Ms. Yi Huang Profile

Yi Huang

at Univ of Electronic Science and Technology of China

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Proceedings Article | 15 November 2007 Paper

Rapid and effective method of quality assessment on sequence iris image

Yi Huang, Zheng Ma, Mei Xie

Proceedings Volume 6786, 678620 (2007) https://doi.org/10.1117/12.749188

KEYWORDS: Iris, Iris recognition, Image quality, Image processing, Wavelet transforms, Beryllium, Electronics engineering, Barium, Communication engineering, Motion analysis

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This paper proposes a multiple-step method of quality assessment on sequence iris images. Based on the spatial domain and frequency domain of image feature-vector space, the method sets different criteria in different steps to eliminate poor-quality images: firstly to judge the intensity and clarity of iris images roughly; secondly to preprocess iris images by making morphological operation, extract the region of interest(ROI) which covers pupil by blocking image and then make binary-conversion of iris image and locate pupil; thirdly to select different ROI, analyze the factors affecting image quality, such as defocus blur, motion blur, eyelid closure, eyelashes shelter, dynamic characteristics of eyeball, etc., and eliminate substandard images from the target sequence; lastly to set a comprehensive criteria to select the best quality image from the sequence. The method is verified by 300 sequences of iris images and experimental results show that only through locating pupil instead of utterly locating the outer edge of iris can this method quickly and precisely judge whether iris is sheltered and blurred or not, and that each of its steps can almost eliminate substandard images, thus not only reducing the number of iris images to be assessed but also saving the time of processing images.

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