MATLAB: Connected points

connected pointdigital image processing

Hi, I need to know if there is any way to find the indices of connected points. To be more specific, is there any way that to preserve those indices so that it could be used for comparison in an altered matrix( the matrix comes from a picture). Thanks for the help.

Best Answer

regionprops() can return the indices of the points for each region.

Or more simply,

find(a==2)

Related Solutions

MATLAB: Finding region

so in http://www.mathworks.com/matlabcentral/answers/10396-finding-interior-or-exterior-points

BW2 = bwmorph(I,'diag');
L = bwlabel(~BW2);
Id1 = bwdist(I,'chessboard') == 1;
for i1 = 1:max(L(:))
    L(bwdist(L == i1,'chessboard')==1 & Id1) = i1;
end
idx1 = find(max(L(1,:))==L);
idx2 = find(max(L(end,:))==L);

EDIT as at Sean

L = bwlabel(~I,4);
idx1 = find(max(L(1,:))==L);
idx2 = find(max(L(end,:))==L);

MATLAB: Error using vertcat: dimension of arrays being concenated are not consistent

The error is simple. At least one of the rows of your A does not have the same number of elements as the others.

Certainly,

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 -1 1 1 1; 
x(13) -x(15) 0 x(17) x(19) -x(20) (x(21)-x(23)) 0 0 0 0 0 x(1) 0 x(2) 0 x(4) 0 x(5) -x(6)
x(7) 0 -x(7) 0 0 0 0;

is clearly wrong since that last row has only 7 elements. Note that newlines in a matrix construction are equivalent to semicolons.

Best Answer

Related Solutions

MATLAB: Finding region

MATLAB: Error using vertcat: dimension of arrays being concenated are not consistent

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