Patent Document ID: 8797601
Application ID: 13427317
Patent Status: 1

Claim One:
1. A system for maintaining edge pixels in a reduced coverage image, comprising: a halftoning circuit to convert pixels of continuous image data to pixels of binary image data using a halftone screen corresponding to a predetermined reduced coverage percentage, the halftone screen having a predetermined number of thresholds, the halftone screen having a first number of thresholds set to a first value, the first number being a first percentage of the predetermined number, the first percentage being equal to 100% minus the predetermined reduced coverage percentage, the halftone screen having a second number of linearly scaled thresholds, the second number being a second percentage of the predetermined number, the second percentage being equal to the predetermined reduced coverage percentage; and an edge detection circuit to determine a non-edge pixel in the binary image data; said edge detection circuit determining if a target pixel of binary image data in a window of pixels of binary image data is a non-white pixel; said edge detection circuit comparing, when said edge detection circuit determines that the target pixel of binary image data in a window of pixels of binary image data is a non-white pixel, the window of pixels of binary image data with a predetermined pattern of pixels of binary image data corresponding to the predetermined reduced coverage percentage, said predetermined pattern of pixels of binary image data not including pixels of binary image data converted from the pixels of continuous image data; said edge detection circuit determining that the target pixel is a non-edge pixel when said edge detection circuit determines that every non-white pixel location in the predetermined pattern of pixels of binary image data corresponds to a non-white pixel location in the window of pixels of binary image data.