MATLAB: How to create a chessboard of variable size from images of individual tiles

arraychessboardimageImage Processing Toolboxmatrix

I need to create a chessboard using MATLAB, by using given images of tiles. The main problem, of course, is that the dimensions of the board must be configurable by the user (though it must still be a square). I've tried:
1. Storing the images in a cell array (don't know how to display this). 2. Automating the concatenation of row vectors/cell arrays into a matrix via loops (can't store images in a vector; using a cell array in place of the vector turns the matrix into a cell array).
tile{6} = imread('tw.png','png');
tile{5} = imread('twpw.png','png');
tile{4} = imread('twpb.png','png');
tile{3} = imread('tb.png','png');
tile{2} = imread('tbpw.png','png');
tile{1} = imread('tbpb.png','png');
rc=input('Enter number of rows: ');
board=cell(rc);
for k=1:rc
for l=1:rc
if (mod(k,2)&&mod(l,2))||((mod(k,2)==0)&&(mod(l,2)==0))
if (k==1)||(k==2)
board{k,l}=tile{1};
elseif (k==(rc-1))||(k==rc)
board{k,l}=tile{2};
else
board{k,l}=tile{3};
end
else
if (k==1)||(k==2)
board{k,l}=tile{4};
elseif (k==(rc-1))||(k==rc)
board{k,l}=tile{5};
else
board{k,l}=tile{6};
end
end
end
end
image(board)
And of course, using image on that gives "Numeric or logical matrix required for image CData" . The expected result would be a chessboard with a black tile in the top left corner, two rows of white pawns at the top and two rows of black pawns at the bottom.
I'm pretty much new to using MATLAB, so perhaps there was a function I missed…?

Best Answer

  • Okay, I only mentioned this code in passing in the question, but I had written a loop that constructed a one-row cell array in the order required and concatenated it onto a pre-allocated matrix. Of course, this resulted in the matrix itself becoming a cell array.
    I managed to avoid this change by concatenating the contents of the one-row cell array onto the matrix. Essentially:
    board=[board;row{1,:}];
    instead of
    board=[board;row];
    where board is a matrix and row is a one-row cell array.
    With this, the function image can be used to create a figure from the matrix board.