Download Shareware and Freeware Software for Windows, Linux, Macintosh, PDA

line Home  |  About Us  |  Link To Us  |  FAQ  |  Contact

Serving Software Downloads in 976 Categories, Downloaded 30.132.774 Times

CTrecon-an improved parallel data image reconstruct function 1.0

  Date Added: June 11, 2013  |  Visits: 198

CTrecon-an improved parallel data image reconstruct function

Report Broken Link
Printer Friendly Version


Product Homepage
Download (18 downloads)

Reconstruct an image from parallel projection data using the convolution-backprojection algorithmfunction [img,H] = CTrecon(prj,varargin)for a discussion of this function including examples see: http://aprendtech.com/wordpress/?p=74Mathworks has created a workaround to fix the offset problem in iradon for R2010 and later users:http://www.mathworks.com/support/bugreports/744762CTrecon will work with earlier versions and also has the other features described here.Has the following improvements over iradon:1. Fixes a bug in iradon that results in offsets from the true values in the reconstructed image. Does this by computing the filter transfer function as transform of direct space function instead of transforming a ramp in frequency.See Ch. 3 of "Principles of Computerized Tomographic Imaging" byA. C. Kak and Malcolm Slaney, IEEE Press, 1988.available online at http://www.slaney.org/pct/pct-toc.html2. Uses mex functions based on iradon_speedy to back project so it is faster3. handles complex projections to return a complex reconstructed image - see zBackproject.c4. regularizes the interface to ('parameter_name', parameter_value) syntaxinputs: prj: (required) the projection data matrix of size (number of lines)X(number_of_angles) angles: optional = angles are equally spaced from 0 to 180 degrees but do not wrap around number of angles is size(prj,2) interpolation: optional = 'linear', a string specifying the interpolation in the backprojection 'linear' - linear interpolation (default) 'nearest neighbor' - nearest neighbor interpolation filter_type:(optional = 'Ram-Lak') a string that specifies the filter used. Possibilities are 'Ram-Lak' The cropped Ramachandran-Lakshimrayanan or ramp filter_type (default). 'Shepp-Logan' The Shepp-Logan filter_type: a ramp times a sinc 'Cosine' a ramp times cosine from 0 to the Nyquist frequency. 'Hamming' a ramp times the Hamming filter_type. 'Hann' a ramp times the Hann filter_type. freq_cutoff: (optional = 1) sets the filter to 0 starting at freq_cutoff*freq_nyquistoutputs: img: the reconstructed image H: the transfer function of the filter The image output size is determined from the length of the projections: OUTPUT_SIZE = 2*floor(size(prj,1)/(2*sqrt(2))) Example: see http://aprendtech.com/wordpress/?p=74 for other examples ------- P = phantom(128); R = radon(P,0:179); img = CTrecon(R,'filter_type','cosine','freq_cutoff',0.9); figure, imshow(img,[-.05 .3])

Requirements: No special requirements
Platforms: Matlab
Keyword: Backprojection Filter Typeoptional Interpolation Linear Neighbor Sizeprj String
Users rating: 0/10

License: Shareware Size: 225.28 KB
CTRECON-AN IMPROVED PARALLEL DATA IMAGE RECONSTRUCT FUNCTION RELATED
Development Tools  -  Simple Zero Phase Distortion Multiplier-less Gaussian Low-Pass & High-Pass Filter of a Linear Chirp 1.0
Simple Zero Phase Distortion Multiplier-less Gaussian Low-Pass & High-Pass Digital Filter of a Linear Chirp.
10 KB  
Scientific and Engineering  -  Matlab code for the Kalman filter 1.0
It will compute the Kalman gain and the stationary covariance matrix using a Kalman filter with a linear forward looking model. Requirements: - MATLAB 7 or higher
 
