Digital half-tone grey scale expansion system

Details Digital half-tone grey scale expansion system Digital half-tone grey scale expansion system

G - Physics

03

G

314/43, 314/7

G03G 15/04 (2006.01) H04N 1/405 (2006.01)

Patent

CA 1091750

ABSTRACT OF THE DISCLOSURE Method and apparatus for expanding the number of grey scale values in a digital flying-spot scanning system. The scanned recording medium is divided into a plurality of unit cells, each of which is assigned a desired grey scale value, and each unit cell is further divided into a plurality of subcells formed by a plurality of adjacent portions of scan lines comprising digitally controlled segments. The grey scale value of the unit cell is dependent upon the por- tion of the subcells within the unit cell which are activated or deactivated by the scanning beam. Additionally, the number of grey scale values between particular numbers of activated subcells is expanded by providing varying patterns of pre- determined numbers of subcells within the unit cell with the varying patterns producing the optical effect of varying grey scale levels.

270130

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