1. Quantitative design and evaluation of enhancement/thresholding edge detectors;Abdou,1979
2. Utilisation of a single type of orthogonal polynomial based operators for image analysis;Bhattacharyya,1984
3. A note on certain methods of testing for homogeneity of a set of estimated variances;Bishop;Biometrika,1939
4. A computational approach to edge detection;Canny;IEEE Trans. Pattern Analysis and Machine Intelligence,1986