| Hyperspectral image data,with spectral band continuous,multiple band,image-spectrum combined,super high spectral resolution and other advantages has widely applied to vegetation types distinguish,rock and mineral identification and ecological environment monitoring and many other fields.Pushbroom hyperspectral imager,because of not having to build up expensive and complex scanning mirror it can also achieve high spatial resolution and spectral resolution,has become the mainstream of the development of hyperspectral imaging technology.Wide application prospect of high spectral imaging is a high requirement for the quality of imaging data.However,for the pushbroom hyperspectral imager,although in the design stage,the stray light is analyzed and the suppression measures are taken,but due to the non ideal characteristics of optical devices that stray light is unavoidable in hyperspectral image data,which reduced the quality of imaging data.Under this background,this paper do research about stray light law and correction method.First of all,under laboratory conditions we induce stray light law of the pushbroom hyperspectral imager by using integrating sphere as light source.According to the statistical analysis of experimental data,the effect of stray light on the laboratory conditions can reach 10%.Based on this,the influence of stray light on the field flight data can reach 1% orders of magnitude.Secondly,based on the stray light law we have got,this paper give a stray light correction for pushbroom hyperspectral imager,and an experiment to get the stray light interference vector of single pixel is designed.Finally,the stray light correction of flight images is carried out.After the correction,the clarity of the image has been improved obviously,and it meets the needs of practical application.The research results of this paper have been applied in pushbroom hyperspectral imager(PHI)in flying experiment,and the instrument has successfully passed the acceptance. |
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