Optical center calibration

An image capture apparatus comprising:

• a lens;
• an image sensor configured to capture, using the lens, an input image;
• and
• an image processor configured to:
• obtain one or more parameters for optical center calibration;
• obtain the input image;
• and
• determine a calibration circle using the parameters and the input image, wherein to determine the calibration circle, the image processor is configured to:
• extract rays using the input image;
• obtain contours using the input image and the rays;
• and
• obtain the calibration circle using the input image and the contours.

An image capture apparatus calibration system comprising:

• an image capture apparatus including:
• a lens;
• and
• an image sensor configured to capture, using the lens, an input image;
• and
• a calibration unit including:
• a processor configured to:
• obtain one or more parameters for optical center calibration;
• obtain the input image from the image capture apparatus;
• and
• determine a calibration circle using the parameters and the input image, wherein, to determine the calibration circle, the processor is configured to:
• extract rays using the input image;
• obtain contours using the input image and the rays;
• and
• obtain the calibration circle using the input image and the contours.