(It is however significant in astronomy because of the very long exposure times of several seconds or more, which allows appreciable dark current electrons to accumulate during the exposure.) The camera specs in our example only provide us with the total dark noise, which is not surprising since dark current is not very significant in microscopy or machine vision. Typically we deal with two sources of dark noise: readout (or just "read") noise and dark current. Dark noise (not to be confused with dark current) refers to the noise in the pixels when there is no light on the camera. Step 3: Simulate read noise and dark current ¶įollowing the schematic of the camera model above, we see that we next need to add the dark noise. This step is a bit cumbersome, and in the rest of what follows I will skip this step and will use a set number of photons directly as the input to the simulations, rather than a scalar field.
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