为可空类型提供类库支持，包括转换运算符和算术运算符。
Library Support for nullable types, including conversion operators and arithmetic operators.
颜色分类处理使用特征函数，可以减少颜色坐标转换运算，提高颜色分类速度。
Characteristic function is used for color classification, which can reduce the operation of color coordinate conversion and improve the speed of color classification.
而根据此离散馀弦转换区块形式则在后续的反向离散馀弦转换运算中运用较少个数之离散馀弦转换系数来做计算。
A reduced number of DCT coefficients is computed in a subsequent inverse DCT computation based on the DCT block type.
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