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. Author manuscript; available in PMC: 2011 Jan 1.
Published in final edited form as: J Vis. 2010 Sep 1;10(11):8. doi: 10.1167/10.11.8

Figure 6.

Figure 6

HDR image calibration and contrast measurement locations. This example shows the Step Up target with the Black Background and Overhead lighting. The calibration pattern, comprised of nine painted squares, is shown on the wall. Red dots indicate the Minolta CS100 Chroma Meter measurement points for calibration of the HDR images. Pairs of green dots show where HDR luminance samples were obtained for estimating Michelson contrast values. Five contrast measurements were taken along the bounding contour of each target for each background and lighting condition as follows: the target panel front edge and the nearby sidewalk (or step riser for Step Up, Front), the back edge and the far wall (Back), the right edge and the wall (Right), the left edge and the far wall (Upper Left), and the left edge and the floor (Lower Left).