Experimental Results of Coloured Circular Marker Radius Measurement Using a Camera Sensor
This paper presents the results of red coloured circular objects (markers) recognition and their dimension measurement, using a camera sensor. It also outlines the fundamental processes of vision based radius measurement of red coloured circular markers. In an experiment, the camera was fixed at the ceiling of 2.8.m distance from the working surface. Initially, the camera modeling and environment mapping were done using a checkerboard sheet and then the camera is used to measure the radius of given marker that is placed in the environment. The blob analysis in MATLAB is used for coloured object recognition, contour tracing and then linear least squares technique for radius measurement. The measured dimension of a circular marker is obtained both in pixels (image coordinates) and in mm (world coordinates). The accuracy in radius measurement recorded by the experimental set up is @ 97 %. The technique presented, can also be used in vision based robot or autonomous vehicle navigation for object and its shape recognition, during navigation
Disclaimer/Regarding indexing issue:
We have provided the online access of all issues and papers to the indexing agencies (as given on journal web site). It’s depend on indexing agencies when, how and what manner they can index or not. Hence, we like to inform that on the basis of earlier indexing, we can’t predict the today or future indexing policy of third party (i.e. indexing agencies) as they have right to discontinue any journal at any time without prior information to the journal. So, please neither sends any question nor expects any answer from us on the behalf of third party i.e. indexing agencies.Hence, we will not issue any certificate or letter for indexing issue. Our role is just to provide the online access to them. So we do properly this and one can visit indexing agencies website to get the authentic information. Also: DOI is paid service which provided by a third party. We never mentioned that we go for this for our any journal. However, journal have no objection if author go directly for this paid DOI service.