Method for detecting existence of dust spots in digital images based on locally adaptive thresholding

摘要

A method for detecting a dust spot (16) in a digital image (10) includes the steps of determining (226) an expected dust spot configuration (344) of the dust spot (16) in the image (10); applying (228) a statistic order filter to a value channel of an HSV color space of the image to generate a filtered value for each pixel being evaluated (349), the filtered value being based upon the expected dust spot configuration (344); and comparing (230) the filtered value to an actual color space value of a plurality of pixels (348) in the digital image (10) to generate (232) a binary image (350). In one embodiment, the method can also include the step of comparing (234) the binary image (350) to the expected dust spot configuration (344) to determine a probability of the presence of the dust spot (16) in the digital image (10).