Drawable canvas annotation regions spill-over issue

[bhanudaybirla]

I am facing a big problem while annotating medical grade images. I am creating ROIs using drawable-canvas but the region is going little bit outside of annotated boundary for each ROI. For the illustration purpose I have taken a random image and drawn a rectangle and it can be clearly seen that the selected region is going outside of boundary. See below the rectangle boundary in yellow color in first image and selected region plotted on same image in second image.