THREE-VIEW STEREO ANALYSIS FOR PLANAR WATER SURFACE MEASUREMENTS WITH PROJECTOR ILLUMINATION

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  • プロジェクターを用いた三眼視による面的水面形状計測

Abstract

<p> In this study, a new image measurement technique for water surfaces is discussed through a planar wave experiment. The measurement system is composed of one projector and two digital cameras. For this measurement system, wave tanks are filled with white-colored water with white dye. Color pattern illumination, which has many color dots as a grid pattern, is projected from the projector to the water surface, and the light scattered just below the surface is recorded by the cameras. Including the projector as a single view for stereo analysis, we have totally three-views to determine 3D surface coordinates of each color dot. For robust automatic matching of color dots, normalized color difference vecotors are introduced as dissimilarity of the color patterns in the projected and recorded images. As the color dots scattered under water surfaces are recorded in this system, their recorded locations are shifted from the ideal locations with reflction exactly at the water surface. A method to correct the recorded locations is proposed and tested through the planar wave tank experiment. Progressive waves were successfully measured with the proposing technique, and obtained horizontal distributions of water levels were comparable to those by conventional wave gauges.</p>

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