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Picture jitter: the camera's picture jitter is generally due to fixed lens themed frame loosening, then the camera image tilt. Suggested methods:adjust the angle of the bracket, and fasten to prevent loosening again.
No image: the camera has no image because the connector is not plugged in (loose) or the system connection cable is broken, it is recommended to check whether the connector is plugged in and the system connection is disconnected.
Image blur: camera image blur, most likely the lens part accumulated a lot of dust, unclean caused by, it is recommended to clean the lens then ok.
Image tilt: image display tilt, generally because the main part of the camera has not been installed, it is recommended to adjust the camera bracket.