Considering the limited pixel number and large pixel size of common display panel, the captured elemental images (EIs) array of high density pixels cannot be reconstructed sufficiently in the display process of integral imaging, because of matched display requirement. To solve this problem, this paper presents a novel approach to improve integral imaging resolution by designing a coded sub-pixel mask on common display panel. Specifically, multi-pixels in the captured EIs are displayed in a pixel in the common display panel with time multiplexing along with the corresponding aperture switched on/off of the coded sub-pixel mask periodically, in which the resolution of the reconstructed image is determined by the coded aperture size of the sub-pixel mask rather than the pixel size of the display panel. Then, the mapping relationship between the displayed pixel and the position of the switched on aperture of the coded sub-pixel mask is established theoretically. Computational reconstruction and optical experimental results show that this method can match the pixel number of the captured EIs with that of the display panel and the resolution of integral imaging can be improved significantly.
Conventional imaging methods will cause a serious distortion for large object plane imaging with a limited object-to-sensor distance (OTSD). Here, we propose an imaging method based on the combination of microlens arrays and aperture arrays to realize the low-distortion, large object plane imaging range (OPIR) and compact design imaging at a close OTSD. Two-stage microlens arrays are utilized to reduce the distance between the object and sensor with low distortion, and two-stage aperture arrays are sandwiched between the microlens arrays to eliminate stray light between different microlenses. The theoretical analysis and simulation results indicate that our proposed method can realize low-distortion imaging with a large OPIR when the OTSD is seriously limited. This imaging method can be used widely in small-size optical devices where the OTSD is extremely limited.
To solve the pseudoscopic problem, we propose a one-step integral imaging system with negative refractive index materials, which can avoid the deterioration in resolution inherent to the optical or digital two-step processes. Specifically, the proposed method is based on the novel feature of negative refractive index materials, bending light to a negative angle relative to the surface normal. The pseudoscopic imaging property of the negative refractive index material slab is theoretically investigated. For formation of orthoscopic reconstructed images, the matching condition of the negative index lens array and the positive index lens array is deduced. Two types of conceptual prototypes of integral imaging system with negative refractive index materials are designed. Experimental results show the validity of the proposed method. To the best of our knowledge, this is the first time to explore the application of negative index materials in eliminating the pseudoscopic effect in integral imaging.
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