Programming  -  NA_WorkSheet 6.29
The NA_WorkSheet is a collective aggregation of algorithms coded in Java that implements various Numerical Analysis solutions/techniques in one easy to use open source tool. The application may be used for graphing, root finding, differentiation,...
890.88 KB  
MP3 Tools  -  SRS1 Cubic Spline for Excel 2.51
This is free software that adds several spline and linear interpolation functions to Microsoft Excel. It is simple to use because the new functions work just like all other existing Excel functions. Spline functions include cubic spline, bessel...
1.39 MB  
Miscellaneous  -  Matlab code of the Kalman filter Script 1.1
It will compute the Kalman gain and the stationary covariance matrix using a Kalman filter with a linear forward looking model.
10 KB  
Development Tools  -  Learning the Kalman Filter: A Feedback Perspective 1.0
The Kalman filter is a feedback system. A Simulink model is developed to view this more clearly. From the feedback blocks, it is clear the normal Kalman filter is a linear time-variant system. By replacing the time-varying filter gain with its...
10 KB  
Development Tools  -  Increase Image Resolution 1.0
IIR Increases the resolution of an image by interpolationB= IIR(inputfile,f) returns the image stored in file 'inputfile' with resolution increased by factor f in both dimensions. 'filename' must be a valid graphic file (jpg, gif, tiff, etc.). It...
10 KB  
Development Tools  -  Kalman Filter in Matlab (Tutorial) 1.0
1. Detailed Tutorial on Kalman Filtering Techniques in Matlab2.Computes the Kalman gain and the stationary covariance matrix using the Kalman filter of a linear forward looking model.
10 KB  
Science  -  Rt-Plot 2.00
Rt-Plot is a tool to generate Cartesian X/Y-plots from scientific data. You can enter and calculate tabular data. View the changing graphs, including linear and non linear regression, interpolation, differentiation and integration, during...
5.56 MB  
Communication  -  Pitch Determination Algorithm 1.0
Pitch determination and voice quality analysis using subharmonic-to-harmonic ratio.There are also some post-processing routines available, such as de-step filter, median filter, and linear filter. For more information, please see...
10 KB  
NEW DOWNLOADS IN SCRIPTS, DEVELOPMENT TOOLS
Scripts  -  Freelancer Script 5.05
Main Features: 100% Secured. Email Support (3 Years). FREE Updates (3 Years). Post projects. Featured projects. Private projects. Sealed projects. Edit/delete projects. Select freelancers....
5.49 MB  
Scripts  -  B2B Script 4.20
Main Features: 100% Secured. Email Support (3 Years). FREE Updates (3 Years). Sign-up Account (Registration of account). Lead generation tools (for the sellers). Email verification to...
5.49 MB  
Scripts  -  B2C Script 5.06
Main Features: 100% Secured. Email Support (3 Years). FREE Updates (3 Years). The script comes with totally editable site colors, icons and graphics Multilevel categories allows extensive browsing Admin can change Category ordering or...
5.49 MB  
Scripts  -  Social Networking Script 2.86
Main Features: 100% Secured. Email Support (3 Years). FREE Updates (3 Years). Registration with name, email, password, date of birth etc. User can add multiple school, college, university with start...
5.49 MB  
Scripts  -  Business Networking Script 8.04
Main Features: 100% Secured. Email Support (3 Years). FREE Updates (3 Years). Ajax based interface. Profile creation. Different types of profile. Profile for jobseekers, employers and employed...
5.49 MB  
Development Tools  -  VMP Viewer 1.0
This is a very rudimentary tool to visualize the VMP files generated by BrainVoyager. Useful to share files with people who do not have BV.
10 KB  
Development Tools  -  Sending reports and timestamped file by emailing 1.0
main executing reference usage:[1] usage_send_mail.mIllustrates email sending with multiple separate files or single timestamped tar file. Attachment failure is properly handled, with continuation of report emailing without the attachment.[2]...
768 KB  
Development Tools  -  IrisMVC 2.0 rc1
IrisMVC is an OOP PHP framework that developers can use as a strong and secure foundation to build on various web applications following the Model-View-Controller (MVC) pattern. It provides the basic functionality developers need, without...
51.2 KB  
Development Tools  -  7-Zip for Script 4.42
7-Zip is a file archiver with a high compression ratio.Features:- High compression ratio in new 7z format with LZMA compression- Supported formats:- Packing / unpacking: 7z, ZIP, GZIP, BZIP2 and TAR- Unpacking only: RAR, CAB, ISO, ARJ, LZH, CHM,...
624.64 KB  
Development Tools  -  Barnardextest 1.0
This file, as the Fisher's exact test, performs the exact probability test for a table of frequency data cross-classified according to two categorical variables, each of which has two levels or subcategories (2x2). It is a non-parametric...
10 KB