Ben Cantrick (mackys) wrote,
Ben Cantrick
mackys

Depth and reflectance map auto-capture with two photos - one with flash, one without.


First an image of a surface is captured without flash. Portions of the surface that are higher appear brighter, and portions that are deeper appear darker. The problem is that the different colors of a surface also reflect light differently, making it difficult to determine if the brightness difference is a function of depth or color. By taking a second photo with flash, however, the accurate colors of all visible portions of the surface can be captured. The two captured images essentially become a reflectance map (albedo) and a depth map (height field).

"Software then compares the brightness of every matching pair of pixels in the two images and calculates how much of a pixel's brightness is down to its position, and how much is due to its colour. That information is used to produce a realistic rendering of a surface's texture."


http://www.hothardware.com/News/Capturing-3D-Surfaces-Simply-With-a-Flash-Camera/

http://aig.cs.man.ac.uk/research/daedalus/hallucination.php

There's a video demonstrating the technique - quite impressive. This quick, cheap capture technique should drive a whole new level of realism in video games.
Tags: slashdot
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