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A Volume Rendering Method for Pipeline CT Images

A CT image and volume rendering technology, applied in the field of CT scanning, can solve the problems of affecting the inspectors, overlapping each other, and difficult to accurately measure the pipeline structure.

Active Publication Date: 2018-12-21
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the pipeline is drawn with a ray projection volume, the front and rear pipeline walls will overlap each other and the colors will be mixed, which will affect the correct judgment of the pipeline quality by the inspectors, and at the same time bring certain difficulties to the precise measurement of the pipeline structure

Method used

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  • A Volume Rendering Method for Pipeline CT Images
  • A Volume Rendering Method for Pipeline CT Images
  • A Volume Rendering Method for Pipeline CT Images

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0044] The star-shaped ray projection can divide and unfold the pipeline, and display the defect information on the pipeline wall more intuitively. The specific implementation examples are as follows:

[0045]Select a circular steel pipeline workpiece, and use 6MeV electron linear accelerator industrial CT to perform continuous tomographic CT scanning on the pipeline. The width of the straightener is 0.4mm, and the continuous tomographic image of the pipeline is obtained after reconstruction. The reconstructed image size is 760×760, and there are 65 layers of images in total, such as Figure 4 shown. Star ray casting needs to determine the geometric parameters of the projected light. The parameters calculation and image drawing steps are as follows:

[0046] Step 1: Find the coordinates of the projected central axis:

[0047] Star raycasting requires determining the central axis of the star from which all rays are emitted. The image reconstructed by industrial CT scanning ...

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Abstract

The invention relates to a volume rendering method for pipeline CT images, and belongs to the technical field of CT scanning. The method comprises the following steps: 1) reading in CT image data of a pipeline and carrying out denoising and filtering processing on the CT image data; 2) searching a central axis of the pipeline and obtaining a three-dimensional coordinate of a discrete point of the central axis; 3) equi-distantly selecting a point on the central axis as a projection light ray starting point, and calculating the normal of a star-like plane; 4) appointing an angle interval of light rays in the star-like plane, a length of light ray projection and a step of light ray sampling; 5) carrying out color synthesis on each projection light ray by adopting a front-to-back color synthesis formula, and obtaining the color of each pixel point; 6) forming a final rendered image through the colors of the all the pixel points. The volume rendering method for pipeline CT images is particularly suitable for pipelines or workpieces with inner cavities and can be used for displaying the internal defects of the workpieces more clearly and visually, so that the further analysis and measurement are facilitated.

Description

technical field [0001] The invention belongs to the technical field of CT scanning, and relates to a method for volume rendering of a pipeline CT image. Background technique [0002] Pipeline components can be inspected for internal defects after industrial CT scanning, and the 3D CT image of the pipeline can be visualized to display a 3D rendering. Visualization methods can be divided into two categories: surface rendering and direct volume rendering; surface rendering needs to construct geometric primitives from 3D CT images and then display them; volume rendering directly converts 3D CT images into visualization effects according to certain calculation rules and displays them , no need to generate intermediate geometric primitives, so the display details are more and the effect is better. [0003] Volume rendering is generally divided into two categories: ray casting in image order (see MLevoy. Display of surfaces from volume data. IEEE Computer Graphics and Applications...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T15/08G06T7/00G06T5/00
CPCG06T5/002G06T7/0004G06T15/08G06T2207/10081G06T2207/30164
Inventor 邹永宁王珏卢艳平
Owner CHONGQING UNIV