Vignetting is a reduction of an image's brightness at the periphery compared to the center of the image. It describes the effective falloff in irradiance for off-axis points for imaging systems.
In real imaging systems, the image brightness is often reduced at the periphery compared to the center of the image. This effect is known as vignetting and is undesirable for computer vision algorithms that rely on measured pixel intensities. Vignetting can be caused by several mechanisms. The image irradiance varies across the field of view according to the fourth power of the cosine of the field angle. This off-axis illumination falloff is one of the prominent reasons for vignetting and is also referred to as cosine-fourth falloff .
Vignetting can also be caused by optical and mechanical effects. Light rays arriving at oblique angles to the optical axis may be obstructed by the aperture stop, lens rim, or improper...
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