Automatic Extraction Algorithm of Mark Centers in Close range Photogrammetry

Abstract:

An automatic algorithm was proposed for extracting center of irregular shape mark in the close range photogrammetry. Combined with close range photogrammetry engineering practice and based on photogrammetry control information, the edge of man made mark was detected by using adaptive canny operator, then, reconstructed via automatic clustering. A case study of the Meridian Gate of the Forbidden City in Beijing and Wuhan University Campus’s Flag Station Building surveying projects proves that the method greatly reduces the workload of the mark measurement.

Key words:measurement mark extraction; adaptive Canny operator; automatic clustering; edge reconstruction