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Author: 纯净水 |
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Description: 目前医学图像三维体绘制主要采用以下几中方法:光线投射算法(Ray—casting)、抛雪球算法(Splatting)和错切一变形算法(Shear warp) 三维纹理.本文只着重讲解第一种方法的实现原理及部分算法
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Author: 刘刚 |
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Description: 图像处理领域，体绘制splatting算法-Image processing fields, Splatting Volume Rendering Algorithm
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Size: 9419776 |
Author: 魏继增 |
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Description: 目的 利用 CT、 MR等获得的图像 ,重构出器官、 骨骼或组织的三维形体 ,帮助医生诊断、 治疗或制订手术方案。方法hear2Warp 算法通过将三维数据场的投影分解为错切变换( shear ) 和变形变换(warp)两步来实现三维重建 ,显著减少了计算量。先对体数据进行错切变换 ,然后在错切空间根据阈值法获取三维表面 ,根据光照模型得到三维表面的亮度 ,最后通过变形变换得到最终的结果图像。-The purpose of the use of CT, MR and other available images, reconstruct organs, bone or tissue of the three-dimensional shape, helping physicians diagnose, treat, or development of surgery. Methods hear2Warp algorithm the projection of three-dimensional data field is decomposed into shear transformation (shear) and deformation of transformation (warp) two-step to achieve the three-dimensional reconstruction, significantly reducing the computational complexity. The first body of data on the shear transformation, and then in the wrong tangent space under the threshold value method to obtain three-dimensional surface, obtained under the illumination model three-dimensional surface brightness, the final adoption of a final result of deformation of the image transformation.
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Size: 301056 |
Author: liaozw |
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Description: 本文介绍的剪切图像顺序光线投射，一个新的体绘制方法。这种方法使得采样数据在图像质量相当于三个尺寸，最好的射线每像素体绘制算法（全图顺序），而在同一时间计算复杂度和保留空间相干性接近已知的最快算法（剪切变形）。在剪切图片的顺序，如剪切，弯曲，体积数据集重新取样片沿平行于其他物体的射线。不同剪切变形，但象纹理为基础的方法，射线演员通过对图像的像素的平面和样品中心点是在与每个切片射线的交点。-This paper describes shear-image order ray casting, a new method for volume rendering. This method renders sampled data in three dimensions with image quality equivalent to the best ofray-per-pixel volume rendering algorithms (full image order), while at the same time retaining computational complexity and spatial coherence near to that of the fastest known algorithm (shear-warp). In shear-image order, as in shear-warp, the volume data set is resampled along slices parallel to a face of the volume. Unlike shear-warp, but liketexture-based methods, rays are cast through the centers of pixels of the image plane and sample points are at the intersections of rays with each slice.
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