What does it mean to get your camera calibrated?
The calibration process involves taking a series of photos in a controlled way, so you can see exactly how your focus is off. You can then correct it using your camera settings. If the intended subject of your image is blurry, that means your camera is either back focusing or front focusing.
Is it necessary to calibrate a camera?
The camera calibration aims to determine the geometric parameters of the image formation process [1]. This is a crucial step in many computer vision applications especially when metric information about the scene is required.