Image error resilient and video error concealment codes for wavelet compression and noisy channel communication

Video compression strategy consists of a tacit tradeoff of the spatial redu ndancy, whose spatial singularities are captured efficiently in terms of ze ro-phase symmetric wavelet transform (WT) subband coefficients, with their temporal redundancy. On the other hand, the redundancy is robust under nois y channel, and furthermore, an over reduction spatially may hurt the tempor al correspondence principle yielding a large frame rate reduction. The vide o error resilient codes are built upon the single frame error resilient cod es, which must have known positions partitioned carefully in order to prote ct against wireless channel errors during transmission of the discrete WT c oefficients. These coefficients have been compressed based on the tradition al compression scheme using scalar quantization, runlength, and Huffman cod ing. The discrete WT biorthogonal (7, 9) wavelet is used. The code is illus trated with relatively good performance for (480x480x8 bits) forward-lookin g infrared images, compressed at up to 0.09 bits per pixel, and bit error r ates at about 10(-3). Furthermore, in this paper we adopt the single frame error resilient coding and extend to video multiple frames with the help of frame error concealment techniques. An attempt is made to perform decompre ssion error concealment, which is an interpolation from neighborhood in spa ce and time. (C) 1998 SPIE and IS&T. [S1017-9909(98)01204-5].