Patent ID: 8654217
Filing Date: 2014-02-18
Classification: G06K,H04N

Abstract:
1. A system for detecting dust on an image sensor of an image apparatus that records a captured image of an actual scene, the system comprising: a control system that evaluates information from a hue channel and a value channel of the captured image of the actual scene to determine if there is dust on the image sensor; wherein the control system computes a probability of dust on the image sensor based on the evaluated information from the hue channel and the value channel of the captured image; and determines if there is dust on the image sensor based on the computed probability; wherein the probability is expressed as P(V=v|H=h)=P(H=h|V=v)P(V=v)/P(H=h), where P is the probability, V is a variable that embodies the image value, H is a variable that embodies the image hue, v is a value score, and h is a hue score; and wherein a possible region of dust is one that has a value score that is statistically unlikely in view of a hue score for that region.