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Sensor Shading

Any image created using a lens and sensor arrangements will suffer from a non- uniform distribution of intensity, because even if the entire field of view has an even light distribution, the resulting image will suffer from uneven overall intensity. This shading can be caused by the lens (vignetting) or, as shown here, by the sensor.

Most camera sensors used for vision applications include microlenses that gather more of the available light and focus it onto the active pixel area.

However, under certain circumstances, when the incident light falls on the sensor at a very shallow angle, some of the light is refracted such that it no longer falls on the active area of the pixel. This effect is called 'microlens shading' and it can be particularly noticeable on sensors with asymmetric pixels.

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