Cascaded video streaming iris image quality detection method

The invention provides a cascaded video streaming iris image quality detection method, which comprises the following steps of (a) collecting an iris image; (b) locating the iris image and judging the position of the iris image, and returning to the step (a) to recollect the iris image if failure in location or inappropriate position is judged; (c) judging the definition of the iris image on the basis of adaptive adjustment of the image saturation, and returning to the step (a) to recollect the iris image if the definition cannot conform to the requirement; (d) carrying out fuzzy judgment on the iris image on the basis of the analysis of light spot pattern, and returning the step (a) to recollect the iris image if the motion fuzz exists in the iris image; and (e) judging the shielding degree of the iris image on the basis of the weight of a district, and returning to the step (a) to recollect the iris image if the iris image is severely shielded. The iris image quality detection method can be applied to a complex scene and is a rapid and accurate cascaded iris image quality detection method.