| 摘要 |
Shading coefficient beta 1 is acquired with respect to a gradient vector G of a surface of a polyp and a direction S of a virtual ray (beta 1 =|G.S| [. is inner product]). For example, using a conversion function f using a look-up table (LUT), the shading coefficient beta 1 is converted into beta 2 (beta 2 =f (beta 1 ), beta 2<beta1 ). By using the shading coefficient beta 2 that is lessened in a simulated manner, the polyp is rendered with shading as if it were a polyp with large swelling for enhancing the shading of the edge of the polyp.
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