Find indices of the lowest neighbour in matrix

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Morten Jørgensen
Morten Jørgensen on 29 Jan 2020
I'm trying to find the indices of the lowest value of three neighbours (red in picture below) for backtracking a path in a matrix
i = 331
j = end
[x y] = min([cost(end-1,j-1) cost(end,j-1) cost(end-1,j)])
Screenshot 2020-01-29 at 11.48.50.png
Can anyone help me with this?
thanks

Answers (1)

Vinai Datta Thatiparthi
Vinai Datta Thatiparthi on 3 Feb 2020
Hello Morten,
Use a combination of find and min functions to get the output -
matVal = [ .. ]; % Enter your input matrix here
% Enter the coordinates for the value of which you want to find the least neighbour of
xCoOrd = .. ;
yCoOrd = .. ;
% Find out all the neighbours of the element that you picked
convOut = conv2(double(I==I(xCoOrd, yCoOrd)), ones(3,3), 'same');
idx = find(convOut - double(I==I(xCoOrd, yCoOrd)));
% The index of the least neighbour
leastNeighbourIdx = find(I == min(I(idx)));
Use ind2sub function on the variable leastNeighbourIdx to get the answer in subscripts.
Hope this helps!

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