关键词: 背景减除, 边缘提取, 边界跟踪, 最小二乘法, 图像分割, 数学形态学

Abstract: According to the properties of cartridge’s bottom, a new method of image segmentation for bullet’s primer surface defect is proposed. The background of cartridge’s bottom image is decreased by the method of background subtraction, it applies Log operator to detect the circle edge of cartridge’s bottom, the disappointment of circle contour extraction by traditional boundary tracing is analyzed, the method of boundary tracing is improved to detect the cartridge’s bottom circle, the center and radius of circle are acquired accurately by the least square method. According to the radius relationship between the cartridge’s bottom and primer circle, it evaluates the cartridge’s bottom gray image to extract the image of primer. The primer surface defect is segmented by threshold, and the result of segmentation is optimized by mathematical morphology. The result shows this method can extract the bullet’s primer surface defect effectively.

Key words: background subtraction, edge extraction, boundary tracing, least square method, image segmentation, mathematical morphology