![]() ![]() ![]() Once the pixels are shifted out the reset gate is triggered (integration clear gate - ICG) which clears away the potentially accumulated charge so we can capture the light again into empty potential wells.īefore I jump into the coding part, I would like to share all the formulas that I am going to use for the coding, so you can have a general understanding of how these numbers are obtained.įirst of all, we will work with square waves, more precisely PWM (Pulse Width Modulation) signals with different duty cycles. The stepping is done by the shift register. Once the exposure is done, the content of the capacitors is being shifted out step-by-step. If the toggling of the shift gate is slower (long integration time), the image might appear brighter or even over-exposured. If the shift gate (SH) is clocked often (short integration time), the accumulated charge will be small, therefore the image might appear darker. Each capacitor (pixel) will hold a charge proportional to the light it was exposed to. ![]() The photoactive layer which is located on the top of the CCD captures the light and converts it into electric charge. Each pixel is basically a capacitor that holds charge which is proportional to the amount of incident light. It is a piece of semiconductor that can capture light, transform it into electrons and electronic signal. First, I want to talk about CCDs in general, so you can understand how they work and why do we program it in a way we do.ĬCD stands for Charge- Coupled Device. ![]()
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