Comparison of Some Classical Similarity Measures
几种经典相似性度量的比较研究*

In view of the image registration probability and registration precision,some classical similarity measures are compared theoretically.The conclusions drawn from this paper are: Absolute Difference(AD) and Mean Absolute Difference(MAD) are equivalent.Square Difference(SD),Mean Square Difference(MSD),Product correlation similarity measure(Prod) and the Normalized product correlation similarity measure(Nprod) are equivalent.Prod/Nprod/SD/MSD is better than AD/MAD when Signal-Noise-Ratio(SNR) is low,otherwise AD/MAD is better than Prod/Nprod/SD/MSD.The comparison of the classical similarity measures may be used as a reference for the choice of similarity measures when some practical image registration or scene matching problems are encountered.