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For the dermoscopy image, uneven illumination will influence segmentation accuracy and lead to wrong aided diagnosis result. In this paper, an uneven illumination removal method based on deep learning is proposed for dermoscopy images. Different from the traditional Retinex based methods, which estimate the illumination component using statistical methods to obtain the reflectance component of the...
We have reported a photo-tunable photonic crystal device whose reflection at the stop-band position can be switched between valley and peak. The reflection spectrum of the device can be reversibly switched by ultraviolet and visible light irradiation.
Lithium niobate (LiNbO3) is one of the most important ferroelectric and nonlinear optical crystals and has many technological applications. But few fundamental theoretical studies on it are reported. The band structure and optical properties of this crystal are calculated within the framework of density functional theory with generalized gradient approximation (DFT-GGA). The results show that the...
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