Calibration board, corner detection method and device and readable storage medium

The invention relates to a calibration board, a corner detection method and device and a readable storage medium. The middle area of the circular pattern array on the calibration plate comprises at least one group of first pattern combination, and the first pattern combination comprises two adjacent first circular patterns; the edge area of the circular pattern array comprises a plurality of second circular patterns, the color of the first circular patterns is different from that of the second circular patterns, and a preset distribution relation exists between the first circular patterns and the second circular patterns. The method comprises the steps of obtaining a calibration image of a target area, wherein the target area comprises a calibration plate; identifying pixel coordinates of circle centers of a plurality of first circular patterns in the calibration image; pixel coordinates of circle centers of a plurality of second circular patterns are determined according to the pixel coordinates of the circl