Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for constructing transfer function of opacity

A technology of transfer function and construction method, applied in image data processing, 3D image processing, computerized tomography scanner, etc., can solve problems such as inability to process three-dimensional volume data, inability to classify with multiple substances, etc.

Inactive Publication Date: 2007-07-25
HARBIN ENG UNIV
View PDF0 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional KSW entropy (Kapur J N, Sahoo P K, Wong AKC. A new method for gray-level picture thresholding using the entropy of the histogram. Computer Vision, Graphics, and Image Processing, 1985, 29(3): 273~285P) and The global entropy algorithm (N.R.Pal.IEEE.SMC-21, No.5, 1991.) is a single-threshold segmentation of two-dimensional images, which cannot handle three-dimensional volume data, and cannot be used for classification of various substances

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for constructing transfer function of opacity
  • Method for constructing transfer function of opacity
  • Method for constructing transfer function of opacity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0060] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0061] The method of the invention is as follows: performing CT scanning on the test piece to obtain a two-dimensional CT image sequence, and obtaining volume data from the two-dimensional CT image sequence. The opacity transfer function is determined, the volume data histogram is established and the histogram is segmented, and a threshold value is obtained in each segment as the segmentation point of the opacity transfer function. Determine the part to be displayed in the object and assign the opacity value to each voxel according to the opacity transfer function, and display the interesting part in the object by using the miscutting-deformation algorithm.

[0062] 1. Construction of opacity transfer function

[0063] In order to flexibly display any interesting part of the object, the opacity transfer function is usually a piecewise function....

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A method for structuring transfer function of opacity includes carrying out CT scanning on test-piece to obtain 2-D CT image series, obtaining volume data from said image series, setting up histogram of volume data and sectioning said histogram, obtaining a threshold from each section and using said threshold as sectioning point of opacity transfer function to conform transfer function of opacity.

Description

(1) Technical field [0001] The invention relates to the field of material classification, in particular to the field of construction of opacity transfer functions. (2) Background technology [0002] In the process of voxel imaging, in order to correctly represent the distribution of coexisting multiple substances in different colors in the final visualized image, it is necessary to classify the volume data and find out the corresponding relationship between the data and different substances . The classification of substances is realized through the opacity transfer function, which is specifically reflected in the need to specify an opacity value for each voxel in the data set to be displayed, which indicates the degree of transparency of the object, and its value is between 0.0 and 1.0. Assigning opacity to a voxel is a very complex operation, which is implemented through the opacity transfer function. Based on the classification results of the volume data, the points in a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G06T15/00G01N23/04A61B6/03G06T15/50
Inventor 李金周璐璐丛望尹明张敬南张立伟唐广栾宽郭卓维郭良
Owner HARBIN ENG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com