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usb_cam and gscam are not appropriate for what you're trying to do; they're for using webcams that you connect to your computer using USB.

I'm not aware of a ROS driver for the SJ4000. It looks like a fairly new camera, so I suspect no one has developed a ROS driver for it yet. You'll probably need to write your own driver.

A few places to start:

• Go through the ROS C++ tutorials
• Figure out how to retrieve images from your camera. Start with the basics, and work up to a C++ program which can receive raw images and display them on screen using OpenCV.
• Convert your program into a C++ ROS node which receives images and publishes them using image_transport. Start with the image_transport publisher tutorial. Once you have that working, upgrade to the image_transport::CameraPublisher.
• Read through the camera_info_manager tutorial. This library helps your driver store and publish calibration data, which will allow you to calibrate your camera later.