can anyone solve the following error, that comes in the below given code lines in the code of SolveHomo, in the image mosaic.

The following error occurred converting from struct to double:

Error using double
Conversion to double from struct is not possible.

program code lines:

n = size(pts1,2);
A = zeros(2*n,9);
A(1:2:2*n,1:2) = pts1';
A(1:2:2*n,3) = 1;
A(2:2:2*n,4:5) = pts1';
A(2:2:2*n,6) = 1;

[Walter Roberson]

what is class(pts1) ?

Could you post enough so that people could reproduce the problem?

[Image Analyst]

Please post ALL the RED error message text. Don't just snip out a part of it. We want to see the line number, line of code, error message - the whole thing. Don't leave anything out. If it's in red , post it. Otherwise I don't know which of the subset of lines of code in your program that you posted is the line causing the error.

[Rochan Patel]

Sir, the red lines error I am getting is as follows....

The following error occurred converting from struct to double: Error using double Conversion to double from struct is not possible.

Error in solveHomo (line 7) A(1:2:2*n,1:2) = pts1';

Error in ransac1 (line 38) f1 = funcFindF(x(:,sampleIdx),y(:,sampleIdx));

Error in findHomography (line 11) [H corrPtIdx] = ransac1(pts1,pts2,coef,@solveHomo,@calcDist);

Error in example2 (line 45) [H, corrPtIdx] = findHomography(Ipts2',Ipts1');

The corresponding programs I am posting in next comment.

[Rochan Patel]

function H = solveHomo(pts1,pts2)

%  H is 3*3, H*[pts1(:,i);1] ~ [pts2(:,i);1], H(3,3) = 1
%  the solving method see "projective-Seitz-UWCSE.ppt"

n = size(pts1,2);

A = zeros(2*n,9);

A(1:2:2*n,1:2) = pts1';

A(1:2:2*n,3) = 1;

A(2:2:2*n,4:5) = pts1';

A(2:2:2*n,6) = 1;

x1 = pts1(1,:)';

y1 = pts1(2,:)';

x2 = pts2(1,:)';

y2 = pts2(2,:)';

A(1:2:2*n,7) = -x2.*x1;

A(2:2:2*n,7) = -y2.*x1;

A(1:2:2*n,8) = -x2.*y1;

A(2:2:2*n,8) = -y2.*y1;

A(1:2:2*n,9) = -x2;

A(2:2:2*n,9) = -y2;

[evec,~] = eig(A'*A);

H = reshape(evec(:,1),[3,3])';

H = H/H(end); % make H(3,3) = 1

end

[Walter Roberson]

We need to see the code for "example2"