High dynamic range photogrammetry for synchronous luminance and geometry measurement

This study developed high dynamic range photogrammetry for synchronous acquisition of luminance of targets across a scene and their three dimensional coordinates XYZ in the field. The high dynamic range photogrammetry deploys a single digital camera. A Canon Rebel T2i fitted with four Sigma lenses was used and calibrated in a laboratory. Photogrannmetric coordinates, transformation equations, two lens radial distortion models, a 3D angular measurement tripod head mounted on a portable platform, and a measurement protocol were developed. The high dynamic range photogrammetry was validated in a laboratory experiment. The average errors of 1.8- 6.2% for luminance mapping seven grey checkers and 12.9-24.3 mm for measuring their XYZ coordinates are deemed acceptable in practice. The high dynamic range photogrammetry would supplement light and geometry measurement and stimulate many applications.