Artificial Intelligence Laboratory, Stanford University, CA 94305.
IEEE Trans Pattern Anal Mach Intell. 1987 Mar;9(3):446-51. doi: 10.1109/tpami.1987.4767926.
Most step-edge detectors are designed to detect locally straight edge-segments which can be isolated within the operator kernel. While it can easily be demonstrated that a cross-sectional support of at least 4 pixels is required for the unambiguous detection of a stepedge, edges which cannot be isolated within windows having this width can nevertheless be resolved. This is achieved by preceding the stepedge detection process by image-intensity interpolation. Although resolution can be improved in this fashion, the step-edge position and intensity estimates thus determined may be subject to systematic biases. Also, the higher resolution performance is accompanied by lower robustness to noise.
大多数台阶边缘检测器被设计用来检测局部直线边缘段，可以在算子内核中对其进行隔离。虽然很容易证明，为了明确地检测到台阶边缘，至少需要 4 个像素的横截面支持，但在宽度为该值的窗口中无法进行隔离的边缘仍然可以被分辨。这可以通过在台阶边缘检测过程之前进行图像强度插值来实现。虽然这种方式可以提高分辨率，但由此确定的台阶边缘位置和强度估计可能会受到系统偏差的影响。此外，更高的分辨率性能伴随着对噪声的鲁棒性降低。
