Verfahren zur Detektion von Kanten in einem Bildsignal

摘要

An edge detection process uses binary morphological erosion. For that purpose, a binary image (S1) is generated from the grey-tone input image (S). A structure element is progressively guided over the binary image (S1) and generates a shrunk binary image (S2) according to erosion rules. By calculating the difference between the first binary image and the shrunk binary image (S1, S2), an output image (Q1) in which the edges are preserved is generated. In a further development of the invention, a further erosion rule based on a grey tone threshold is applied to the eroded binary image (S2) and the difference between this grey tone-based eroded image (S3) and the input binary image (S1) is calculated to generate an output image (Q2) which also contains hidden edges.