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What is smear?

April 26, 2017smear

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What is smear?

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Smear refers to an unwanted artefact in the image, showing up as a vertical stripe (vertical streak) from the top down to the bottom of the image, emanating from the bright parts of the image. The reason for smear in interline transfer CCD sensors is the scattering of light into the vertical shift register during the readout phase. Shorter shutter times make smear more obvious. Using strobed light sources can eliminate smear, so that no light is hitting the image sensor during readout. Implementing special readout modes can reduce smear.