Then, the proper grayscale threshold and edge-detector are selected to obtain the binary image and the target boundary.
选取适当的阈值和边缘检测算子对候选目标进行图像二值分割和边缘提取；
In first part, describing how the line detector is constructed from the edge detector.
首先阐述了从边缘探测器中建构线状探测器。
Morphological gradient is a nonlinear edge detector that can overcome the some drawbacks of the linear edge detector. Wide edges detected by morphological gradient cause the low edge resolution.
数学形态学边缘检测器能克服线性边缘检测器的一些缺点，但是存在宽边缘，导致边缘分辨率较低。
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