METHOD AND APPARATUS CAPABLE OF PRODUCING FM LATTICE POINTS IN HIGH SPEED

摘要

The invention discloses a method and apparatus capable of producing frequency-modulation lattice points in high speed, belonging to digital image halftone field. In the exist art, an error line is usually carried out read-write operation many times when a pixel is processed, thus the lattice point generates slowly. In the method according to the invention, the errors generated by current pixels are buffered in a register stack, and the final error accumulation value is written in the error line only after all correlated pixels are processed, therefore, each processed pixel only needs one time of read-write operation to the error line. This invention also provides an apparatus implementing the method, the apparatus is composed of seven parts: an error line storage, an error buffer register stack, a gray generation circuit, a threshold value comparing circuit, an error generation circuit, an error buffer register stack control circuit and an error line control circuit. By adopting the method and apparatus of this invention, operation steps are reduced and producing speed of FM lattice point is greatly improved.