It's a bird

by Vian Esterhuizen

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A few cameras that have image stabilization built into the body can take a sequence of images with the sensor moved slightly in each one. The images are then combined to generate one image with higher resolution than the sensor can provide in a single frame. It's possible that phone-based cameras might do something similar using an accelerometer to detect ...


Shot noise goes with the square root of the number of photons, so every time you have 1/4 the photons you have 2x the noise (with respect to the signal). (Example - 400 photons has 20 average noise, 100 photons has 10, so go from noise is 1/20 to 1/10.) Note that pixel electron capacity goes down as ISO goes up, as there is a limit as to how far you can ...


Yes, if the sensor is truly a 1600x1200 (two megapixel) device and the camera is artificially generating 5 megapixel images, then yes, one could say "extrapolated" — or, dishonest, pointless scammery, since this doesn't provide you with any real advantages. To be pedantic, we wouldn't say that the sensor is extrapolated. We would say that the 5mpix image is ...


For one camera, the black level of the sensor will make the output non-zero when it is covered. That is actually not correct. The purpose is the opposite. The "Black Level Calibration" output is a negative voltage, and it works so that when the lens is covered, the input on the ADC is zero. So the dynamic range is reduced from 0~1023 t0 0~960. Am ...


We're there. Diffraction and color (wavelength) determine the physical limits on resolution at the sensor surface. The best explanation of this (and the many related practical considerations for digital imaging sensors) is from Once two airy disks become any closer than half their ...

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