caa a22 4500 46793701X CHVBK 20180406153000.0 cr unu---uuuuu 170328e20060501xx s 000 0 eng 10.1007/s00138-006-0020-8 doi (NATIONALLICENCE)springer-10.1007/s00138-006-0020-8 Efficient extraction of metric measurements for planar scene under 2D homography with the help of planar circles [Elektronische Daten] [Yisong Chen, Horace Ip] Extraction of metric properties from perspective view is a challenging task in many machine vision applications. Most conventional approaches typically first recover the perspective transformation parameters up to a similarity transform and make measurements in the resulting rectified image. In this paper, a new approach is proposed to allow quick and reliable Euclidean measures to be made directly from a perspective view without explicitly recovering the world plane. Unlike previous planar rectification strategies, our approach makes use of planar circles to help identify the image of the absolute conic, which makes it capable of performing effective rectification under many difficult cases that are unable to be treated with other rectification approaches. This is made possible by solving the images of the circular points in closed-form from the vanishing line and the image of one arbitrary planar circle and by exploiting the invariant relationship between the circular points and the absolute conic under projective transformation. Subsequently, planar Euclidean measures can be made directly from the image plane. The practical advantages and the efficiency of this method are demonstrated by experiments on both synthetic and real scenes. Springer-Verlag, 2006 Planar homography nationallicence Metric rectification nationallicence Ellipse fitting nationallicence Absolute conic nationallicence Circular points nationallicence Chen Yisong Centre for Innovative Applications of Internet and Multimedia Technologies (AIMtech Centre) and Department of Computer Science, City University of Hong Kong, Hong Kong, Hong Kong aut Ip Horace Centre for Innovative Applications of Internet and Multimedia Technologies (AIMtech Centre) and Department of Computer Science, City University of Hong Kong, Hong Kong, Hong Kong aut Machine Vision and Applications Springer-Verlag 17/2(2006-05-01), 139-146 0932-8092 17:2<139 2006 17 138 https://doi.org/10.1007/s00138-006-0020-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00138-006-0020-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chen Yisong Centre for Innovative Applications of Internet and Multimedia Technologies (AIMtech Centre) and Department of Computer Science, City University of Hong Kong, Hong Kong, Hong Kong aut NATIONALLICENCE 700 1- Ip Horace Centre for Innovative Applications of Internet and Multimedia Technologies (AIMtech Centre) and Department of Computer Science, City University of Hong Kong, Hong Kong, Hong Kong aut NATIONALLICENCE 773 0- Machine Vision and Applications Springer-Verlag 17/2(2006-05-01), 139-146 0932-8092 17:2<139 2006 17 138 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer