caa a22 4500 47709273X CHVBK 20180405111519.0 cr unu---uuuuu 170330e19961101xx s 000 0 eng 10.1007/BF01893308 doi (NATIONALLICENCE)springer-10.1007/BF01893308 Image registration for pressure-sensitive paint applications [Elektronische Daten] [J. Bell, B. McLachlan] Pressure-sensitive paint (PSP) data are generally derived by ratioing two images of a PSP-coated wind tunnel model. One image is taken at a known "wind-off” reference pressure while the other is taken at the test condition, in order to factor out the effects of nonuniform illumination and paint thickness. However, airloads on the model cause it to move during testing with respect to both the camera and the illumination source used to excite the P & P. Thus, the raw PSP images must be aligned, or registered, by means of a spatial transform. Once a proper ratioed image is obtained, image coordinates must be related to model coordinates so that pressure data can be obtained at the desired points on the model. This article compares several transforms used for image registration, and demonstrates the use of the projective equation of photogrammetry to relate model to image coordinates. An application in a small-scale wind tunnel test is shown, demonstrating mapping of pressure data to the three-dimensional model surface. Springer-Verlag, 1996 Bell J. Design Cycle Technologies Branch, NASA Ames Research Center, Mail Stop 227-2, 94035-1000, Moffett Field, CA, USA aut McLachlan B. Design Cycle Technologies Branch, NASA Ames Research Center, Mail Stop 227-2, 94035-1000, Moffett Field, CA, USA aut Experiments in Fluids Springer-Verlag 22/1(1996-11-01), 78-86 0723-4864 22:1<78 1996 22 348 https://doi.org/10.1007/BF01893308 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01893308 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bell J. Design Cycle Technologies Branch, NASA Ames Research Center, Mail Stop 227-2, 94035-1000, Moffett Field, CA, USA aut NATIONALLICENCE 700 1- McLachlan B. Design Cycle Technologies Branch, NASA Ames Research Center, Mail Stop 227-2, 94035-1000, Moffett Field, CA, USA aut NATIONALLICENCE 773 0- Experiments in Fluids Springer-Verlag 22/1(1996-11-01), 78-86 0723-4864 22:1<78 1996 22 348 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer