Resolution enhancement system for binary images

Details Resolution enhancement system for binary images Resolution enhancement system for binary images

1992-11-30

1996-03-26

Bayerl, Raymond J.

395115, 395128, G06K 1500, H04N 140

Patent

active

055027938

ABSTRACT:
An image processing system for providing edge enhancement of low resolution binary image files processes the low resolution bitmap data in sections or windows to determine whether an edge transition or "kink site" occurs within each window. The original bitmap data in the window is then replaced with edge enhanced gray scale data if a kink site is identified. The selection of the correct edge enhanced gray scale data to be used in place of the original bitmap data is based on whether the central pixel contained within the window is a black or white pixel, whether the central pixel is located on a single pixel line, and the location of the central pixel with respect to the kink site. The determination of whether the central pixel is a black or white pixel is based on the binary value assigned to the pixel, the determination of the location of the central pixel with respect to the kink site is based on pixel values and gradient magnitudes of surrounding pixel locations, and the determination of whether the central pixel is located on a single pixel line is based on the gradient magnitude of the central pixel and surrounding pixel locations.

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IBM Technical Disclos. Bulletin: vol. 28, No. 12, May 1986 pp. 5634-5637 `Fast One Pixel Edge Detctor` (see whole document).
MacUser, "Image Makers", Henry Bortman, Nov. 1991, pp. 98, 102, 103.

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