公开(公告)号：CA1209244A

公开(公告)日：1986-08-05

申请号：CA441822

申请日：1983-11-24

Applicant: IBM

Inventor： FEDAK JOHN F ,  FINDLEY GERALD I ,  TORR TERRY A

IPC: H04N1/41 ,  G06K15/00 ,  G09G5/42 ,  H04N1/415 ,  H04N7/12

Abstract: Image or character data in the form of a rectangular array of binary 1s and 0s (bits) are divided into a plurality of segments, such as thirty-two by thirty-two bit segments or one bit by eight bit or byte segments. The image data is scanned for identifying all-zero segments (background) which are ignored and non-zero segments (foreground) which are transmitted or stored with offset and length (number of successive non-zero segments). The compacted image data is suitably indexed for facilitating image expansion using simple techniques. All compaction and decompaction machine operations are independent of bit-significant informational content of the segments. Presentation of the uncompacted data uses any printer or display type of device.