Optical center calibration
AssigneeGoPro, Inc.
InventorsMarc Lebrun, Karl Krissian, Vincent Riauté, Giuseppe Moschetti
Life of this patent
Estimating the term…
Abstract
Optical center calibration may include obtaining one or more parameters for optical center calibration, obtaining an input image captured by an image capture device using a lens, and determining a calibration circle using the parameters and the input image. Determining the calibration circle may include extracting rays using the input image, estimating contours using the input image and the rays, and estimating the calibration circle using the input image and the contours. The calibration may be iteratively improved by repeating calibration based on the input image and a previous iteration of optical center calibration.
Claims20
A method for optical center calibration comprising:
- obtaining one or more parameters for optical center calibration;
- obtaining an input image captured by an image capture device using a lens;
- and
- determining a calibration circle using the parameters and the input image, wherein determining the calibration circle includes:
- extracting rays using the input image;
- obtaining contours using the input image and the rays;
- and
- obtaining the calibration circle using the input image and the contours.
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.
Dependencies are inferred from the claim text.