Method for frequency-modulation screening using error diffusion based on dual-feedback

摘要

Relates to a method for creating a halftone dot in the field of hard copy of the image, The invention relates to a method for frequency-modulation screening using error diffusion based on dual-feedback, especially. In amplitude modulation screening techniques and frequency modulation known, may output a halftone image of high quality using an output device low resolution with (600dpi) is difficult, and shows in detail the gray level of the original image, the original image sufficient effect to hold the smoothness of the can not be achieved. Dual feedback technique based on the basic algorithm of the error diffusion and to achieve an organic combination of the amplitude-modulation screening and frequency-modulation screening the conventional method of the invention achieves the effect of a screen that is mixed. Can to output a halftone image of the entire gradation and high quality, and effectively solves the problem of losing gradations of dots in an output equipment with low resolution, the method of the present invention, by the random distribution characteristic It is possible to reduce the moire caused.