| 摘要 |
<p>Abstract THREE DIMENSIONAL ESTIMATION USING TWO DIMENSIONAL SURFACE CALIBRATION A method (1200) of determining a distance (710) of a pointer (150) from a light source (120), the 5 pointer being located above a surface (140) and illuminated from one side by the light source, the method comprising: determining (1120) an initial distance of the pointer from the light source and a physical position (1140) of the pointer above the surface, the initial distance being determined according to an intensity (540) of the pointer in an image (400) captured by a camera (110) and the physical position being determined from an image position (560) of the pointer in the image; 0 estimating (840) a reflective contribution to the intensity of the pointer in the image; determining (1260) the distance of the pointer from the light source according to the initial distance and the estimated reflective contribution; and storing the determined distance of the pointer from the light source. P073413/7592344_4 C) C) r~a-N C I) s "rN P07343 752366</p> |
