Objectives:The circular coded marker is widely used in close-range photogrammetry,and has excellent characteristics that are independent of translation,rotation,and scaling.The robust recognition and decoding of the circular coded markers are of great significance to the subsequent 3D reconstruction.Methods:Aiming at the identification of coded marks in complex environments such as cluttered back-grounds and uneven lighting,a two-step contour screening strategy is proposed.First,coarse screening is performed based on the contour length and roundness,and then fine screening is performed based on statis-tical analysis on gray-scale distribution.Results:The experimental results show that when the shooting an-gle is less than 75° and the size of the code point is greater than 30 pixels,the proposed method can guaran-tee high accuracy in recognition and decoding.In a complex environment,the recognition accuracy and de-coding accuracy are 99.53％ and 100％ ,respectively,and the false recognition rate is 0％ .Conclusions:The proposed method can effectively reduce the false recognition rate and have a good recognition effect in a complex environment.
万方数据
维普
