| 摘要 |
A method for identifying features in an image comprises: from a first location, scanning the image along a scan path in a scan direction away from the first location so as to detect a border in the image at a second location, mapping a path defined by the border in a first direction along the border from the second location, the path being mapped in dependence on a border quality measure, determining whether the mapped path forms a perimeter and if the mapped path does form a perimeter, scanning the image from the mapped path so as to detect a further border in the image or if the mapped path does not form a perimeter, mapping a path defined by the border from the second location in a second direction along the border that is different to the first direction. After having traced a border its quality and/or its circumference or length may be compared with a threshold and discarded if it does not exceed it. The border detection method may comprise estimating an attribute for each of a set of two adjacent pixel positions in the image and determining that a border is present if a predetermined binary condition that may be based on a Laplacian or Gaussian filter differs in respect of the two pixel positions. |
