SAD(Sum of Absolute Difference)、SAE(Sum of Absolute Error)即絕對誤差和
SATD(Sum of Absolute Transformed Difference)即hadamard變換後再絕對值求和
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)即平均絕對差值
MSD(Mean Squared Difference)、MSE(Mean Squared Error)即平均平方誤差