Method and apparatus for thresholding images in pipeline fashion

Details Method and apparatus for thresholding images in pipeline fashion Method and apparatus for thresholding images in pipeline fashion

1994-05-03

1996-09-03

Razavi, Michael T.

Image analysis

Image enhancement or restoration

Variable threshold, gain, or slice level

382303, 358466, G06K 938

Patent

active

055531679

ABSTRACT:
An adaptive thresholding filter generates multiple threshold values for use in thresholding the multi-bit pixels of a gray-scale input image. Each threshold value is based on a current white reference value and a current black reference value. The current white reference value is selected based on a comparison of the current image pixel to a white reference comparator value generated by applying a white reference aging function to a prior white reference value. The current black reference value is selected analogously using a black reference comparator value and a black reference aging function.

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Digital Image Processing, by Rafael C. Gonzalez and Paul Wintz, Chapter 7, "Image Segmentation," Addison-Wesley Publishing Company (1987), pp. 331-390.

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