Sharp CD-G22000 Especificações descarregar pdf (Página 39)

Illustration 17: The raw image

downloaded from the camera

The Dark frame is taken with the same exposition time at the same CCD chip

temperature. Because hot pixels are less stable than normal pixels, it is always

better to take more dark frames (at last 5) and to create resulting dark frame as

their average or better median.

Illustration 18: The dark frame

corresponding to the above raw image

Illustration 19: The raw image with

subtracted dark frame

Subtraction of the dark frame eliminated majority of thermal noise, but

unevenly illuminated field is still obvious. Image center background is much

brighter than the border parts.

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Sharp CD-G22000 Especificações Página 39