Patent ID: 8866938
Filing Date: 2014-10-21
Classification: B61L,G06K,G06T,H04N

Abstract:
1. An apparatus for reducing persistent shadows within an image, the apparatus comprising: a camera configured to generate at least two frames of the image; and at least one computer processor for calculating an average normalized brightness for each pixel in the image over the at least two frames and adjusting a brightness of each pixel with the average normalized brightness of each pixel; wherein the computer processor is further configured to: calculate an average row brightness for each row of pixels in the image; calculate a normalized brightness for each pixel within each row by dividing the brightness of each pixel by the corresponding average row brightness; average the normalized brightness of each pixel over the at least two frames; and wherein adjusting the brightness of each pixel with the average normalized brightness of each pixel includes dividing the brightness of each pixel by the average normalized brightness of that pixel.