A text image data compression system for compressing image data having pixels each being expressed by N bit data which varies from a maximum value to a minimum value, includes a circuit for replacing the maximum value N bit data with a first symbol "3" followed by N-1 bit common data "*" and the minimum...http://www.google.ca/patents/US5056154?utm_source=gb-gplus-sharePatent US5056154 - Text image data compression system
