| 摘要 |
This invention relates to a method for digitally processing an image in the form of a digitised black and white video picture in order to locate the edges and/or corners of objects in the image. The method works by comparing, for each point or element in the digitised image or array, the brightness of elements located within a predetermined region (eg 2, 4, 6 etc) centered on the chosen element with the brightness of the element itself to determine those elements having substantially equal brightness. All of these elements are regarded as belonging to the same surface in the image. The method then locates those elements which are associated with a minimum number of equally bright elements within their local region and these located elements will lie on or close to an edge of the image. Once the edge elements have been located in this way, standard methods of non-maximum suppression and edge thinning can be applied to find the position of the edge more accurately. Corners appear as elements associated with lower minima because there are fewer equally bright elements in the vicinity of a corner than around an edge. |
