Java Equivalent OpenCV Code to this C++ Code

Question

Can anybody tell me the correct java code for this c++ code snippet:

output.at(x, y) = target.at(dx, dy);

I have tried this java code and they are displacing pixel but not showing image clearly :

output.put(x, y, target.get(dx, dy));

Answer 1

For one channel images e.g. grey-scale; 0 ~ 255

Getting a pixel value

double pixelValue = image.get(i,j)[0];

Setting a pixel value

image.put(i,j,230);

For 3 channel images e.g. RGB (3 values 0 ~ 255)

Getting a pixel (double[] array will have 3 values)

double[] pixelValue = image.get(i,j);

Setting a pixel with 3 RGB values

image.put(i,j,255,250,100); // yellow color