"十"字型四孔径视场部分重叠仿生热成像

To alleviate the contradiction between the field of view and resolution in conventional thermal imaging systems with limited detector technology, the multi-aperture layout mode is studied with image stitching algorithm in the non-overlapped areas and super-resolution processing algorithm in the overlapped areas. The partially overlapped bionic thermal imaging modes of cross-shaped four-aperture and cross-shaped five-aperture field of view are proposed for the multi-aperture layout mode to compare and analyze their uniqueness with respect to the Tian-shaped four-aperture. Using ULIS's miniature uncooled infrared focal plane detector Micro80 GEN2, a system of bionic thermal imaging is developed with cross-shaped four-aperture partially overlapped field of view. This provides a visual mode similar to human vision with high-resolution imaging in the center and large-field search in the periphery, using the non-overlapped areas to increase the imaging field of view and the sub-pixel micro-shift in the overlapped areas to achieve super-resolution. Image processing is performed on the resolution target image, wherein an external scene image is obtained by the experimental system, with blind element removal, non-uniformity correction, image stitching based on perspective transformation, and super-resolution using a spatial integration model for the focal plane detector. The spatially variable resolution images obtained are evaluated both qualitatively and quantitatively. The size of the experimental system is 180 mm×100 mm ×100 mm; the stitching total field of view is 2.36 times that of a single-aperture camera; the overlapping area of the four apertures accounts for 7.78% of the total field of view, and the imaging resolution is improved. The imaging system uses multiple sub-apertures to form multi-view stereo vision to realize stereo imaging. Moreover, it can realize polarization thermal imaging or multi-spectral imaging by installing polarizers or filters, making it suitable for a variety of applications.