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Digital image correction method for continuous variable-focal-length optical imaging system

An optical imaging system and digital image technology, applied in image analysis, image data processing, instruments, etc., can solve problems such as non-linear distortion, strabismus, trapezoidal distortion and correction of the imaging system, and realize automatic online real-time correction on the machine and reduce correction Time, the effect of reducing the number of treatments

Inactive Publication Date: 2015-08-12
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0006] The invention provides a digital image correction method for a continuous zoom optical imaging system to solve the technical problem that the existing image correction method cannot simultaneously correct the nonlinear distortion and squint trapezoidal distortion of the imaging system

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  • Digital image correction method for continuous variable-focal-length optical imaging system
  • Digital image correction method for continuous variable-focal-length optical imaging system
  • Digital image correction method for continuous variable-focal-length optical imaging system

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Embodiment Construction

[0060] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways defined and covered by the claims.

[0061] The preferred embodiment of the present invention provides a digital image correction method for a continuous zoom optical imaging system, which can simultaneously correct the nonlinear distortion caused by the zoom lens and the squint trapezoidal distortion caused by squint photography. The combination of calibration and on-machine online correction, according to the invariance principle of linear perspective projection, uses the single-parameter division model to calibrate the distortion coefficient and distortion center coordinates of the plane template image under several discrete focal length values ​​through the variable step size search method, and establishes the lens The mathematical fitting formula between the distortion coefficient,...

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Abstract

The invention discloses a digital image correction method for a continuous variable-focal-length optical imaging system. The digital image correction method comprises the steps of acquiring planar template images which are photographed by an image camera in a plurality of discrete focal lengths, performing off-line calibration on a distortion parameter which corresponds with each focal length of a variable-focal-length lens; performing curve fitting on the distortion parameter which corresponds with each focal length for obtaining a fitting formula or establishing a distortion parameter lookup table; according to the actual operation focal length of the image camera, obtaining a lens distortion parameter which corresponds with the actual operation focal length through the distortion parameter lookup table or calculation by the fitting formula; and constructing a projection conversion relationship from an image camera coordinate system to a map coordinate system according to position gesture data and the lens distortion parameter in imaging of the image camera, and performing resampling on the pixel brightness value after coordinate conversion for obtaining an orthographic projection image after correction on the squint deformation and lens distortion. The digital image correction method realizes a purpose of simultaneous correction for squint trapezoidal distortion and variable-focal-length nonlinear distortion in the variable-focal-length imaging system.

Description

technical field [0001] The invention relates to the field of digital image processing, in particular to a digital image distortion correction method for a continuous zoom optical imaging system. Background technique [0002] The continuous variable focal length optical system has the advantage of not losing the target during the field of view conversion process, can search and capture fast moving targets, and better realize the functions of searching for targets in a large field of view and distinguishing targets in a small field of view. It has been widely used in measurement and measurement. Due to system manufacturing and assembly errors, the nonlinear distortion characteristics of the zoom lens change with the change of the focal length. At the same time, due to the change of the attitude of the aircraft and the orientation of the camera's boresight, the aerial camera shoots and images the ground at a certain oblique angle, resulting in complex geometry. Deformation ser...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00
Inventor 刘晶红周前飞
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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