Patent ID: 7787703
Filing Date: 2010-08-31
Classification: G06T,H04N

Abstract:
1. A method for converting a first pixel of image data to a first pixel of contone image data, comprising: (a) determining, using an electronic circuit, a tagged state value for each pixel of a plurality of pixels of image data; (b) reconstructing, using an electronic circuit, the first pixel of image data to create reconstructed contone image data; (c) summing, using an electronic circuit, a plurality of tagged state value dependent weighted pixel values to create summed contone image data, each tagged state value dependent weighted pixel value corresponding to a pixel of image data within a predefined neighborhood of pixels of image data, the predefined neighborhood of pixels of image data having the first pixel of image data therein, a tagged state value dependent weighted pixel value being zero when the tagged state value of the corresponding pixel of image data indicates that the corresponding pixel of image data is an edge pixel and a tagged state value dependent weighted pixel value being equal to a product of a coefficient, a window coefficient, and a corresponding pixel value when the tagged state value of the corresponding pixel of image data indicates that the corresponding pixel of image data is a non-edge pixel, the window coefficient being equal to 1/n wherein n is a number pixels of image data within the predefined neighborhood of pixels having a tagged state value indicating that the pixel of image data is a non-edge pixel; (d) selecting, using an electronic circuit, when the tagged state value of the first pixel of image data indicates the first pixel of image data is a non-edge pixel, the summed contone image data as an image data value for the first pixel of contone image data; and (e) selecting, using an electronic circuit, when the tagged state value of the first pixel of image data indicates the first pixel of image data is an edge pixel, the reconstructed contone image data as the image data value for the first pixel of contone image data.