![]() You could improve the quality by sampling longer, but at the cost of framerate. Infrared wavelengths have even less power than visible light wavelengths, so the sampled values received by a CCD pixel are both generally smaller and of a smaller range. ![]() Thermal cameras work similar to low-light cameras, only they focus on infrared (vs. Orders of magnitude worse than corresponding daytime imagery. Now consider the image quality of a typical night-vision camera (like this YouTube video): it's both noisy and low-resolution, even for static parts of the video. Indeed, we now have affordable, consumer-grade 4K camera CCDs that could operate at 120fps the reasons that 4k/120 isn't the standard are more about processing power and connectivity bandwidth. Thanks to the (comparatively) high power of visible light, the CCD pixel inputs of the camera can sample incoming light at very short exposure times and can generate very high-quality image data at high resolution and framerates. Normal daytime camera images work on visible light. The underlying reason might be technical.
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