Find indices of the lowest neighbour in matrix

Question

Morten Jørgensen 2020-1-29

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回答： Vinai Datta Thatiparthi 2020-2-3

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)])
 
 

Can anyone help me with this?

thanks

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Answer 1

Vinai Datta Thatiparthi 2020-2-3

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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)));