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The REP-0104 specification supports using the full resolution calibration with a cropped image.
The CameraInfo returned by camera_info_manager contains default operational parameters, including binning and ROI values. That works unmodified if your camera is publishing the full-resolution image for which it was calibrated.
To publish a cropped image, add the appropriate ROI parameters to the CameraInfo message before publishing it. You can look at the camera1394 driver for an example of this logic.
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