Method and apparatus for enhancing and thresholding images

Details Method and apparatus for enhancing and thresholding images Method and apparatus for enhancing and thresholding images

1998-05-19

2000-06-06

Mehta, Bhavesh

Image analysis

Image compression or coding

Gray level to binary coding

382263, 382272, 382274, 382300, 358428, 358465, G06K 936, G06K 932, G06K 940

Patent

active

060729074

ABSTRACT:
An image processing method and system for generating enhanced binary image data from greyscale input image data. The method includes the steps of (a) receiving first image data, the first image data being greyscale image data defining an input image, (b) performing a high frequency boost operation on the first image data to produce second image data, (c) performing a linear interpolation operation on the second image data to produce third image data, the third image data having a resolution higher than the resolution of the second image data, (d) performing a contrast enhancement operation on the third image data to produce fourth image data, and (e) thresholding the fourth image data to produce fifth image data, the fifth image data being binary image data defining an output image. The techniques find application, for example, in over-the-desk scanning of documents, and in video-conferencing.

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European Search Report EP 0 881 596 A3 for EPO counterpart Application No. 98304195.5 published Jan. 13, 1999.
Mitchell, Joan L, William B. Pennebaker, Dimitris Anastassiou, and Keith S. Pennington, "Graphics Image Coding for Freeze-Frame Videoconferencing", IEEE Transactions on Communications, vol. 37, No. 5., pp. 515-522, May 1989.

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