Image analysis – Histogram processing – For setting a threshold
Patent
1991-06-14
1993-12-14
Moore, David K.
Image analysis
Histogram processing
For setting a threshold
382 22, 382 27, G06K 940
Patent
active
052710645
ABSTRACT:
An apparatus and method for enhancing image data elements used to form a gray scale image are disclosed. The apparatus includes an adaptive neighborhood mask that is applied to a group of data image elements centered about a selected pixel to segregate the elements into center and surround regions about the selected element or pixel. The mask further modifies the elements with weighting factors to derive a contrast vector for the selected data elements in the adaptive neighborhood. This vector is compared to a smoothing window and a pair of edge enhancement windows to determine whether the selected element requires smoothing or enhancement to more clearly define a surface or an edge, respectively. If the element requires smoothing or enhancing, its gray scale value is modified, otherwise it is not modified. The device performs this task for each data element. The enhanced data is analyzed to determine if further enhancement is possible and, if so, the process continues upon the adjusted data until the enhancement of the image data is maximized. An edge area selector may further enhance the image data elements by selecting a small group of elements at the unterminated end of a detected edge in the enhance image. The selected group is enhanced by adjusting the edge enhancement window or by changing the weighting factors and restoring the gray scale values of the selected group to their unenhanced values.
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Dhawan Atam P.
Dufresne Thomas E.
Moore David K.
University of Cincinnati
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