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Better is to use :

Size  ksize = new Size(5, 5);
MorphKernel = Imgproc.getStructuringElement(Imgproc.MORPH_CROSS, ksize);
Imgproc.morphologyEx(Rgb, Rgb, Imgproc.MORPH_RECT, MorphKernel);

Better is to use :

Size  ksize = new Size(5, 5);
Mat MorphKernel = Imgproc.getStructuringElement(Imgproc.MORPH_CROSS, ksize);
Imgproc.morphologyEx(Rgb, Rgb, Imgproc.MORPH_RECT, MorphKernel);