Patent ID: 7535517
Filing Date: 2009-05-19
Classification: H04N

Abstract:
1. A method of reducing noise in a sequence of digital video frames, comprising the steps of: estimating motion between a current noisy frame and a previous noise-reduced frame using a processor, to generate motion vectors indicating relative motion between the pixels in the current noisy frame and the corresponding pixels in the previous noise-reduced frame; and removing noise from the current noisy frame by computing the weighted average of pixels in the current noise frame and said corresponding pixels in the previous noise-reduced frame based on the motion vectors in the processor, to generate a noise-reduced output frame, wherein: the step of estimating motion further includes the steps of estimating motion between a current noisy frame g removing noise from the current noisy frame further comprises the steps of computing the weighted average further includes the steps of computing the weighted average of the pixel g wherein the step of generating the noise-reduced output frame ĝ wherein (dy,dx) is the motion vector of the pixel g w ŵ w