The pixel level corners were detected by classical Harris corner detector, and then some methods were used to get sub-pixel accuracy.
针对摄像机标定模板图像的角点检测问题，提出了两种简便而有效的亚像素级精度的提取算法。
The stress-strain concentration is detected at the corner of Cu pad, the lower stress for the outer of Cu pad.
通孔拐角附近是应力应变的集中区，沿界面至焊盘外缘，应力应变逐渐降低。
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