An error occurred using: coder.internal.errorIf The values ​​of TEMPLATE cannot all be equal.

global str2num;

global med_u_sub;

global med_v_sub;

global x_min;

global x_max;

global y_min;

global y_max;

a= str2num{1,1};

b= str2num{1,2};

imagea = imread(a);

imageb = imread(b);

interrogationarea = app.windowsizeEditField.Value;

xmin = x_min + interrogationarea/2+1; % 33

xmax = x_max - (interrogationarea/2+1); % 3840-(64/2+1)=3807 . (732)

ymin = y_min + interrogationarea/2+1 ; %33

ymax = y_max - (interrogationarea/2+1); % 2160-(64/2+1)=2127 . (991)

imagea=padarray(imagea,[ceil(interrogationarea/2) ceil(interrogationarea/2)], min(min(imagea)));

imageb=padarray(imageb,[ceil(interrogationarea/2) ceil(interrogationarea/2)], min(min(imageb)));

clear u v

jj=0;

ii=0;

step = 0.5*interrogationarea;

if (rem(interrogationarea,2) == 0) %for the subpixel displacement measurement

SubPixOffset=1;

else

SubPixOffset=0.5;

end

for J=xmin:step:xmax

jj=1+jj;

ii=1;

for I=ymin:step:ymax

ii=1+ii;

test_ima=imagea(J:J+interrogationarea-1, I:I+interrogationarea-1);

test_imb=imageb(ceil(J-0.5*interrogationarea):ceil(J+1.5*interrogationarea-1), ceil(I-interrogationarea/2):ceil(I+1.5*interrogationarea-1));

test_ima=test_ima-mean(mean(test_ima)); %64*64->1*64->1*1

test_imb=test_imb-mean(mean(test_imb));

correlation = normxcorr2(test_ima,test_imb);

%An error occurred using: coder.internal.errorIf The values ​​of TEMPLATE cannot all be equal.

%I don't understand this part

[ypeak xpeak] = find(correlation==max(correlation(:)));

centerx = ceil(size(correlation,1)/2);

centery = ceil(size(correlation,2)/2);

u(jj,ii)= max(xpeak) - centerx-SubPixOffset;

v(jj,ii)= max(ypeak) - centery-SubPixOffset;

[vector] = SUBPIX2DGAUSS(correlation, interrogationarea, xpeak, ypeak, SubPixOffset);

u_sub(jj,ii)= sqrt(vector(1)*conj(vector(1))) - centerx;

v_sub(jj,ii)= sqrt(vector(2)*conj(vector(2))) - centery;

end

end

Answer 1

[Shivam]

Hi KiBaek,

It is my understanding that you are getting an error while using the function 'normxcorr2', which is used to compute the normalized cross-correlation of two matrices.

As per the documentation for 'normxcorr2', you can compute the normalized cross-correlation of the matrices' template' and 'A' as:

C = normxcorr2(template, A);

where the values of 'template' cannot all be equal. You can check the 'test_ima' matrix for the error.

You can refer to the following documentation to know more about the error and the use of the 'normxcorr2' function: https://www.mathworks.com/help/releases/R2023a/images/ref/normxcorr2.html

I hope this helps in resolving the error.