Ultraviolet camera calibration method and calibration device
A camera calibration and ultraviolet technology, applied in image analysis, image data processing, instruments, etc., can solve the problem of ineffective imaging, and achieve the effect of suppressing the interference of extremely large noise, improving calibration accuracy, and eliminating irregularities in imaging edges.
Active Publication Date: 2019-07-09
GUIZHOU POWER GRID CO LTD
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[0009] In view of this, the purpose of the present invention is to provide a UV camera calibration method, which effectively solves the problem that the conventional calibration plate cannot be effectively imaged under the UV camera
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[0046] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are only for illustrating the present invention, but not for limiting the protection scope of the present invention.
[0047]The design idea of the present invention is to use active luminous ultraviolet lamp beads to replace the reflective calibration objects used in conventional camera calibration, thus solving the problem that the calibration objects are difficult to image under the conditions of ultraviolet cameras. The calibration object captured by the UV camera is the UV lamp bead. Due to the low resolution of the UV image and the high brightness of each lamp bead, it will be imaged as a light spot with irregular edges on the UV image. The center of the light spot is the position of the feature point. To extract the position of the feature point, it is necessary to perform cir...
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The invention discloses an ultraviolet camera calibration method, which comprises the following steps of: 1, establishing a world coordinate system by taking a plane where a calibration plate in an ultraviolet camera calibration device is located as an XoY plane and taking the front of a camera as a Z axis, and determining a coordinate value of each ultraviolet lamp bead on the calibration plate in the world coordinate system; step 2, acquiring the calibration board image shot by the ultraviolet camera; step 3, eliminating part of noise; step 4, performing threshold segmentation on the denoised image; step 5, performing circle fitting on the result of the threshold segmentation; step 6, carrying out non-maximum suppression on a circle fitting result; and step 7, sequentially solving the corresponding relationship between all ultraviolet lamp beads on the calibration plate and the image feature points of the sub-pixel precision of the ultraviolet lamp beads. According to the method, theproblem that a conventional calibration plate cannot effectively image under an ultraviolet camera is effectively solved. In addition, the invention also provides an ultraviolet camera calibration device.
Description
technical field [0001] The invention relates to the field of machine vision processing, in particular to a calibration method for an ultraviolet camera, and also provides a calibration device for an ultraviolet camera. Background technique [0002] In the prior art, the camera projects objects in the three-dimensional world into the image frame by giving a specific imaging geometric model, and this process is called imaging. The geometric model can be described by a series of parameters, these parameters are camera parameters. In order to obtain these parameters, we need to determine through experiments and calculations. [0003] For general cameras, we use the following formula to represent an imaging geometric model: [0004] [0005] In the above formula, [X w Y w Z w ] represents a calibration object point in the world coordinate system, [uv] represents the corresponding position of the calibration object point in the image, the matrix M 1 The elements in are ...
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IPC IPC(8): G06T7/80
CPCG06T7/80
Inventor 陈锦龙陈俊全杜江安成张丹王兴国吴珂范翔黄晓旭朱椤方张旭陈恩黔赵翔宇贺先强郑凯文
Owner GUIZHOU POWER GRID CO LTD