
96 Image and Video Compression
structural similarity index (MESSIM) is used. The value ranges from 0 to 1. If
close to 1, then all major edges in the decompressed image have been pre-
served. This was presented by Gaun Hao Chen et al. (2006) and uses the Sobel
Operator. We have used the Canny edge operator and modied it for better
performance. This edge quality measure is derived from the concept of the
mean structural similarity index measure (MSSIM) developed by Z.Wang,
A.Bovik et al. (2004), which takes the human visual system (HVS) into account
for the determination of quality of decompressed images. This measure was
developed because t ...