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Volume rendering method for highlighting target area in volume data

A target area, highlighting technology, applied in image data processing, 3D image processing, instruments, etc., can solve the problem of not being able to have interactive mode at the same time

Active Publication Date: 2014-11-26
TSINGHUA UNIV
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Problems solved by technology

[0007] The above methods have their own unique advantages, but they cannot have the characteristics of simple interaction mode, powerful feature discrimination ability and multiple data application range at the same time.

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  • Volume rendering method for highlighting target area in volume data
  • Volume rendering method for highlighting target area in volume data

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Embodiment Construction

[0048] The volume rendering method for highlighting the target area in the volume data proposed by the present invention, its flow chart is as follows figure 1 shown, including the following steps:

[0049] (1) Calculate the gradient features, curvature features, fractal features, smoothness, line features and three-dimensional invariant moments of the volume data respectively. The specific process is as follows:

[0050] (1-1) Let the gradient feature of any voxel in the volume data be G, G=|g|, G is the modulus of g, g is the gradient vector of the voxel in the volume data, f is the function mapping of the grayscale feature of the volume data in the three directions of x, y, and z, and the grayscale feature is the numerical feature of the voxel. for , the gradient feature of the volume data is a three-dimensional matrix obtained by arranging the gradient features of all voxels in the volume data according to the position of the voxels in the volume data;

[0051] (1-2)...

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Abstract

The invention relates to a volume rendering method for highlighting the target area in volume data, and belongs to the technical field of scientific visualization direct volume rendering in computer graphics. The method includes the steps that firstly, multiple characteristics of original data are calculated, characteristic data are estimated, and proper characteristics are selected to form a transmission function; two-dimensional histogram images are segmented according to a normalization segmentation method, and the target data are separated; if the target data are not finely separated, proper characteristics continue to be selected to further separate a current result, and then the fine separation result is acquired step by step; then, the final transmission function is synthesized through the separation result; finally, the target area is highlighted through the transmission function in the volume rendering process, and an ideal visualization effect is acquired. By the adoption of the method, characteristic distinguishing capacity of the transmission function is enhanced, an interaction mode based on two-dimensional histogram image segmentation and hierarchical clustering is utilized, and operation is convenient and quick. The method is suitable for various data.

Description

technical field [0001] The invention relates to a volume rendering method for highlighting a target area in volume data, and belongs to the technical field of scientific visualization direct volume rendering in computer graphics. Background technique [0002] Direct volume rendering method is an effective means to explore the overall information and internal structure of 3D images. The direct volume rendering method sets different colors and opacities for different voxels through the transfer function, and then uses the optical integral model to sample the volume data to obtain the rendering results. The design of the transfer function is the key to determine the quality of the volume rendering results. Through the transfer function, the user can separate the region of interest from the raw volume data and highlight it. According to the feature dimension used, several types of transfer functions and corresponding problems are as follows: [0003] (1) The one-dimensional t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T15/08G06T7/00
Inventor 陈莉孙思远
Owner TSINGHUA UNIV
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