4 research outputs found
SCUT-FBP5500: A Diverse Benchmark Dataset for Multi-Paradigm Facial Beauty Prediction
Facial beauty prediction (FBP) is a significant visual recognition problem to
make assessment of facial attractiveness that is consistent to human
perception. To tackle this problem, various data-driven models, especially
state-of-the-art deep learning techniques, were introduced, and benchmark
dataset become one of the essential elements to achieve FBP. Previous works
have formulated the recognition of facial beauty as a specific supervised
learning problem of classification, regression or ranking, which indicates that
FBP is intrinsically a computation problem with multiple paradigms. However,
most of FBP benchmark datasets were built under specific computation
constrains, which limits the performance and flexibility of the computational
model trained on the dataset. In this paper, we argue that FBP is a
multi-paradigm computation problem, and propose a new diverse benchmark
dataset, called SCUT-FBP5500, to achieve multi-paradigm facial beauty
prediction. The SCUT-FBP5500 dataset has totally 5500 frontal faces with
diverse properties (male/female, Asian/Caucasian, ages) and diverse labels
(face landmarks, beauty scores within [1,~5], beauty score distribution), which
allows different computational models with different FBP paradigms, such as
appearance-based/shape-based facial beauty classification/regression model for
male/female of Asian/Caucasian. We evaluated the SCUT-FBP5500 dataset for FBP
using different combinations of feature and predictor, and various deep
learning methods. The results indicates the improvement of FBP and the
potential applications based on the SCUT-FBP5500.Comment: 6 pages, 14 figures, conference pape
Miniaturizable Phase-Sensitive Amplifier Based on Vector Dual-Pump Structure for Phase Regeneration of PDM Signal
Phase sensitive amplification is indispensable in promoting applications such as all-optical regenerators, quantum communications, all-optical analog-to-digital conversion, and long-distance communications. In this article, we proposed a vector dual-pump nondegenerate phase-sensitive amplification scheme based on ultra-silicon-rich nitride (Si7N3) waveguide, and theoretically verified its capability for all-optical regeneration of phase-encoded polarization-division multiplexing (PDM) signal without the need for complex polarization diversity structures. We achieved a gain extinction ratio (GER) of ∼37.5 dB by using a 3-mm-long Si7N3 waveguide with a high nonlinear coefficient (∼279 /W/m). Signal quality before and after regeneration is characterized by constellation diagram and error vector magnitude (EVM). The results show that the EVM of the degraded PDM differential phase-shift keying (DPSK) signals with two polarization states of 54% and 53.8%, can be improved to 13.6% and 13.6%, respectively, after regeneration, directly illustrating the remarkable phase noise suppression effect. The applicability of the scheme in PDM quadrature phase shift keying (QPSK) signals was further investigated. Similarly, the EVMs of the two polarization states of the deteriorated QPSK signals are optimized from 28.9% and 29.3% to 13.7% and 13.9%, respectively. The proposed scheme has promising applications in integrated all-optical processing systems and long-distance transmission of optical communications