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Filters Factor into Optical Imaging

机译：将因子滤除到光学成像中

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Many articles have been written about how various types of optical filters can be used to improve the contrast of images. Surprisingly, there has been little written about the quality of these filters and what effect they may have in an optical system. In some imaging systems, for example, the quality of a filter can have little to no effect; in others, filter quality can significantly alter the final image obtained by the optical system. During the manufacturing process, optical glass filters are typically ground and polished, although some are only melted and cured to shape. When the filter is of high quality, precision grinding and polishing results in less image degradation because there will be negligible transmitted wavefront error. Although manufacturing precision ground and finely polished filter glass takes time, the added cost differential is nominal in relation to the cost of the machine-vision system. The difference in the final image that results from the integration of such precision filters over those of inferior quality can be dramatic.
机译：关于如何使用各种类型的光学滤光片来改善图像的对比度的文章已有很多。令人惊讶的是，关于这些滤光片的质量以及它们在光学系统中可能产生的影响的文献很少。例如，在某些成像系统中，滤镜的质量几乎没有影响，甚至没有影响。在其他情况下，滤镜质量会极大地改变由光学系统获得的最终图像。在制造过程中，光学玻璃滤光片通常会被研磨和抛光，尽管有些只会熔化并固化以成型。当滤光片为高质量时，精确的研磨和抛光可减少图像质量下降，因为透射波前误差可忽略不计。尽管制造精密研磨和精细抛光的滤光玻璃需要时间，但相对于机器视觉系统的成本而言，增加的成本差异是微不足道的。由于这些精密滤镜的集成而导致的最终图像与劣质滤镜之间的差异可能会非常明显。

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