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image_proc/crop_decimate generates no topics

I use realsense camera, where driver comes without camera_info topic. Therefore I did calibration on my own and wrote my own node publishing camera_info. Now I want to use crop_decimate from image_proc to downsample my image from 1920x1080 to 640x480, cause I need depth and rgb image in the same resolution.

I started the driver, my camera_info node and the crop_decimate nodelet, which subscribes fine, but does not generate the output topics.

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Even if I subscribe to the topics, there are no Messages received.

Here is my launch file:

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Is crop decimate corrupted?