Image analysis – Image enhancement or restoration – Variable threshold – gain – or slice level
Patent
1991-07-11
1996-04-09
Couso, Yon J.
Image analysis
Image enhancement or restoration
Variable threshold, gain, or slice level
382272, G06K 936
Patent
active
055069177
ABSTRACT:
In a thresholding method for segmenting gray scale image which is less dependent on the concentration distribution of the input image, the threshold in determined as a zero-cross point of a histogram difference between the concentration histograms for the gray scale image within the window at a window position at which the window contains more high concentration region and at a window position at which the window contains more low concentration region. Also, in a method of determining a background concentration distribution from an image having an arbitrarily distributed pattern, the background concentration level is determined as a peak concentration or a mean value concentration of a low concentration section of the histogram difference of the concentration histograms for two associated windows. Also. in an image displacement detection method capable of detecting a displacement of a pattern in a two dimensional image accurately by using only a one-dimensional pattern matching without any period mismatching error even for an image of a repetitious pattern, the discplacements in the vertical and lateral direction which are locally minimum and for which a discrepancy in an oblique direction is minimum are selected as the actual displacements.
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Ito Minoru
Watanabe Toshifumi
Couso Yon J.
Nippon Telegraph and Telephone Corporation
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