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Ask @berak pointed out:

mask_normalBayes.at<uchar>(i,j) = labels_normalBayes.at<int>(0,0);
mask_SVM.at<uchar>(i,j) = labels_SVM.at<float>(0,0);

By changing the cast to an IF test we can test the labels of all 3 classifiers:

mask.at<uchar>(r, c) = (uchar)label.at<float>(0, 0); // CV_32F results

Change it to:

if((uchar)label.at<float>(0, 0)) {
    mask.at<uchar>(r, c) = 1;
}

Now it works!

Ask @berak pointed out:out and thanks to @StevenPuttemans to put me on the right track:

mask_normalBayes.at<uchar>(i,j) = labels_normalBayes.at<int>(0,0);
mask_SVM.at<uchar>(i,j) = labels_SVM.at<float>(0,0);

By changing the cast to an IF test we can test the labels of all 3 classifiers:

mask.at<uchar>(r, c) = (uchar)label.at<float>(0, 0); // CV_32F results

Change it to:

if((uchar)label.at<float>(0, 0)) {
    mask.at<uchar>(r, c) = 1;
}

Now it works!