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In the first code part: Who is J?
In the second: matimg.data is a pointer (uchar*), so you always put in temp the value linked to the first element in the Mat. You shall use something like (I did not test it):
temp2 = (matimg.data + i2 * matimg.step)[j2 * matimg.elemSize() + k2 ];
or:
temp2 = matimg.ptr(i2)[j2 + k2];
Anyway, the code does not seems to be the same...