Research On The Multi Aperture And Multi Dimension Synchronous Detection System And Its Key Problems

As the bases of target detection,visual detection has been widely used for its noncontact passive imaging ability and the excellent environmental adaptability.At present,most imaging information comes from the intensity detection of the reflected light of target.However,with the expansion of imaging system and detection environment,especially in the detection of weak target from complex environment and long distance,the imaging effect is limited by background interference and the lack of target features.In order to prevent the interferences in detection and enhance the imaging effect on long range targets,several new imaging dimensions can be added on the system.As one part of the electromagnetic wave,light contains several properties in different dimensions,like intensity,light-field property,spectrum,phase and polarization.These properties record the information of detected target.By obtaining and resolving these properties of light,the information of detected target can be improved greatly.Meanwhile,these properties have their own application range,which means we can avoid the deterioration of image quality and expand the application scenarios in extreme environments.In this paper,a multi-aperture imaging system combining light-field,infrared and polarization information is proposed.By this system,the multidimensional information of targets can be reconstructed by imaging,fusing and calculating of detected images from one dimensional detection.The main contents and innovation points in my work include the following aspects:1.The construction and evaluation of imaging system is proposed.First,selecting the structure of system by analyzing the advantages and disadvantages of different target structure and imaging methods.Second,the imaging method of the system is sorted out through calibration of the imaging system,one-dimensional imaging and multi-dimension fusion.Finally,the application scenes of the system are defined.2.The internal and external parameters calibration method on long distance is studied.By analyzing the results of remote calibration under the influence of atmospheric turbulence,noise defocus and other factors,the random drift of feature points is studied and the calibration error under the influence of complex factors is reduced by various means and the accuracy of remote calibration is improved.3.By the multi-aperture structure,a light-field imaging module is constructed,which can be used on digital refocusing of the target and 3D scale information extraction of the target in the laboratory and the field.The sub-pixel registration method improves the accuracy of long-distance distance extraction.At the same time,through the combination of synthetic aperture imaging and multi-aperture imaging theory,the imaging resolution and measurement accuracy of the imaging system on multi-aperture system can be improved.4.Combining the principle of light field imaging with phase space optics.The local filtering and noise phase unwrapping based on Wigner distribution is proposed by the connection between Wigner distribution of optics and images.By analyzing the possibility of these methods based on hardware implementation,a pre-research of the development of light-field imaging module in the imaging system is proposed.5.For the dimension of polarization and infrared light,the complementary effects of those dimensions on visible light imaging are investigated and analyzed.Meanwhile,some verification experiments are carried out to prove the imaging capability of the multidimensional imaging system in complex environment.