find a table in onother table by 80%

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Konstantinos Kontos 2012-5-21

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hello everyone i have a table K2 50 X 50 that has 0 and 1 and a bigger table A 4864 X 3404.i want to find if table K2 is in table A(the elements of the table ) by a threshold of 80%.i have to search in the big table but how i scan all the 50 X 50 tables exists? thanks a lot

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Sean de Wolski 2012-5-21

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You could do this with two calls to conv2():

A=[1 0 1];
V=[1 1 1 1 1 0 0 1 1 0 1];
small_matrix = A;
big_matrix = V;
xbig = logical(big_matrix);
xsmall = logical(small_matrix);
Xmorethan80 = (conv2(double(xbig),double(xsmall),'valid')+...
  conv2(double(~xbig),double(~xsmall),'valid')) > (numel(small_matrix)*.8)

I do not get the error you are describing with the above.

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Konstantinos Kontos 2012-5-21

i see the results with the imshow but i dont know if is the correct cause i see black pixels there that o didnt expected.Furthermore if i want to see if the table exactly is on the other table, just erase the *.8?

thanks again you are really great!!

Konstantinos Kontos 2012-5-21