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have a look at the docs , you're setting alpha to 0, no wonder, it's all black.

(i guess, you only swapped alpha and beta params here) . instead try:

normalize(kernelXY, kernelXY, 255,0); // it probably needs a much smaller alpha factor

have a look at the docs , you're setting alpha to 0, no wonder, it's all black.

(i guess, you only swapped alpha and beta params here) . instead try:

normalize(kernelXY, kernelXY, 255,0); // 255,0);

it probably needs a much smaller alpha factor factor, 16 looks perfect to me.

have a look at the docs , you're setting alpha to 0, no wonder, it's all black.

(i guess, you only swapped alpha and beta params here) . instead try:

normalize(kernelXY, kernelXY, 255,0);

it probably even needs a much smaller alpha factor, 16 looks perfect to me.

have a look at the docs , you're setting alpha to 0, no wonder, it's all black.

(i guess, you only swapped alpha and beta params here) . instead try:

normalize(kernelXY, kernelXY, 255,0);

it probably even needs a much smaller alpha factor, 16 looks perfect to me.

    normalize(kernelXY, kernelXY, 1, 0,NORM_MINMAX);