Rank: 360 based on 180 downloads (last 30 days) and 8 files submitted
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Prakash Manandhar

E-mail
Company/University
University of Massachusetts Dartmouth
Lat/Long
41.676945, -70.95917

Personal Profile:

PhD Student, Biomedical Engineering and Biotechnology (Electrical and Computer Engineering Based).

Web: http://p-manandhar.info

Professional Interests:
signal processing, bioinformatics, biomimetics

 

Watch this Author's files

 

Files Posted by Prakash View all
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(last 30 days) 		Comments Rating
02 Feb 2012 Screenshot Bezier Curve Function Vectorized function to calculate Bezier Curve Author: Prakash Manandhar mathematics, graphics, curve generation 23 0
16 May 2011 Screenshot Simple demo program for color based tracking Simple script to read a video file and track a single red marker in 2D using hue and saturation. Author: Prakash Manandhar image processing, color based tracking 39 1
07 Oct 2009 Screenshot Interpolation for missing data Interpolates using nearest neighbor, bilinear or bicubic formula for missing data points Author: Prakash Manandhar 2d, image processing, nonuniform grid, interpolation, nearest neighbor, missing data 22 1
  • 5.0
5.0 | 1 rating
15 Dec 2008 Screenshot Circular Hough Trasform in Polar Domain Detects center (xc, yc) and radius R of circle in an image in the polar domain. Author: Prakash Manandhar image processing, hough transform, circle detection, pattern recognition 17 0
04 Dec 2008 Screenshot Conditional Density Propagation Tracker (1 Dimenstional) Tracks parameter in clutter using Isard and Blake (1998)'s ConDensation Algorithm. Author: Prakash Manandhar particle filter, tracking, statistics, medical, signal processing, image processing 14 0
Comments and Ratings by Prakash View all
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  • 6
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03 Feb 2012 Bezier Curve Plotter constructs a Bezier curve using a given set of control points Author: Sagar Aiya

Great, but code could be vectorized with huge improvment for data with large number of sampling points. I have posted the vectorized code here:

http://www.mathworks.com/matlabcentral/fileexchange/34902
31 Jan 2012 Mesh voxelisation Voxelise a triangular-polygon mesh. Author: Adam A
02 Jul 2011 Panel Like subplot, but with easier control over the details of the layout, and WYSIWYG export to file. Author: Ben Mitch
30 Dec 2010 raytrace A function to model acoustic refraction due to variations in sound speed. Author: Val Schmidt

Thanks, this is fantastic.
10 Feb 2009 N-Dimensional BSplines Construct coefficients of interpolating or smoothing BSplines from N-dimensional array, analytically Author: Nathan Cahill

Thanks... Could it be possible to add circular and mirror boundary conditions and non-uniform nodal points?

Prakash.
Comments and Ratings on Prakash's Files View all
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15 Sep 2011 Polar To/From Rectangular Transform of Images converts rectangular image to polar and back Author: Prakash Manandhar Agrawal, Dhruv

Is it correct to use different scaling factors for different axes? A circle in an image should transpose as a rectangle in polar image, but this makes it an ellipse. Could take the min of the scaling factors (sx,sy) for both, though, you might end leaving some portion of the image.

08 Jun 2011 Simple demo program for color based tracking Simple script to read a video file and track a single red marker in 2D using hue and saturation. Author: Prakash Manandhar anju

Hi Prakash,

Would you be able to help on me on the matlab coding for the object tracking of the using Hue value ? As i am new to matlab i couldnt find much details on it .

My object is to perform color calibration in order to define the upper and lower limit of the HUE value for to detect the color at any light intensity .

28 May 2011 Interpolation for missing data Interpolates using nearest neighbor, bilinear or bicubic formula for missing data points Author: Prakash Manandhar Bosheng

great job! better if there's a readme file
18 Oct 2010 Polar To/From Rectangular Transform of Images converts rectangular image to polar and back Author: Prakash Manandhar Villafañe, Fernando

For what serving the matrix (A) and how is obtained?.

function v = interpolate (imR, xR, yR)
    xf = floor(xR);
    xc = ceil(xR);
    yf = floor(yR);
    yc = ceil(yR);
    if xf == xc & yc == yf
        v = imR (xc, yc);
    elseif xf == xc
        v = imR (xf, yf) + (yR - yf)*(imR (xf, yc) - imR (xf, yf));
    elseif yf == yc
        v = imR (xf, yf) + (xR - xf)*(imR (xc, yf) - imR (xf, yf));
    else
       A = [ xf yf xf*yf 1
             xf yc xf*yc 1
             xc yf xc*yf 1
             xc yc xc*yc 1 ];
       r = [ imR(xf, yf)
             imR(xf, yc)
             imR(xc, yf)
             imR(xc, yc) ];
       a = A\double(r);
       w = [xR yR xR*yR 1];
       v = w*a;
    end
22 Mar 2010 Polar To/From Rectangular Transform of Images converts rectangular image to polar and back Author: Prakash Manandhar Attie, Raphael

im2polar : this update will save you 1 order of magnitude of processing time, by vectorizing the code, and using interp2 (can even do better with mex file ba_interp in file exchange) :
Watch out, this might be the transpose of the original output.

rMin=0;
rMax=1;

[Mr Nr] = size(imR); % size of rectangular image
xRc = (Mr+1)/2; % co-ordinates of the center of the image
yRc = (Nr+1)/2;
sx = (Mr-1)/2; % scale factors
sy = (Nr-1)/2;

imP = zeros(M, N);

dr = (rMax - rMin)/(M-1);
dth = 2*pi/N;

% loop in radius and
r=rMin:dr:rMin+(M-1)*dr;
th=(0:dth:(N-1)*dth)';
[r,th]=meshgrid(r,th);
x=r.*cos(th);
y=r.*sin(th);
xR = x*sx + xRc;
yR = y*sy + yRc;
imP = interp2(imR, xR, yR); %interpolate (imR, xR, yR);
Top Tags Applied by Prakash
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image processing, 2d, annotation, bayesian, bilinear bicubic
Files Tagged by Prakash View all
  • 1 - 5 of
  • 8
Updated   File Tags Downloads
(last 30 days) 		Comments Rating
02 Feb 2012 Screenshot Bezier Curve Function Vectorized function to calculate Bezier Curve Author: Prakash Manandhar mathematics, graphics, curve generation 23 0
16 May 2011 Screenshot Simple demo program for color based tracking Simple script to read a video file and track a single red marker in 2D using hue and saturation. Author: Prakash Manandhar image processing, color based tracking 39 1
07 Oct 2009 Screenshot Interpolation for missing data Interpolates using nearest neighbor, bilinear or bicubic formula for missing data points Author: Prakash Manandhar 2d, image processing, nonuniform grid, interpolation, nearest neighbor, missing data 22 1
  • 5.0
5.0 | 1 rating
15 Dec 2008 Screenshot Circular Hough Trasform in Polar Domain Detects center (xc, yc) and radius R of circle in an image in the polar domain. Author: Prakash Manandhar image processing, hough transform, circle detection, pattern recognition 17 0
04 Dec 2008 Screenshot Conditional Density Propagation Tracker (1 Dimenstional) Tracks parameter in clutter using Isard and Blake (1998)'s ConDensation Algorithm. Author: Prakash Manandhar particle filter, tracking, statistics, medical, signal processing, image processing 14 0

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