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Automatic recognition and extraction of circle marked point in full images of photogrammetry

SUN Peng1,Lü Nai-guang1,WANG Bo-en2,LIN Yi-min2(1.Beijing Key Laboratory:Measurement and Control of Mechanical and Electrical System,Beijing Information Science and Technology University,Beijing 100192,China;2.School of Photoelectric Information and Telecommunication Engineering, Beijing Information Science and Technology University,Beijing 100192,China)  
An automatic marked point extraction method in the whole image is proposed in this paper.Based on traditional ellipse fitting method,this method proposes a shape error for imaging quality assessment,which not only avoids background spots' effect greatly,excludes shapely defective points,but also guarantees and controls spot center location accuracy.Application of this method into photogrammetry results in subpixel accuracy and improvement in marked point detection ability and quality.
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