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Your images have CV_8UC1 type. Even if you declare bw_image as CV_32FC1 it will have CV_8UC1 type, because image has CV_8UC3 type and cvtColor doesn't change depth. Thus cvtColor recreate bw_image with CV_8UC1 type. You mast use unsigned char in your kernel instead of float or explisitly convert d_image to CV_32FC type by convertTo method.
