Nobes, David S.Wieneke, B.Tatam, Ralph P.2011-06-032011-06-032004-02-28D.S. Nobes, B. Wieneke, R.P. Tatam "Determination David S. Nobes, Bernhard Wieneke and Ralph P. Tatam, "Determination of view vectors from image warping mapping functions", Optical Engineering 43, 407 (2004)0091-3286http://dx.doi.org/10.1117/1.1636765http://dspace.lib.cranfield.ac.uk/handle/1826/5456The measurands of several reported laser-based measurement techniques are sensitive to both the propagation direction of the laser and the viewing direction from the region of interest to the detector. For such imaging techniques, the view vector must be determined uniquely for each pixel in the detector array. The bulk view vector is often physically measured and a simple model used to determine the view vector for each pixel. This, however, has limitations where access is limited, the distances involved are small, or the optical system employed introduces errors. We describe a procedure to determine the unique view vector from a planar region to the detector (CCD camera) for each element in a 2-D array based on a reference target aligned with the planar region of interest. Determination of the view vector is based on the spatial distribution of the mapping function used to dewarp the view. No physical measurement of the view vector is required. Good agreement is achieved when the procedure is compared to a simple pin-hole camera model of the view using a computed test target. (C) 2004 Society of Photo-Optical Instrumentation Engineers.en-UKCopyright 2004 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.view angle determination image warping planar Doppler velocimetry machine vision three-component measurement camera calibrationArticle