3 results about "Iris localization" patented technology

This invention provides a method, apparatus, device, and storage medium for real-time iris tracking and localization. The method includes: performing multi-level convolution processing on a real-time input iris image to extract iris features at different scales, obtaining a feature map set; inputting the feature map set into a preset mask prediction model for mask prediction, obtaining a pupil boundary mask and an outer iris boundary mask; extracting the boundary contours of the pupil boundary mask and the outer iris boundary mask, obtaining a pupil boundary contour point set and an outer iris boundary contour point set; performing geometric fitting based on the pupil boundary contour point set and the outer iris boundary contour point set, and optimizing and correcting the fitting parameters according to the concentric constraint relationship between the iris and the pupil to obtain the iris localization result. This invention, by combining boundary enhancement feature fusion with geometric constraint optimization, can accurately locate the inner and outer boundaries of the iris in non-cooperative environments, improving the accuracy and robustness of iris localization.

The invention discloses a multi-modal biological characteristic acquisition method and an all-in-one machine, and the method comprises the steps: guiding a user to carry out face pre-positioning through a face positioning frame displayed by a main display screen and face positioning prompt information displayed by an auxiliary display screen; controlling a main display screen to display an iris positioning ring and a virtual glasses frame, displaying iris positioning prompt information through an auxiliary display screen, and guiding a user to coincide the virtual glasses frame with the iris positioning ring by moving the head; the method comprises the following steps: respectively monitoring a face image and an iris image of a user through a telescope type iris acquisition module and a wide-angle face acquisition camera, and evaluating quality scores of the images; and capturing the face image and the iris image of the user at the same moment under the condition that the quality scores of the initially acquired face image and the iris image are both greater than the corresponding threshold values. According to the method, seamless integration of a user multi-modal biological characteristic acquisition process, high self-service of an acquisition process and real-time controllability of acquisition quality can be realized.

The application discloses an iris positioning method, device and equipment and a storage medium. The method comprises the following steps: acquiring an iris image, wherein the iris image contains an iris to be positioned and a pupil; calculating a gray histogram of the iris image; calculating a pupil threshold of the pupil by using the gray histogram; performing a binary processing on the iris image based on the pupil threshold to obtain a pupil gradient image; calculating the iris image according to a pupil center and a pupil radius on the pupil gradient image; calculating iris edge points, an iris center and an iris radius of the iris image according to an optimal path of the iris image; determining an iris safe area according to the iris edge points, the iris center and the iris radius; calculating a mean value and a variance of the iris safe area to obtain an iris noise mask; and performing an exclusive or calculation on the iris noise mask and a ring mask to obtain an iris mask. The application can quickly position the iris and is not easily affected by noise, improves the positioning efficiency and positioning accuracy of the iris, and has wide applicability.