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for a grayscale image this should work (works for me, I use openCV 3.0): Mat zeroMat = Mat::zeros(n_rows, n_cols, CV_8UC1); where n_rows and n_cols are the number of rows and colums (thus, int) respectively. if your image is not grayscale, change the last entry.

for a grayscale image this this should work (works for me, I use openCV 3.0): 3.0):

 Mat zeroMat = Mat::zeros(n_rows, Mat.zeros(n_rows, n_cols, CV_8UC1);
CvType.CV_8UC1);

where n_rows and n_cols are the number of rows and colums (thus, int) respectively. if your image is not grayscale, change the last entry.