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With the rapid development of artificial intelligence, object detection is playing an important role in the field of computer vision. Instead of anchors, we use pixel classification inspired by Semantic Segmentation to get the local extreme points of the four boundaries of an object and then the boundary positions. We calculate the possibility whether every pixel in the image is the extreme point by hourglass network. With the introduction of the mask mechanism and oblique convolution, thedoi:10.1109/access.2020.2971058 fatcat:ztlyszsm2ndbznob6r4wfkhr3e