Camera calibration systems, methods, and storage mediums for x-ray imaging

A system, comprising:

• at least one storage medium including a set of instructions;
• at least one processor in communication with the at least one storage medium, wherein when executing the set of instructions, the at least one processor is directed to cause the system to perform operations including:
• acquiring at least one image taken by a camera to be calibrated, wherein the at least one image includes a calibration target (510, 700, 810, 900), and the calibration target (510, 700, 810, 900) includes at least one calibration point;
• selecting any calibration point of the at least one calibration point as a target calibration point;
• determining, based on the at least one image, image coordinates of the target calibration point;
• obtaining a first position and a second position of an X-ray imaging device (110, 400), wherein when the X-ray imaging device (110, 400) is located in the first position and the second position, the target calibration point (512) is within an imaging field of view of the X-ray imaging device (110, 400), and a first line and a second line are not parallel, the first line connecting a radiation source (430, 520) and a detector (440, 530) of the X-ray imaging device (110, 400) at the first position, the second line connecting the radiation source (430, 520) and the detector (440, 530) of the X-ray imaging device (110, 400) at the second position;
• determining, based on the first position and the second position, spatial coordinates of the target calibration point;
• and
• performing calibration on the camera to be calibrated (160) based on the image coordinates and the spatial coordinates.