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几种代价函数

SAD(Sum of Absolute Difference)=SAE(Sum of Absolute Error)即绝对误差和
SATD(Sum of Absolute Transformed Difference)即hadamard变换后再绝对值求和
SSD(Sum of Squared Difference)=SSE(Sum of Squared Error)即差值的平方和
MAD(Mean Absolute Difference)=MAE(Mean Absolute Error)即平均绝对差值
MSD(Mean Squared Difference)=MSE(Mean Squared Error)即平均平方误差