| Skin lesions can cause changes in skin tissues.When light waves are reflected off the skin surface,they contain polarization information about the skin’s state.The polarization information of skin state can be obtained by analyzing the polarization information of reflected and refracted lightwaves.Based on the theory of polarization detection,this paper designs a set of polarization imaging system illuminated by active light source of skin,which aims to detect the polarization spectrum of skin target,and complete the detection of target contour,surface and shallow surface information in skin abnormal area.In this paper,a skin active light source illumination polarization imaging system is constructed by combining with the split-focal plane polarization camera.Firstly,relevant experiments were carried out from the incident Angle of light source to determine the appropriate incident Angle,which laid the foundation for subsequent experiments.Then,the experiment through green wavelength and red wavelength LED to polarization imaging and laser illumination respectively,and the subjective and objective evaluation parameters is used to determine the polarization imaging quality,it is concluded that the polarization laser illumination image resolving power is far superior to the conclusion of the polarization images of LED lighting,verified the advantages of polarization image compared with light intensity image in active illumination imaging.Finally,under 488 nm and 520 nm,660 nm wavelength laser illumination skin polarization imaging experiments of different state,and the structure similarity assessment of polarization images under different laser illumination,found under three kinds of band laser illumination polarization images have very big difference,that image reflects the skin of different depth under the different state of polarization information;Furthermore,the boundary between normal and abnormal skin regions can be distinguished by the degree of polarization. |
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