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Fish-eye lens correction method and device and portable terminal

A fisheye lens and correction method technology, which is applied in image data processing, instruments, calculations, etc., can solve the problems of fisheye image correction technology such as high complexity, high calculation amount, and increased implementation difficulty, so as to reduce distortion parameters and camera parameters Quantity, reduction in workload, effect of easy calculation

Active Publication Date: 2018-03-06
ARKMICRO TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a fisheye lens correction method, device and portable terminal, aiming to solve the problem that the existing fisheye image correction technology has high complexity, requires a high amount of calculation, and increases the difficulty of implementation

Method used

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  • Fish-eye lens correction method and device and portable terminal
  • Fish-eye lens correction method and device and portable terminal
  • Fish-eye lens correction method and device and portable terminal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] see figure 1 , is the flow chart of the correction method for the fisheye lens provided in Embodiment 1 of the present invention. It should be noted that if there are substantially the same results, the correction method for the fisheye lens of the present invention does not use figure 1 The flow sequence shown is limited. The method comprises the steps of:

[0029] S101. Acquire a fisheye image of a calibration plate captured by a fisheye lens.

[0030] In Embodiment 1 of the present invention, S101 may specifically be: acquiring a fisheye image of a plane calibration plate captured by a fisheye lens.

[0031] S102. Taking the parameter value of the fisheye lens theory as the initial value, taking the coordinates of the center point of the fisheye image as the initial value of the distortion center of the fisheye image, using the equidistant projection model, performing distortion correction on the fisheye image to obtain the image content as calibration The initial...

Embodiment 2

[0051] see figure 2 , Embodiment 2 of the present invention provides a correction device for a fisheye lens, the device includes:

[0052] Obtaining module 11, for obtaining the fisheye image of the calibration plate that fisheye lens takes;

[0053] The initial correction module 12 is used to use the parameter value of the fisheye lens theory as the initial value, take the coordinates of the center point of the fisheye image as the initial value of the distortion center of the fisheye image, and use the equidistant projection model to correct the distortion of the fisheye image The obtained image content is the initial calibration map of the calibration plate, and the parameter values ​​include the distortion center coordinates of the image, the focal length value and the aspect ratio value of the unit pixel;

[0054] The feature point module 13 is used to obtain all the corner points of the calibration plate from the initial calibration map, re-project the corner point coo...

Embodiment 3

[0057] Embodiment 3 of the present invention also provides a computer-readable storage medium, the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the fisheye lens as provided in Embodiment 1 of the present invention is implemented. The steps of the calibration method.

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Abstract

The invention is suitable for the digital image processing field and provides a fish-eye lens correction method and device and a portable terminal. The method comprises the following steps: carrying out distortion correction on a fisheye image through an equidistant projection model to obtain an initial correction image, the image content of which is a calibration board; obtaining all angle pointsof the calibration board from the initial correction image, re-projecting angle point coordinates to the fisheye image to obtain rough angle point coordinate values of the calibration board in the fisheye image, and serving the angle points as feature points in the fisheye image; and carrying out iteration on the feature points in the fisheye image to obtain different parameter values within a preset parameter range, carrying out correction on the fish-eye lens through the equidistant projection model, and serving the parameter value obtained when the deviation amount is minimum as an accurate correction value of the fish-eye lens. The fish-eye lens correction method reduces preparation workload in the early stage, and is simple in operation process; a camera does not need to change position and angle; and the fish-eye lens correction method is wide in application range, does not need to set a lot of parameters, is simple to calculate, and meanwhile, realizes an accurate fisheye correction effect.

Description

technical field [0001] The invention belongs to the field of digital image processing, and in particular relates to a fisheye lens correction method, device and portable terminal. Background technique [0002] Fisheye lens belongs to a kind of all-round vision system, its field of view is very large, and the information contained in the image is very rich. Covers an area from 180 degrees to 270 degrees. It has great applications in medical detection, security monitoring, navigation, national defense and military, etc. [0003] The shorter the focal length of the camera and the larger the viewing angle, the more serious the distortion of the image will be. Therefore, the image information collected by the fisheye lens has very serious nonlinear distortion. In order to obtain the true position and feature information of the image content from the fisheye image, distortion correction is required. The correction of the fisheye lens first needs to establish a distortion model...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/80
CPCG06T7/80
Inventor 胡煦辉刘俊秀周显文石岭
Owner ARKMICRO TECH
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