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A accomplished remedy of assorted ways to monochrome and electronic halftoning. It describes excellent spatial and spectral features of eco-friendly- and blue-noise halftoning that supply styles of appearance and computational complexity in quite a lot of printing applied sciences. The ebook comes with a CD-ROM of algorithms and data with color examples.
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A accomplished remedy of varied ways to monochrome and electronic halftoning. It describes excellent spatial and spectral features of eco-friendly- and blue-noise halftoning that offer styles of appearance and computational complexity in a variety of printing applied sciences. The ebook comes with a CD-ROM of algorithms and information with color examples.
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Additional info for Modern Digital Halftoning (Signal Processing and Communications)
25: A comparison of Floyd's and Steinberg's original error diffusion algorithm with Ulichney's threshold modulated error diffusion algorithm. location of other dots. So a real challenge has come to face researchers as they try to improve the image quality in these types of printers. What they are finding is that halftoning algorithms that cluster same color pixels together, in a random fashion, hold the key by creating patterns that are easier to produce consistently from page to page and by creating color halftone patterns without moiré.
As the grating continues to get farther away from the eye, it reaches a point where sensitivity decreases at higher frequencies and the grating begins to look more and more like a flat shade of gray. If, instead, the grating gets closer to the eye, it will also reach a point where the grating is changing so slowly per visual degree that it also begins to look like a flat shade of gray. This corresponds to the sharp drop in sensitivity near the DC (fρ = 0) frequency, but when modeling the HVS, this drop in sensitivity near DC is usually ignored with the CSF modeled by CSF' (fρ) where: The human visual system is not, in general, isotropic, and therefore, the orientation of the grating does play a significant role in the sensitivity of the eye to its sinusoidal frequency .
3. 22: Brief outline of the history of halftoning and the digital printing industry. binary search (DBS) algorithm. This algorithm iteratively swaps and toggles the binary halftone pattern according to the error between the original continuous-tone image and the binary halftone image as defined by a model of the human visual system. Typically, the human visual system is modeled as a low-pass filter, and by employing it into the halftoning algorithm, causes same colored dots to be spread as far apart as possible, creating a power spectrum that models blue-noise.