lalecarbon's profile - activity

Well, the solution has gotten here: http://stackoverflow.com/questions/24364794/convert-matlab-image-svd-method-to-opencv Thanks.

Hello dear AA9GG. you can use it. I've shown this job in my website: Opencv Good luck

Hello everyone,
I want to write a program with opencv by c++ in the visual studio. My code is following matlab code:

close all
clear all
clc

%reading and converting the image
inImage=imread('pic.jpg');
inImageD=double(inImage);

[U,S,V]=svd(inImageD);

% Using different number of singular values (diagonal of S) to compress and
% reconstruct the image
dispEr = [];
numSVals = [];
for N=5:25:300
  % store the singular values in a temporary var
  C = S;

  % discard the diagonal values not required for compression
  C(N+1:end,:)=0;
  C(:,N+1:end)=0;

  % Construct an Image using the selected singular values
   D=U*C*V';


  % display and compute error
  figure;
  buffer = sprintf('Image output using %d singular values', N)
  imshow(uint8(D));
  title(buffer);
  error=sum(sum((inImageD-D).^2));

  % store vals for display
  dispEr = [dispEr; error];
  numSVals = [numSVals; N];
end

What's your opinion to do this? I want to save image in a text file and retrieve it from file into the Mat array. I've written this part as follow:

Mat image;
FileStorage read_file("pic_file.txt", FileStorage::READ);
read_file["pic"] >> image;
read_file.release(); 
Mat P;
image.convertTo(P, CV_32FC3,1.0/255);
SVD svda(P); //or SVD::compute(P,W,U,V);

But I have problem with SVD function and it doesn't work. Is there anything to do for computing SVD compression of an image?

Thank You so much.
Vahids.

Hi everyone. I've tried to compute SVD of an image by following code:

Mat image;
Mat U, W, V;
image = imread("pic.jpg");
Mat P;
//convert to float 64 for computing 
image.convertTo(P, CV_64FC1,1.0/255);
namedWindow("Display P window", WINDOW_AUTOSIZE);
imshow("Display P window", P);   
waitKey(0);
SVD svda(P);
//or SVD::compute(P, W, U, V);

program correctly executed and image has shown, but svd didn't compute. when I traced the code, I got following message at opencv svd function:

__vfptr = opencv_core248d.dll!0x00007ffed694ce50 (load symbols for additional information) {opencv_core248d.dll!0x00007ffed6602afe, ...}

My purpose is computing svd of an image and show image by change number of eigen values. Please help me. Thank you. Vahids