Finding correlation between two images

James Murphy

2014 12 17

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3 次查看（30 天）

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Can someone tell me why this program is not working..

Searching for an object in a bitmap image. The program runs without error, however, the x-mark and line plots are in completely random places on the image and not where the most correlation should be. Also, the x-mark is in a different location to the two maxRow and maxCol plots?

Cheers.

clear all; close all; clc; G1 = imread('searchSpace.bmp'); G1 = squeeze(G1(:,:,1)); G2 = imread('searchObject.bmp'); G2 = squeeze(G2(:,:,1)); G4 = G2;

M = size(G1,1); N = size(G1,2);

scaleFactor = 0.25;

while scaleFactor <= 4

    maxCorr=0;maxRow=0;maxCol=0;
    for rotateFactor = 0:90:360     
        G2 = imresize(G4, scaleFactor);    
        G2 = imrotate(G2, rotateFactor);    
        G3 = zeros(M,N);        
        maskW = size(G2,1);     
        for row=floor(maskW/2)+1:M-floor(maskW/2)         
            for col=floor(maskW/2)+1:N-floor(maskW/2)   
                G3(row,col) = corr2(G1(row-floor(maskW/2):row+floor(maskW/2), ...
                    col-floor(maskW/2):col+floor(maskW/2)),G2);     
            end       
        end           
        for row=1:size(G3,1)        
            for col=1:size(G3,2)    
                if(G3(row,col)>maxCorr) 
                    maxCorr = G3(row,col);  
                    maxRow = row;   
                    maxCol = col;   
                end                 
            end                  
        end                         
    end                            
    scaleFactor = scaleFactor + 1;  
end

imshow(G1);

hold on;

plot(maxRow, maxCol, 'cx');

hold on;

plot([0 size(G1,1)], [maxRow maxRow], 'c-');

plot([maxCol maxCol], [0 size(G1,2)], 'c-');

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Image Analyst 2014-12-20

I answered your last question (thanks for accepting it) but you edited it away - those kinds of behaviors don't really entice people to answer you anymore.

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