Black Image: pylon_camera

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I am using Resonon Pika L which has pylon camera(hyperspectral) and using it with Pylon ROS package. I followed the article available at "http://wiki.ros.org/pylon_camera" to setup the pylon ROS package.

After running 'rosrun pylon_camera pylon_camera_node', I run 'rosrun image_view image_view image:=/pylon_camera_node/image_raw' But I am only getting black image.

I also checked the data published to '/pylon_camera_node/image_raw' topic. It is just a matrix full of 0's. So I am not sure how to see the images from the camera. I am new to ROS. I can see some gray-line images using PylonViewerApp

Any help in this regard would be highly appreciated.