Slice groups for post-compression region of interest encryption in SVC

Abstract

In this paper, we assess the adequacy of slice groups for the reduction of drift which occurs in bit-stream-based region of interest encryption in SVC. For practical surveillance camera applications, we introduce the concept of all-grey base layers which simplify the encryption of regions of interest while obeying all standard-imposed base layer restrictions. Furthermore, we show that the use of slice groups is possible with relatively low overhead for most practical configurations with two or three spatial layers. In addition, we analyze the effect of spatial resolution on overhead, showing that an increase in resolution decreases the relative overhead.