07 Dec '17, 6pm

Understanding CCD Camera Resolution And Dynamic Range

Signal-to-noise ratio (SNR) is critical when looking at subtle differences in light frame measurements. Radiant Vision Systems mura and defect detection systems, for example, rely heavily on it. Suppose we would like to detect a very small particle defect in a display that varies in contrast only slightly from neighboring areas. For the sake of the example, we’ll suppose the size of this defect is only 1x1 CCD pixel for a 29MP measurement. To repeatedly detect this defect without many false positives, the defect contrast should be 6 standard deviations beyond the CCD measurement noise level. If we use the value above for light frame noise level, 6 standard deviations of noise is 4.2%. So, for a very small particle defect, the system would increasingly confuse noise with the defect of interest as the contrast of this defect falls below 4.2%. This is illustrated in the follo...

Full article: https://www.sensorsmag.com/components/understanding-ccd-c...

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