FM halftoning via block error diffusion
نویسندگان
چکیده
Error di usion halftoning is a popular method of producing frequency modulated (FM) halftones. In FM halftoning the dot size and shape is xed (equal to one pixel) and the dot frequency is varied in accordance to the graylevel values of the underlying grayscale image. We generalize error di usion to produce FM halftones with user controlled dot size and shape using block quantization and a block lter in the feedback loop. We call this modi ed quantization and feedback process block error di usion. The block lters are designed from well known scalar error lter prototypes and retain their properties. Further, we show that choosing a structured block lter results in an e cient parallel implementation of block error di usion.
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