High-precision angular point detection method and system for long-focus camera calibration

• Main Authors: LIU YAN, TANG MINGJUN, YUAN JIANG, GU YOULIN, CHEN JUN, YUAN YE, HU XUELONG
• Format: Patent
• Language: Chinese; English
• Published: 05.08.2022
• Subjects: CALCULATING; COMPUTING; COUNTING; IMAGE DATA PROCESSING OR GENERATION, IN GENERAL; PHYSICS

The invention discloses a high-precision angular point detection method for calibration of a telephoto camera, and the method comprises the steps: carrying out the selection of regions of interest (ROI) based on a checkerboard image collected by the telephoto camera, carrying out the Harris angular point detection of all regions of interest (ROI), carrying out the RANSAC processing of a random sample consensus algorithm, and then carrying out the sub-pixel-level angular point positioning processing. And obtaining angular point coordinates of the checkerboard image. In the invention, according to the checkerboard image acquired by the long-focus camera, the steps of ROI (Region of Interest) selection, Harris corner detection, RANSAC (Random Sample Consensus) algorithm processing, sub-pixel precision and the like are utilized, so that the corner detection of the checkerboard image is more convenient and faster, the precision is high, and the consumed time is less; and through an automatic program, the operation