Zhuge Bin, Feng Huan-qing, Zhou He-qin, Zhang Sheng-jian, Wu Duan
Space Med Med Eng (Beijing). 2002 Aug;15(4):296-9.
Objective. To design a 3D surface reconstruction algorithm capable of reconstructing 3D shapes of the organs, bones and tissues rapidly from CT or MR image on a personal computer. Method. By transforming and decomposing the projection of the discrete 3D data field into shear transformation and warp transformation, a Shear-Warp algorithm realizing the 3D reconstruction was established. The algorithm reduce the amount of computation obviously. The 3D surface was reconstructed by using the principle of the parallel projection, basing on the Shear-Warp algorithm. Shear transformation was performed on the volume data at first. Then the warped 3D surface was obtained by making a threshold in the sheared space. The brightness of the 3D surface was calculated using Phong brightness model, and the final image was generated through the Warp transformation. Result. A direct 3D surface reconstruction algorithm was established basing on a principle of projection from the Shear-Warp algorithm, which was able to display 3D surface on a personal computer rapidly. Conclusion. Compared with other surface reconstruction algorithms, the proposed algorithm has the advantages of no preprocessing, no intermediate data are generated in the reconstruction. With this new algorithm, it is possible to realize fast 3D surface rendering for medical images on a personal computer without the support of any hardware accelerator.
目的。设计一种三维表面重建算法，能够在个人计算机上从CT或MR图像快速重建器官、骨骼和组织的三维形状。方法。通过将离散三维数据场的投影变换并分解为剪切变换和扭曲变换，建立了一种实现三维重建的剪切-扭曲算法。该算法显著减少了计算量。基于剪切-扭曲算法，利用平行投影原理重建三维表面。首先对体数据进行剪切变换。然后在剪切空间中进行阈值处理，得到扭曲的三维表面。使用Phong光照模型计算三维表面的亮度，并通过扭曲变换生成最终图像。结果。基于剪切-扭曲算法的投影原理建立了一种直接三维表面重建算法，该算法能够在个人计算机上快速显示三维表面。结论。与其他表面重建算法相比，该算法具有无需预处理、重建过程中不产生中间数据的优点。使用这种新算法，在没有任何硬件加速器支持的情况下，也能够在个人计算机上实现医学图像的快速三维表面渲染。
