Pixel correction and smoothing method

Image analysis – Image enhancement or restoration – Edge or contour enhancement

Patent

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Details

382299, 358462, 358455, G06T 500

Patent

active

055374956

ABSTRACT:
An improved method for providing a more faithful and pleasing rendition of a pixel pattern is described herein. This method first places the original pixel pattern in a bit mapped memory. A small portion of this bit mapped pattern, called an input tile, acts as an index for a look-up table containing a corrected pixel pattern portion (an output tile) corresponding to the target pixels to be corrected in the input tile. This process may also be performed using an algorithm. To derive the output tiles, a high resolution bit map is created from an input tile. A triangular portion of each convex corner in the high resolution bit map is chopped off, and a triangular portion of each concave corner in the high resolution bit map is filled in. The resulting high resolution bit map is then filtered using a low pass filter. The size of these triangular portions and the extent of filtering are determined using a function based on the vulnerability of pixels to being eliminated during the above smoothing process. The middle portion of the high resolution bit map corresponding to the two original target pixels intended to be corrected is then divided up into a number of pixel areas, where each area represents a pixel to be printed. A threshold number is then compared to the pixels in each area, and a corresponding output pixel is then stored, printed, or otherwise displayed.

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