Photogrammetric scale-bar measurement method based on microscopic image aiming

Xiao-chuan Gan; Ming-zhao He; Lian-fu Li; Xiao-you Ye; Jian-shuang Li

doi:10.1117/12.974264

15 October 2012 Photogrammetric scale-bar measurement method based on microscopic image aiming

Xiao-chuan Gan, Ming-zhao He, Lian-fu Li, Xiao-you Ye, Jian-shuang Li

Proceedings Volume 8417, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 84170A (2012) https://doi.org/10.1117/12.974264
Event: 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2012), 2012, Xiamen, China

Abstract

In close-range photogrammetry, a length scale of photogrammetric system was given by a scale-bar. To achieving a precision result which uncertainty is less than 10 micrometers, the uncertainty of scale-bar measurement should be less than 3 micrometers. For this purpose, an approach was proposed according to the feature of retroreflective target (RRT) on scale-bar; a measurement system consisted of a high resolution CCD camera, a laser interferometer and the lights was established. The RRTs at two ends of the scale-bar was aimed by the CCD camera. The distance between two aiming positions was measured by the laser interferometer. In this paper, a linear direct measurement model was founded; an algorithm calculating RRT's gray centroid was presented. A series of tests were carried out under different light, different illuminance and different aiming method respectively. The results indicated that the uncertainty satisfying the request of scale-bar measurement in close-range photogrammetry.

Citation Download Citation

Xiao-chuan Gan, Ming-zhao He, Lian-fu Li, Xiao-you Ye, and Jian-shuang Li "Photogrammetric scale-bar measurement method based on microscopic image aiming", Proc. SPIE 8417, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 84170A (15 October 2012); https://doi.org/10.1117/12.974264

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