Title :
Analysis of space-dependent characteristics of motion-compensated frame differences based on a statistical motion distribution model
Author :
Zheng, Wentao ; Shishikui, Yoshiaki ; Naemura, Masahide ; Kanatsugu, Yasuaki ; Itoh, Susumu
Author_Institution :
Panasonic Beijing Lab., China
fDate :
4/1/2002 12:00:00 AM
Abstract :
Although it has been observed that motion-compensated frame differences increase toward block boundaries and overlapped block motion compensation (OBMC) has been shown to provide reduced blocking artifacts as well as improved prediction accuracy, there is almost no satisfactory theoretical basis that clearly interprets the space-dependent characteristics of motion-compensated frame differences, nor have the theoretical aspects of OBMC been investigated thoroughly. We first interpret the space-dependent characteristics of motion-compensated frame differences based on a novel statistical motion distribution model. We then apply the statistical motion distribution model to the analysis of prediction efficiency of OBMC. Through the analysis, we prove theoretically that OBMC can reduce and equalize the motion-compensated frame differences across a block. The analytical results are justified by empirical experiments with typical image sequences
Keywords :
image sequences; motion compensation; prediction theory; statistical analysis; block boundaries; blocking artifacts reduction; image sequences; motion-compensated frame differences; overlapped block motion compensation; prediction accuracy; prediction efficiency; space-dependent characteristics; statistical motion distribution model; Accuracy; Design optimization; Discrete cosine transforms; Image motion analysis; Image sequences; Laboratories; Motion analysis; Motion compensation; Motion estimation; Predictive models;
Journal_Title :
Image Processing, IEEE Transactions on
DOI :
10.1109/TIP.2002.999672