Title :
A new approach to reduce the `blocking effect´ of transform coding [image coding]
Author :
Zhang, Ya-Qin ; Pickholtz, Raymond L. ; Loew, Murray H.
Author_Institution :
Contel Technol. Center, Chantilly, VA, USA
fDate :
2/1/1993 12:00:00 AM
Abstract :
A combined-transform coding (CTC) scheme to reduce the blocking effect of conventional block transform coding and hence to improve the subjective performance is presented. The scheme is described, and its information-theoretic properties are discussed. Computer simulation results for a chest X-ray image are presented. The CTC scheme, the JPEG baseline scheme, and the conventional discrete Walsh-Hadamard transform (DWHT) are compared to demonstrate the performance improvement for the CTC scheme. The advantages of the CTC scheme include no ringing effect as there is no error propagation across the boundary, no additional computation, and distortion always held within a certain level
Keywords :
data compression; image coding; transforms; CTC scheme; JPEG baseline scheme; blocking effect reduction; chest X-ray image; combined-transform coding; discrete Walsh-Hadamard transform; image coding; image compression; information-theoretic properties; subjective performance; Bit rate; Communications Society; Computer science; Digital communication; Image coding; Information filtering; Information filters; Laboratories; Systems engineering and theory; Transform coding;
Journal_Title :
Communications, IEEE Transactions on
