Invention Grant
- Patent Title: Lens shading calibration for cameras
- Patent Title (中): 相机镜头阴影校准
-
Application No.: US13732211Application Date: 2012-12-31
-
Publication No.: US09451187B2Publication Date: 2016-09-20
- Inventor: Noy Cohen , Ricardo J. Motta
- Applicant: NVIDIA Corporation
- Applicant Address: US CA Santa Clara
- Assignee: NVIDIA CORPORATION
- Current Assignee: NVIDIA CORPORATION
- Current Assignee Address: US CA Santa Clara
- Main IPC: H04N5/357
- IPC: H04N5/357 ; H04N5/225

Abstract:
Embodiments of the present invention are directed to methods and systems for performing automatic lens shading correction using module-specific calibrations. According to one aspect of the invention, a method is provided that is performed over three main stages. During a first stage, radial symmetric component data is determined that is common to camera modules of the type to be calibrated. During the second stage, the actual measurement of the shading profile of one or more specific camera modules is performed. In the third and final stage is the extrapolation stage, the base measurement surfaces of a camera module type determined in the first stage are extrapolated and modified with the module-specific Bezier correction surface and calibration data of the second stage. The output surfaces of this third and final stage are used to correct for the shading profile in the camera module, depending on the light-source estimation.
Public/Granted literature
- US20140184813A1 LENS SHADING CALIBRATION FOR CAMERAS Public/Granted day:2014-07-03
Information query