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A method for correcting optical distortion of a line scan camera

A line-scan camera and optical distortion technology, applied in the field of three-dimensional measurement, can solve the problems that area-scan cameras are not suitable for line-scan cameras, etc., and achieve the effects of good correction effect, convenient and simple preparation, and easy operation

Active Publication Date: 2020-05-19
HARBIN INST OF TECH
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Problems solved by technology

Area array cameras are calibrated based on two-dimensional images, while line array cameras can only obtain one-dimensional images. Therefore, the calibration method of area array cameras is not suitable for line array cameras

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  • A method for correcting optical distortion of a line scan camera
  • A method for correcting optical distortion of a line scan camera
  • A method for correcting optical distortion of a line scan camera

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Embodiment Construction

[0038] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings, but it is not limited thereto. Any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention should be covered by the present invention. within the scope of protection.

[0039] The invention provides a method for correcting optical distortion of a line array camera, the specific implementation steps are as follows:

[0040] 1. Make the calibration board: such as figure 1 As shown, the calibration board is drawn with an X-Y coordinate system, 6 oblique lines and 7 straight lines, one of which is coincident with the Y axis and intersects at the origin of the coordinate axis, and the rest of the straight lines are set parallel to the Y axis and Intersecting on the X-axis, the distance between every two adjacent straight l...

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Abstract

The invention discloses a method for correcting optical distortion of a line array camera. The steps are: 1. Make a calibration plate with an X-Y coordinate system, multiple oblique lines and multiple straight lines; 2. Align and calibrate the line array camera. board, define the intersection points of the line array camera's line of sight and multiple straight lines and multiple diagonal lines on the calibration board as feature points; 3. Take photos of the calibration board to obtain one-dimensional information of the feature points on the image surface of the line array camera, and Calculate the position information of each feature point; Step 4: Match the camera data from one dimension to two dimensions to adapt to the calibration method of the area array camera; Step 5: Establish the relationship between the world coordinate system and the image plane coordinate system, and obtain The intrinsic and extrinsic parameters of the camera; Step 6: After obtaining the distortion coefficient, correct the camera distortion. The preparation of the calibration plate in the present invention is convenient and simple, and the operation is easy; the conversion of one-dimensional to two-dimensional image data is realized, and the distortion correction of the line array camera image can be realized through coordinate conversion.

Description

technical field [0001] The invention relates to a distortion correction method of an optical system, in particular to a method for realizing distortion calibration and correction of a line array camera itself, which can be applied to three-dimensional measurement fields such as construction, transportation, and aircraft. Background technique [0002] The distortion of the optical lens changes with the change of the field of view, and directly affects the geometric position accuracy of the imaging, resulting in image distortion. For an optical system with a large field of view, distortion correction is particularly important. [0003] Optical distortion correction technology refers to the use of digital image processing methods to calibrate and correct the distortion of the optical lens itself, and eliminate the measurement error caused by image deformation. It can effectively solve the problem of reducing the geometric position accuracy of objects in the image due to lens dis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T7/80
CPCG06T5/80
Inventor 朱瑶王治乐周程灏贺磊陆敏林菲
Owner HARBIN INST OF TECH
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