GRAY-SCALE IMAGE-CODING FOR FREEZE-FRAME VIDE-OCONFERENCING

被引：11

作者：

ANASTASSIOU, D ^{[1
]}

PENNEBAKER, WB ^{[1
]}

MITCHELL, JL ^{[1
]}

机构：

[1] IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598

来源：

IEEE TRANSACTIONS ON COMMUNICATIONS | 1986年 / 34卷 / 04期

关键词：

DIGITAL COMMUNICATION SYSTEMS - IMAGE PROCESSING - INFORMATION THEORY - Data Compression;

D O I：

10.1109/TCOM.1986.1096538

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

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 multiplied by 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 kb/s dial-up telephone lines in about a half minute. The gray-scale image processing and compression algorithms are described.

引用

页码：382 / 394

页数：13

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