WIDE field of view camera image calibration and de-warping

A distortion recovery and camera technology, applied in image communication, image enhancement, image data processing, etc., can solve problems such as inability to provide coverage

Inactive Publication Date: 2014-03-26
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to provide a surround view around the entire perimeter of the vehicle with the minimum number of cameras, available wide field cameras with a 135° field of view would not be able to provide the required degree of coverage and, therefore, the cameras would have to be 180° or greater. ultra-wide field of view camera

Method used

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  • WIDE field of view camera image calibration and de-warping
  • WIDE field of view camera image calibration and de-warping
  • WIDE field of view camera image calibration and de-warping

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Embodiment Construction

[0058] Embodiments of the invention discussed below that relate to systems and methods of calibrating and restoring warping of cameras are merely exemplary in nature and are in no way intended to limit the invention or its application or use. For example. The invention applies to calibrating and restoring warping of vehicle cameras. However, it should be understood by those skilled in the art that the present invention can be applied to correct distortions in other cameras.

[0059] figure 1 is an illustration of a vehicle 10 including a surround view camera system including a forward looking camera 12 , a rear looking camera 14 , a right looking camera 16 and a left looking camera 18 . Cameras 12-18 may be any camera suitable for the purposes described herein, many of which are known in the automotive art, capable of receiving light or other radiation, and using, for example, a charge-coupled device (CCD) to convert the light energy into pixel-formatted electric signal. ...

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Abstract

The invention relates to calibration and de-warping of a wide field of view camera image, and specifically provides a system and a method for calibrating and de-warping an ultra-wide field of view camera. The method comprises estimating intrinsic parameters such as the focal length of the camera and an image center of the camera by using multiple measurement values of the near optical axis object points and a pinhole camera model. The method further includes estimating distortion parameters of the camera by using an angular distortion model that defines an angular relationship between an incident optical ray passing an object point in an object space and an image point on an image plane that is an image of the object point on the incident optical ray. The method can include a parameter optimization process to further refine the parameter estimation.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of the priority date of US Provisional Patent Application Serial No. 61 / 705,534, entitled Calibration and Distortion Restoration of Wide Field Camera Images, filed September 25, 2012. technical field [0003] The present invention relates generally to systems and methods for calibration and warp recovery of wide field of view (FOV) cameras, and more particularly to systems and methods for calibration and warp recovery of ultra wide field of view (FOV) vehicle cameras, wherein the The method first estimates the focal length of the camera and the optical center of the camera's image plane, and then uses the angular deformation estimation model to determine the deformation parameters. Background technique [0004] Modern vehicles often include one or more cameras to provide reversing assistance, to capture images of the vehicle's driver to determine how drowsy or attentive the driver i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/232G06T5/00
Inventor W.张J.王B.B.利特库希
Owner GM GLOBAL TECH OPERATIONS LLC
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