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Your opencv code is okay, but it would be faster and more effective to do
Mat img = imread("img.jpg", CV_LOAD_IMAGE_GRAYSCALE); Mat imgFloat; img.convertTo(imgFloat, CV_32F, 1.0/255.0);
Then you check that it's continuous by using imgFloat.isContinuous() (it should be) and then get a pointer to the data by doing imgFloat.ptr<float>(). If it's not continuous, you can just keep doing what you are. It's just faster this way and you don't have to worry about the loops yourself.
Lastly, remember that OpenCV is Row Major. I couldn't find if VLFeat is Row or Column major.
