| 摘要: |
| 目的 机器视觉尺寸测量系统照明光源为复色光时， 色差会使图像边缘轮廓变得模糊， 主要研究色差对尺寸测量精度的影响。方法 以搭建的机器视觉尺寸测量系统为平台， 分别采用白色 （复色光）、 红色、 绿色、 蓝色的LED背光源作为照明光源， 采集标准圆柱体图像， 经软件系统处理后获得测量结果。结果 当照明光源为复色光时， 重复性测量误差和线性度误差分别在1 μm和2 μm以内； 当采用单色光作为光源时,重复性测量误差和线性度误差分别控制在0.5 μm和1 μm以内。结论 色差对机器视觉尺寸测量的重复性和线性精度都有影响， 可以采用单色光来避免色差， 从而进一步提高测量精度。 |
| 关键词: 机器视觉 尺寸测量 色差 测量精度 |
| DOI： |
| 分类号:TB486+.01 |
| 基金项目:山西省自然科学基金 （2013011025-1）；山西省研究生优秀创新项目 （20133095） |
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| Influence of Chromatic Aberration on the Size Measurement Accuracy of Vision |
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LI Xu, WANG Jun-yuan, ZENG Zhi-qiang, ZHANG Chuan-chuan, LIN Di
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North University of China， Taiyuan 030051， China
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| Abstract: |
| Chromatic aberration would make edge contours of the image become fuzzy when the light source of the size measurement system based on machine vision is chromatic. This paper mainly studied the influence of chromatic aberration on accuracy of size measurement. To acquire images and dimension measurement results of the standard cylinder, a machine vision measurement system was built as a platform and white (chromatic), red, green, blue LED light sources were respectively used with treatment by software. When the light source was chromatic, the repeatability error and the linearity error of measurement were within 1 μ m and 2 μ m; when using monochromatic light as the light source, the repeatability error and the linearity error of measurement were controlled within 0.5 μ m and 1 μ m. The experiment showed that chromatic aberration influenced the repeatability and the linearity accuracy of measurement of machine vision and the monochromatic light can be used to avoid chromatic aberration and to further improve the measurement accuracy. |
| Key words: machine vision size measurement chromatic aberration measurement accuracy |
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