Body drafting visual method based on surface sample-taking

Abstract

The invention relates to a volume rendering visualization method based on the sampling. Firstly convert the volume data into 3D texture memory; then design a bounding box containing all the volume data with the rectangular coordinate system origin as the center, set the initial corresponding relation of 8 vertex coordinates and color values to have the bounding box rotating around the center and calculate the new coordinates of the bounding box after rotating by the self-defined rotation matrix; after point coordinates inverse rotation and linear transformation to the intersection points of the cutting plane perpendicular to the line of sight and the edges of the bounding box to get the corresponding color values, color convex polygon sampling plane can be obtained through GPU trilinear interpolation calculation; with the color value of each point of the sampling plane as the coordinate, the 3D texture volume data can be sampled to perform the color composition calculation; change the step value to have the cutting plane advancing along the light of sight until the cutting plane does not intersect with the bounding box and draw the final image. The method calculates large amounts of sampling coordinates point of the polygon sampling plane at one time, thus improving the program parallelism, reducing the workload and improving volume rendering speed remarkably.

Description

(1) Technical field [0001] The invention relates to the technical field of image processing, in particular to a surface sampling-based volume rendering visualization method in a graphics processing unit (GPU). (2) Background technology [0002] Since the 1980s, with the rapid development of imaging technology, especially the gradual maturity of medical imaging technology, a large amount of volume data has emerged. How to effectively use these data is a difficult problem for researchers. Most of the volume data needs to be processed by volume rendering (Volume Rendering) visualization method, reconstructing the three-dimensional shape with two-dimensional image sequence, presenting the internal information of the object in the three-dimensional volume data in different two-dimensional images, providing users with real The intuitive three-dimensional graphics are convenient for users to observe and analyze from multiple angles and levels. Volume rendering is widely used in me...

AI Technical Summary

Problems solved by technology

[0008] Therefore, the efficiency of the current GPU-based ray-casting algorithm for volume rendering is still low, time-consuming, and the speed of the GPU hardware is not fully utilized, and it is still difficult to meet the requirements of real-time response and real-time interaction for volume rendering.

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