METHOD FOR NOISE-IMMUNE GRADIENT DETECTION OF OBJECT CONTOURS ON DIGITAL IMAGES

摘要

FIELD: information technology.;SUBSTANCE: position of pulse noise on the image is evaluated first, after which four auxiliary masks are formed, as well as eight control vectors (two vectors based on each auxiliary mask), and coefficients of corresponding four differently aligned Prewitt masks are then changed using given vectors. Further, the given masks are used to calculated the approximate value of the modulus of the image gradient, and contours of the object on the image are obtained through its threshold conversion.;EFFECT: higher sensitivity of the noise-immune gradient method of detecting contours to useful contour features of the image.;5 dwg