Method and apparatus for improving dimensional measurements made

Details Method and apparatus for improving dimensional measurements made Method and apparatus for improving dimensional measurements made

1993-05-11

1995-08-08

Chin, Tommy P.

Television

Monitoring, testing, or measuring

348184, 348185, 348193, H04N 521, H04N 1700

Patent

active

054403383

ABSTRACT:
Video cameras, such as charge coupled device cameras, are used for optically making spatial measurements. For example, such cameras are used for laser beam analysis. Such cameras also have drawbacks including baseline offset error and poor signal-to-noise ratio. By adjusting the baseline so that both noise and the desired signal produce only positive digital counts, deriving a baseline offset level with only noise, and then subtracting the baseline offset level from subsequent frames Containing data representing both noise and the desired signal, the baseline offset is corrected. With the baseline offset being corrected, signal-to-noise ratio improving techniques, such as frame averaging and results averaging, can be applied to extract the desired signals which would otherwise be buried in the noise. The method and apparatus is particularly suited to laser beam performance evaluations.

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