Binarization system for an image scanner

Details Binarization system for an image scanner Binarization system for an image scanner

1997-06-11

1999-06-22

Chang, Jon

Image analysis

Image enhancement or restoration

Variable threshold, gain, or slice level

358466, G06K 938

Patent

active

059150491

ABSTRACT:
A first aspect of the present invention provides a white level setting system for an image scanner. The system compares an analog image signal obtained by scanning an original or a white reference with a predetermined analog white level signal, to provide a digital image signal corresponding to an image on the original, calculates a white level for the next scan line according to the digital image signal, and employs the white level for the next scan line. A second aspect of the present invention provides a binarization system for an image scanner. The system divides read image data into predetermined unit blocks, finds rates of changes in gray levels in each of the blocks, detects edges of the image data according to the rates of changes, determines a slice level for each of the blocks according to the gray levels of the edges, and converts the image data of each of the blocks into binary data according to the slice level.

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Gonzalez et al. Digital Image Processing. Addison-Wesley. 1992. pp. 197-201, 418-420.

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