H - Electricity – 04 – N
Patent
H - Electricity
04
N
178/3.1
H04N 1/40 (2006.01) H04N 1/405 (2006.01)
Patent
CA 1159373
-1- ABSTRACT OF THE DISCLOSURE An electrical screening system for binary displays or binary graphic recording systems is dis- closed which suppresses false contours. The suppression is achieved by increasing the number of gray levels that a given m x n matrix of pixels can represent. Each pixel can only represent one of two gray levels in a binary display or graphic system. A conventional m x n halftone cell is able to reproduce m x n + 1 gray levels. The extra gray levels above the m x n + 1 quantity are achieved for a given m x n halftone cell by dynamically changing the values of the m x n screen signals associated with a halftone cell. The amount of the change is limited to a value between zero and D inclusive where D is the difference between two adjacent screen signal values.
361707
Gowling Lafleur Henderson Llp
Xerox Corporation
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