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Title: Effects of JPEG compression on the accuracy of photogrammetric point determination
Authors: Li, Z 
Yuan, X
Lam, KWK
Issue Date: 2002
Publisher: American Society for Photogrammetry and Remote Sensing
Source: Photogrammetric engineering and remote sensing, 2002, v. 68, no. 8, p. 847-853 How to cite?
Journal: Photogrammetric engineering and remote sensing 
Abstract: An empirical investigation into the effect of JPEG compression on the accuracy of photogrammetric point determination (PPD) is described. A pair of black-and-white aerial photographs of a city, taken at a scale of 1:8000, was selected and scanned at a resolution of 25 pm. Eighteen image points were measured with the ISDM module of an Intergraph digital photogrammetric workstation (DPW), and the bundle adjustment of a single model was performed using WuCAPS scps (Wuhan GPS supported bundle block adjustment software). In processing various PEG compressed images with Q-factors from 1 to 100, the accuracy of the 30 coordinates of the pass points was assessed and compared with that obtained from the original images (i.e., without compression). The empirical results show that, when the compression ratios are under 10, the compressed image is near-lossless. In other words, the visual quality of PEG compressed images is still excellent and the accuracy of manual image mensuration is essentially not influenced. However, no indication can be found from the results that a compression of 10 is the critical value or the optimum compression level for PPD. Indeed, it is clear that the degradation of accuracy in PPD is almost linear.
ISSN: 0099-1112
EISSN: 2374-8079
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