Depth resolution on zed_ros_wrapper

Hi, I am using zed camera with ROS and I want to use both RGB and Depth images for matching detected result.
However, no matter what parameters on zed_ros_wrapper I set, the resolution of the depth image is a tenth of the resolution of the RGB image. I understand that this is better from a computational point of view, but is it possible to change the parameters? Or do I need to write my own code to enlarge the depth image?