Find indices of the lowest neighbour in matrix

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

Answer 1

[Vinai Datta Thatiparthi]

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!