Apparatus and method to localize rectilinear contours in a digitized image for recognizing shapes at a scene. The gradient of the gray level function of the image at the position of each pixel is determined, and those pixels which constitute a contour pixel are identified. The identified contour pixels...http://www.google.de/patents/US5233670?utm_source=gb-gplus-sharePatent US5233670 - Method and device for the real-time localization of rectilinear contours in a digitized image, notably for shape recognition in scene analysis processing
