11_ch5_introx

11_ch5_introx - Image Restoration COMP344 COMP344 Image...

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Unformatted text preview: Image Restoration COMP344 COMP344 Image Restoration Motivation: CCD CCD: converts photons into electrons which are then stored in each pixel “well” The number of electrons stored in each pixel well is proportional to the number of photons that struck that pixel After an exposure has been completed, the electrons for each pixel are shifted out of the CCD and converted to a number COMP344 Image Restoration Noise in CCD Images Dark Current caused by thermally generated electrons that build up in the pixels of all CCDs CCDs build up dark current whether the CCD is being exposed to light or not the rate of dark current accumulation depends on the temperature of the CCD Question How can this be reduced? Solution: Dark frames Take exposure with the lens cap on so no light is getting to the CCD, and then subtract it offered on most DSLRs COMP344 Image Restoration Noise in CCD Images... Pixel Non-Uniformity each pixel has a slightly different sensitivity to light Question How can this be reduced?How can this be reduced?...
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11_ch5_introx - Image Restoration COMP344 COMP344 Image...

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