Patent ID: 8564840

Claim:
A halftoning method for annular rasters comprising: using annular rasters with uniformly spaced raster lines and uniformly spaced pixels within said raster lines; angularly tiling wedge shaped halftone cells around at least a partial circumferential print medium wherein an integer number of wedge tiles fills a disc space; wherein said annular rasters are considered in arcs and wherein pixel thresholds in said wedge shaped halftone cells are considered in arcs so as to conform to said annular rasters upon tiling said wedge shaped halftone cells; setting the number of pixel thresholds in each arc raster of said cell to an integer value near a desired writing resolution to enable seamless tiling wherein said number of thresholds increase as a function of a wedge cell radius; and printing, using a printer, said annular rasters on an at least partial circumferential printing medium.