Image processing system and method for recognizing and removing

Details Image processing system and method for recognizing and removing Image processing system and method for recognizing and removing

1991-05-08

1996-02-27

Boudreau, Leo

Image analysis

Pattern recognition

Feature extraction

382174, 382274, G06K 948

Patent

active

054955360

ABSTRACT:
The shadow contrast sensitivity of the human vision system is simulated by configuring information obtained from an image sensor so that the information may be evaluated with multiple pixel widths in order to produce a machine vision system able to distinguish between shadow edges and abrupt object edges. A second difference of the image intensity for each line of the image is developed and this second difference is used to screen out high frequency noise contributions from the final edge detection signals. These edge detection signals are constructed from first differences of the image intensity where the screening conditions are satisfied. The positional coincidence of oppositely signed maxima in the first difference signal taken from the right and the second difference signal taken from the left is used to detect the presence of an object edge. Alternatively, the effective number of responding operators (ENRO) may be utilized to determine the presence of object edges.

REFERENCES:
patent: 3701095 (1972-10-01), Yamaguchi et al.
patent: 4804842 (1989-02-01), Nakajima et al.
Runge et al., "Electronic Synthesis of the Avian Retina", IEEE Trans on Bio-Medical Engineering, vol. BME-15, No. 3, Jul. 1968, pp. 138-151.
D. Marr & E. Hildreth, "Theory of Edge Detection", Proceedings of the Royal Society of London, vol. 207, 1980, pp. 187-217.
Andres Huertus & Gerard Medioni, "Detection of Intensity Changes with Subpixel Accuracy Using Laplacian-Graussian Masks", IEEE Transactions on Pattern Analysis & Machine Intelligence, vol. PAMI-8 No. 5, Sep. 1986, pp. 651-664.

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