitable range of several color models from optics, visual psychology and digital image processing.

首先，从光学、视觉心理学、数字图像处理等多种角度对各种颜色模型进行了讨论，分析它们的模型定义、特点以及适用范围。

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First of all, we discuss the model definition, characteristic and suitable range of several color models from optics, visual psychology and digital image processing.

首先，从光学、视觉心理学、数字图像处理等多种角度对各种颜色模型进行了讨论，分析它们的模型定义、特点以及适用范围。

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