SCANNING: PHOTOGRAMMETRY

The role of photogrammetry in mapping physical objects into a codable environment (image acquisition and image measurement). Mathematical relations between acquired images and object space to record the information. The direct and inverse problems of projective and similar coordinate transformations is solved by the photogrammetry software. Cordiantions of collinearity and coplanarity are also assimilated to be utilized. The first stage is camera alignment, where common points on photographs and matches them, as well as finds the position of the camera for each picture and refines camera calibration parameters. As a result a sparse point cloud and a set of camera positions are formed. The next stage is generating dense point cloud, that is built by PhotoScan based on the estimated camera positions and pictures themselves. Dense point cloud may be edited and classified prior to export or proceeding to the next stage. The process is further used to analyse the point deviation from the original Stereo-model by means of error analysis.