The authors introduced the basic concepts and properties of soft mathematical morphology applicable to gray-scale image and performed edge detection processing for the IR image of a ship by MATLAB.

在介绍适用于灰度图像的柔性形态学概念及特性的基础上，结合红外舰船图像实例，用MATLAB实现了灰度图像的形态学边缘检测。

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Discuss applicability of gray correlation degree in image edge detection and puts forward and fulfils an algorithm of image edge detection based on gray weighted absolute correlation degree.

探讨了灰色关联度计算方法在边缘检测中的适用情况，提出并实现了基于灰色加权绝对关联度的灰度图边缘检测算法。

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Owing to the difficulties in extracting iris edge image, a new iris location algorithm using geometric symmetry feature and edge detection from gray scale image is presented.

针对虹膜二值边缘图像提取的困难，提出利用虹膜图像的灰度边缘图像以及虹膜的几何特征进行虹膜定位的快速算法。

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