Camera distortion correcting method based on square target model and perspective projection

A technology of distortion correction and square target model, applied in image data processing, instrumentation, calculation, etc., can solve problems such as complex calibration process and principle, large calculation workload, and inability to overcome assembly error distortion

Active Publication Date: 2014-04-16
TONGJI UNIV
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Problems solved by technology

The disadvantage of the geometric distortion model is that the three distortion parameters are coupled with each other, and the model is complex, which brings a large computational workload and cannot overcome the distortion caused by assembly errors.
This method of image correction can solve the distortion caused b

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  • Camera distortion correcting method based on square target model and perspective projection
  • Camera distortion correcting method based on square target model and perspective projection
  • Camera distortion correcting method based on square target model and perspective projection

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Embodiment Construction

[0042] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0043] Taking the image taken by the camera as the object, the size and pixel position of the ideal image are calculated according to the information of the calibration object, and the process of distortion correction is completed. This process does not use a distortion model, and can well overcome image distortion caused by camera components and assembly errors.

[0044]A camera distortion correction method based on a square target model and perspective projection. This method first establishes a space coordinate system with the center of the camera as the origin, and uses the square target model to calculate the grid point target plane at The plane equation in the camera coordinate system; the grid corresponding to the original image is generated on the above plane, and the grid points are projected onto the imaging surface to form ideal gr...

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Abstract

The invention relates to a camera distortion correcting method based on a square target model and perspective projection. According to the method, firstly, a space coordinate system with the center of a camera as an original point is built, the plane equation of a grid point target plane on a camera coordinate system is calculated by the adoption of the square target model according to the coordinates of a target spot in the center of an image; a grid corresponding to the original image is generated on the plane, grid points are projected on an imaging plane, and ideal grid points are formed; according to the one-to-one correspondence relation between the grid points of the original image and the ideal grid points, interpolation is carried out in the image in a blocking mode, and each pixel on the original image is corrected to be at the ideal position. Compared with the prior art, a distortion model is not used, the computing process is simple, and the image distortion caused by errors of camera components and assembly is well overcome.

Description

technical field [0001] The invention relates to a method for correcting geometric distortion of an industrial fixed-focus camera image, in particular to a method for correcting camera distortion based on a square target model and perspective projection. Background technique [0002] Due to the physical nonlinear characteristics of the camera lens, it is inevitable to cause distortion of the shape of the object on the image during the imaging process. This geometric distortion not only affects the visual effect of the collected images, but if it is directly applied to industrial close-range measurement, it will reduce the measurement accuracy of the camera and adversely affect the results. There are still various errors in the camera's component processing and lens assembly process, which will also aggravate the geometric distortion of the image. Ordinary industrial cameras are low in cost and easy to use, but there are disadvantages such as large distortion and serious geom...

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Application Information

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IPC IPC(8): G06T7/00
Inventor 袁勇艾青王辉欧飞奇
Owner TONGJI UNIV
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