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Rail train line-scan digital camera image distortion correction method

An image distortion correction and line array camera technology, applied in the field of rail train images, can solve problems such as high error, instability, and low efficiency of correction methods, and achieve high reliability, accurate correction, and avoid the loss of image information

Active Publication Date: 2019-11-05
广州运达智能科技有限公司
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Problems solved by technology

[0005] The technical problem to be solved by the present invention is: the correction method of the existing linear array camera image distortion has low efficiency, high error and instability.

Method used

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  • Rail train line-scan digital camera image distortion correction method
  • Rail train line-scan digital camera image distortion correction method
  • Rail train line-scan digital camera image distortion correction method

Examples

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Embodiment

[0045] Such as Figure 1 to Figure 8 As shown in Fig. 1 , a method for image distortion correction of rail train line array cameras uses an undistorted train line array camera image of the same type of train as a standard template, denoted as template image A, for each single carriage or single carriage of the train One section, respectively image correction; including the following steps:

[0046] Denoted as A to represent the template image (such as figure 1 shown), B represents the distorted image (such as figure 2 shown), where A is an m A ×n A The matrix, B is a m B ×n B matrix, since the distortion of the line scan camera will only be generated in the horizontal direction, so m A =m B . In this example, m A =m B =256,n A =571,n B =543.

[0047] Moreover, the entire image correction process is evaluated by image root mean square error (RMSE), and its calculation formula is

[0048]

[0049] Among them, RMSE(X,Y) represents the root mean square error betw...

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Abstract

The invention discloses a rail train line-scan digital camera image distortion correction method, which comprises the following steps of: taking a distortionless train line-scan digital camera image of the same model as a standard template, and respectively performing image correction on each single carriage or one section of the single carriage of a train; subjecting the image to oversampling processing before image distortion correction is carried out, so that image information loss possibly caused when the image contour is extracted in the next step can be avoided; extracting the image contour before the minimum norm optimization problem is established so that the possible influence of illumination difference, dust, water stain, stain and random noise interference between the standard template image and the distorted image can be effectively solved, correction is enabled to be more accurate and the reliability is enabled to be higher. According to the method, a linear equation problem is converted into a constraint problem of a minimum norm, and solving is carried out through an optimization method, so that a more stable and reliable reduction matrix can be obtained, and a corrected result is more stable and reliable.

Description

technical field [0001] The invention relates to the technical field of rail train images, in particular to a method for correcting image distortion of a rail train line array camera. Background technique [0002] In the field of train appearance imaging in the field of rail transit, since the length of the train is much greater than the width and height of the train, line scan camera imaging is often the first choice for fine imaging of the train appearance. If the shooting frequency of the line-scan camera is fixed, since it is impossible for the train to pass the line-scan camera every time at the same agreed calibration speed (that is, the speed that matches the shooting frequency) at a constant speed, the line-scan camera will inevitably capture Distorted train image. [0003] For the above problems, on the one hand, most of the existing processing methods are to measure the speed of the train, and change the shooting frequency of the line array camera according to its ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06F17/11
CPCG06F17/11G06T5/80
Inventor 邹梦胡远江卜显利黄峻刘晓曼卢康刘正一曾玲郭海涛
Owner 广州运达智能科技有限公司
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