Because of the physical differences between a mono and color sensors, as well as the differences between a sensor manufacturer&#;s technologies and pixel structure, different sensors will sense light to varying degrees. One way to get a more accurate understanding of a sensor&#;s sensitivity to light is by reading its spectral response chart (also known as a Quantum Efficiency Chart).
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The 2 charts below are the mono and color versions of the same sensor model. The left shows the spectral response of a mono sensor and the right of a color sensor. The X axis is the wavelength (nm) and the Y axis is quantum efficiency (%). The majority of machine vision color cameras have IR cut filters installed to block near-IR wavelengths. This removes IR noise and color cross-over from the image, best matching how the human eye interprets color. However, in a number of applications it can be beneficial to image without the IR cut filter. Whether or not an IR cut filter is installed a color sensor will never be as sensitive as the mono sensor.
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