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something like this:

float kdata[] = { -1, -1, -1, -1, -1,
                  -1, 2, 2, 2, -1,
                  -1, 2, 2, 2, -1,
                  -1, 2, 2, 2, -1,
                  -1, -1, -1, -1, -1};

Mat kernel(5, 5, CV_32F, kdata);

kernel /= 8;