Evolving JPEG color data compression standard
Joan L. Mitchell, William B. Pennebaker
SPIE Standards for Electronic Imaging Systems 1991
A new gray-scale image coding technique has been developed, in which an extended DPCM approach has been combined with entropy coding. This technique has been implemented in a freeze-frame videoconferencing system which is now operational at IBM sites throughout the world. Following image preprocessing, the two fields of the interlaced 512 × 480 pixel video frame are compressed sequentially with different algorithms. The reconstructed image quality is improved by subsequent image postprocessing, the final reconstructed image being almost indistinguishable from the original image. Typical gray-scale video images compress to about a half bit per pixel and transmit over 4.8 kbit/s dial-up telephone lines in about a half minute. The gray-scale image processing and compression algorithms are described in this paper. Copyright © 1986 by The Instilute of Electrical and Electronics Engineers, Inc.
Joan L. Mitchell, William B. Pennebaker
SPIE Standards for Electronic Imaging Systems 1991
Joan L. Mitchell, Gehard Thompson, et al.
CIC 2001
John D. McFall, Joan L. Mitchell, et al.
Proceedings of SPIE 1989
Joan L. Mitchell, William B. Pennebaker, et al.
IEEE Transactions on Communications