Multi-spectral imaging illumination space non-uniformity correction method
A technology of non-uniformity correction and multi-spectral imaging, which is applied in spectrum investigation and other directions, can solve the problems of poor quality of multi-spectral imaging, achieve the effect of improving multi-spectral imaging quality, easy implementation, and quality improvement
Active Publication Date: 2019-05-10
浙江天斌进出口有限公司
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Problems solved by technology
[0005] The purpose of the present invention is to overcome the problem of poor multi-spectral imaging quality due to the non-uniformity of illumination space caused by the physical characteristics of the light source in the existing multi-spectral imaging system in the prior art, and provides a method that can improve Multispectral Imaging Illumination Spatial Nonuniformity Correction Method for Multispectral Imaging Quality
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Embodiment
[0028] Embodiment: The multi-spectral camera adopted in the present invention is a color filter wheel type, and 16 channels are formed by 16 interference color filters, and the peak half-maximum widths of the 16 color filters are 20nm, and the peak transmittance wavelengths are respectively 400nm, 420nm, 440nm, 460nm, 480nm, 500nm, 520nm, 540nm, 560nm, 580nm, 600nm, 620nm, 640nm, 660nm, 680nm and 700nm. Use white matte photo paper for the calibration whiteboard. The lighting source adopts D65 light source.
[0029] like figure 1 A method for adaptively reconstructing spectral reflectance using a multispectral camera is shown, including the following steps:
[0030] (1-1) Under the D65 illumination light source, the multispectral camera is used to shoot the target object, and the multispectral image of the target object is obtained. The number of spectral channels of the multispectral camera is 16, and a total of 16 channel images are formed, wherein the second channel ( 420...
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The invention discloses a multi-spectral imaging illumination space non-uniformity correction method. The multi-spectral imaging illumination space non-uniformity correction method comprises the stepsof: firstly, shooting a multi-spectral image of a target object by utilizing a multi-spectral camera under an illumination light source, keeping the position of the multi-spectral camera the same, putting a space uniformity correction white board at the position of the target object, covering the whole target object, shooting the multi-spectral image of the correction white board, covering the lens of the multi-spectral camera by using a lens cover, acquiring the dark field image of the multi-spectral camera, respectively deducting the dark field image by the multi-spectral images of target object and the correction white board, and correcting the multi-spectral image of the target object channel by channel by utilization of the multi-spectral image of the correction white board. The method disclosed by the invention has the characteristics of being capable of eliminating influence of the illumination space non-uniformity of the illumination light source onto the multi-spectral imaging, and improving the multi-spectral imaging quality.
Description
technical field [0001] The invention relates to the technical field of multi-spectral camera imaging quality correction, in particular to a method for correcting multi-spectral imaging illumination space non-uniformity capable of improving multi-spectral imaging quality. Background technique [0002] The illumination source is an indispensable part of the multispectral imaging system, and the power, spectral characteristics and stability of the light source will affect the quality of multispectral image acquisition. The light source should have a large spectral power in the entire visible light band. For applications aimed at reconstructing the spectral reflectance, the spectral power distribution of the light source should be as smooth as possible. If several light sources are used at the same time, they should have the same spectrum Power distribution, and the spatial uniformity of spectral power distribution and light intensity should be guaranteed. [0003] However, in ...
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Inventor 徐鹏汪杭军
Owner 浙江天斌进出口有限公司