Halo-based black point detection method of microchannel plate
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摘要: 根据微通道板黑点检测原理与黑点光晕特征设计了一种检测方法，该方法利用圆提取技术实现荧光屏图像的半径和圆心提取，通过高斯拉普拉斯算子实现目标黑点粗检测。基于黑点在不同电压下外围呈现光晕的特征，利用对比度受限的直方图均衡化并结合阈值分割的光晕检测法实现黑点光晕的提取。测试结果表明，该方法可以将荧光屏划痕、灰尘与微通道板黑点有效区分，从而实现黑点的自动提取。Abstract: According to the black spot detection principle and black spot halo characteristics of the microchannel plate, a detection method was designed. The circle extraction technology was used to realize the radius and circle center extraction of the fluorescent screen image, and the gaussian Laplacian was used to realize the coarse detection of the target black spot. Based on the characteristics of black spot presenting halo in the periphery at different voltages, the black spot halo was extracted by using the histogram equalization with restricted contrast and combined with the threshold segmentation of the halo detection method. The test results show that the proposed method can effectively distinguish the fluorescent screen scratches, dust and black spots of microchannel plate, so as to realize the automatic extraction of black spots.
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Key words:
- microchannel plate /
- visual performance /
- defect detection /
- halo detection /
- threshold segmentation
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图 1 荧光屏划痕、灰尘图以及MCP黑点图
Fig. 1 Diagram of fluorescent screen scratches, dust and black spots of microchannel plate
图 11 不同电压下黑点光晕提取图
Fig. 11 Extraction diagram of black-spot halo under different voltages
表 1 各边缘检测算子检测结果
Table 1 Detection results of each edge detection operator
检测方法 检测时间/s 圆心坐标 半径 Canny 1.324 (2 556,1 900) 1 651 Sobel 0.433 (2 556,1 902) 1 651 Prewitt 0.728 (2 556,1 902) 1 652 Roberts 0.688 (2 558,1 901) 1 651 
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表 2 三种方法粗检测结果
Table 2 Coarse detection results of three methods
序号 文献9方法 Canny检测 本文方法 时间/ s 数量 T/F 时间/ s 数量 T/F 时间/ s 数量 T/F 1 30.273 6 186 T 9.800 285 F 21.412 133 T 2 32.518 9 937 T 9.102 286 T 22.230 493 T 3 34.190 12 093 T 9.161 701 T 22.152 277 T 4 29.725 4 619 T 9.296 78 F 21.742 37 T
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表 3 疵点检测结果表
Table 3 Detection results of defects
序号 疵病类型 半径/ μm 机器检测结果 人工检测结果 序号 疵病类型 半径/μm 机器检测结果 人工检测结果 1 黑点 96 小黑点 小黑点 7 正常 0 − − 2 正常 0 − − 8 黑点 160 大黑点 大黑点 3 黑点 84 小黑点 小黑点 9 黑点 125 小黑点 小黑点 4 黑点 91 小黑点 小黑点 10 黑点 96 小黑点 小黑点 5 黑点 79 小黑点 小黑点 11 黑点 136 小黑点 小黑点 6 正常 0 − − 12 黑点 124 小黑点 小黑点
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