No rectified image output

Hello, I am trying to generate a pointcloud from the depth camera of the robot pepper in conjunction with naoqi_driver, but I seem to get no output from the rectified image. When calling rostopic list I see both topics, /naoqi_driver_node/camera/depth/image_raw and /naoqi_driver_node/camera/depth/image_rect but when using rostopic hz, only image_raw has an actual output, and I can't figure out why. This is the code with which I'm trying to rectify the raw image data; Does anyone have an idea what I could be doing wrong? I'll happily provide further information if needed, I'm just not sure what else could affect this problem right now. Thanks for any help in advance.