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We present a novel slideshow generation concept based on content-aware photo-music mapping. Current technologies for automated personal photo slideshow generation primarily focus on photo presentations and visual effects. These solu tions utilize either a manually chosen single song or preset slideshow songs. Our technology focuses on an automatic soundtrack generation process that attempts to comprehend what the photos depict and choose music accordingly. The process comprises analyzing a photo album, composing an auto-soundtrack by dynamically mapping song segments to photo events, and automatically choosing content-aware tran sitions and visual effects appropriate for the presentation.Index Terms-Personal photo slideshows, music infor mation retrieval, photo information retrieval, emotion recog nition

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A first-principles computational study is presented of various phases of LiAlO2. The relative total energies and equations of state of the α, β and γ phases are determined after structural relaxation of each phase. The β and γ tetrahedral phases are found to be very close in energy and lattice volume with the γ phase having the lowest energy. The octahedral α phase is a high-pressure phase and the transition pressure from the γ and β phases to α is determined to be about 1 GPa. The electronic band structures of each phase at their own equilibrium volume are determined using the quasiparticle self-consistent (QS) GW method as well as using the 0.8Σ approach in which the QSGW self-energy is reduced by a factor 0.8 to correct for the underscreening of W in QSGW . The effective masses of the band edges and the nature of the band gaps are presented. The lowest energy γ phase is found to have a pseudodirect gap of 7.69 eV. The gap is direct at Γ but corresponds to a dipole forbidden transition. The imaginary part of the dielectric function and the absorption coefficient are calculated in the long-wavelength limit and the random phase approximation, without local field or electron-hole interaction effects for each phase and their anisotropies are discussed. Si doping on the Al site is investigated as a possible n-type dopant in γ-LiAlO2 using a 128 atom supercell corresponding to 3.125 % Si on the Al sublattice in the generalized gradient approximation and a smaller 16 atom cell with 25 % Si in the QSGW approximation. The Si is found to significantly perturb the conduction band and lower the gap but a clearly separated deep donor defect level is not found. However, the donor binding energy is still expected to be relatively deep, of order a few 0.1 eV in the hydrogenic effective mass approximation.