Fast vignetting reduction method for digital still camera

The effect of vignetting is undesirable in image processing and analysis. It cause fall-off of pixel intensity from centre towards edges of the image. In this paper, we propose a new procedure of fast vignetting reduction based on two images acquired with different camera/lens settings. The change of lens aperture or focal length will also change the effect of vignetting in images. These differences are used to estimate a vignetting function, which is used for vignetting reduction. The obtained image after vignetting reduction is not significantly different from the image without vignetting.