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Fisheye image correction method based on spherical model

A technology of fisheye image and correction method, which is applied in image enhancement, image data processing, instruments, etc., and can solve problems such as complex calculations

Inactive Publication Date: 2015-03-25
BEIJING INST OF ENVIRONMENTAL FEATURES
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  • Summary
  • Abstract
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Problems solved by technology

Treat the fisheye lens imaging surface as a paraboloid, and use it to restore the depth of the scene to get a more accurate effect, but the calculation is too complicated

Method used

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  • Fisheye image correction method based on spherical model
  • Fisheye image correction method based on spherical model
  • Fisheye image correction method based on spherical model

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Embodiment Construction

[0056] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings. The inventive method is divided into three steps altogether:

[0057] 1. Using spherical perspective projection constraints to obtain deformation parameters;

[0058] 2. Convert plane coordinates to spherical coordinates;

[0059] 3. Express the spherical coordinates according to the longitude and latitude mapping to obtain the corrected result map.

[0060] The image corrected by this method does not miss any information, and the algorithm is fast and accurate, which can meet the requirements of this system.

[0061] 1. Select the model

[0062]The spherical coordinate positioning expansion method is only suitable for rough correction, and its final effect is not ideal; the polynomial coordinate transformation method and its improved algorithm are too computationally intensive and the processing speed is slow; the stereo vision cal...

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Abstract

The invention belongs to the technical field of photoelectric product application, and particularly relates to a fisheye image correction method based on a spherical model. The method comprises the steps that firstly, deformation parameters are acquired through spherical perspective projection constraints; secondly, plane coordinates are converted into spherical coordinates; thirdly, the spherical coordinates are expressed through latitude-longitude projection to obtain a corrected result map. An image corrected through the method is free of information leakage, and the algorithm is fast and accurate and can meet requirements of a system.

Description

technical field [0001] The invention belongs to the field of photoelectric product application technology, and in particular relates to a fisheye image correction method based on a spherical model. Background technique [0002] There are two ways of fisheye image correction algorithm: [0003] 1. Deformation correction of fisheye images from 2D and 3D spaces: [0004] (1) 2D fisheye image distortion correction. Directly determine the transformation of the corresponding point coordinates on the image to be corrected and the deformed image, and then perform pixel grayscale interpolation. [0005] (2) 3D fisheye image distortion correction. There are two methods of fisheye lens calibration and projection transformation. The fisheye lens calibration algorithm can be accurately restored. After the fisheye lens deformation model is established, because the fisheye lens imaging has various distortion models such as thin prism distortion, it is necessary to establish an accurate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 周刊
Owner BEIJING INST OF ENVIRONMENTAL FEATURES
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