Recent progress in 3D object detection from single images leverages monocular depth estimation as a way to produce pointclouds, turning cameras into pseudo-lidar sensors. These two-stage detectors improve with the accuracy of intermediate network, which can itself be improved without manual labels via large-scale self-supervised learning. However, they tend suffer overfitting more than end-to-end methods, are complex, and gap similar lidar-based remains significant. In this work, we propose...

The present study aimed to reflect the current situation of social participation in rural areas China, willingness participate activities, association between health-related quality life and participation, factors related participation.A total 2644 adults aged 60 years older were randomly selected surveyed with a self-rating questionnaire. We used unified definition our study. Medical Outcomes Study Short-Form Health Survey was measure life.The overall engagement activities 26%. Those who...

The theoretical operation and experimental demonstration of a Fourier transform imaging spectropolarimeter for real time measurement the polarization state light are presented. uses Wollaston prism as birefringent interferometer two high-order retarders to incorporate channeled polarimetry. Compared with previous instruments, most significant advantage described model is that complete wavelength-dependent acquired simultaneously along one-dimensional spatial image by single snapshot. Also,...

Loop closure detection is a crucial module in simultaneous localization and mapping (SLAM), which reduces the accumulative error building environment map. Traditional appearance-based methods mostly utilize hand-crafted features, are designed based on human expertise. Recent advances deep learning inspire us to investigate its application loop detection. Different from traditional approaches, automatically learn features raw data has better adaptability complex changes. In this paper, we...

Theory and simulations of a novel hyperspectral imaging polarimeter for remote sensing are presented. The spectropolarimeter is formed by cascading two laser servocontrol modified wave plates (MWP) polarization interference spectrometer (PIIS). Using the phase modulation MWPs, this setup enables PIIS, originally developed C. Zhang, to be extended full detection without dividing fringes into channels as that in Oka's original channeled polarimeter. In way, we can get information with higher...

A compact Fourier-transform imaging spectropolarimeter covering a 450-1000 nm spectral range is presented. The sensor, which based on two birefringent retarders and Wollaston interferometer, offers significant advantages over previous implementations. Specifically, with no internal moving parts, electrically controllable or micro polarization components, the full wavelength-dependent state of polarization, spatial information scene can be acquired simultaneously. Outdoor measurements several...

Abstract Purpose Few studies explored the relationship between family doctor contract services (FDCS) and health-related quality of life (HRQOL) among patients with chronic diseases in rural China. This study aims to explore status signing on FDCS HRQOL examine whether there are differences different socioeconomic (SES). Methods A total 1,210 respondents were included this study. was measured by EQ-5D-3L. The contracting divided into uncontracted contracted. Tobit regression Logistic...

The spectral information contained in the hyperspectral images (HSI) distinguishes intrinsic properties of a target from background, which is widely used remote sensing. However, low imaging speed and high data redundancy caused by resolution spectrometers limit their application scenarios with real-time requirement. In this work, we achieve precise detection camouflaged targets based on snapshot multispectral technology band selection methods urban-related scenes. Specifically, algorithm...

When a landslide happens, it is important to recognize the hazard-affected bodies surrounding for risk assessment and emergency rescue. In order realize recognition, spatial relationship between landslides other geographic objects such as residence, roads schools needs be defined. Comparing with semantic segmentation instance that can only separately, image captioning provide richer information including among these objects. However, traditional methods based on RNNs have two main...

A broadband snapshot complete imaging polarimeter (BSCIP), covering 400-700 nm, is presented. The device, which based on two cascade Sagnac-grating interferometers, offers significant advantages over previous implementations. Specifically, with no moving parts, electrically controllable or micro-polarization elements, the full polarization images of a scene can be acquired in single frame. operation principle system explained by using Mueller calculus. Optical efficiency and interference...

摘要:

Hyperspectral image super resolution (SR) reconstruction has been studied widely and many algorithms have proposed. In this paper, a novel method was designed by employing joint spectral-spatial sub-pixel mapping model which aims to obtain the probabilities of sub-pixels belong different land cover classes dividing mixed pixels into several sub-pixels. Given these probabilities, enhanced can be further generated. The proposed approach evaluated using both synthetic real hyperspectral images...

The principle and experimental demonstration of a spectral resolution enhanced static Fourier transform spectrometer (SESFTS) is presented. device, which based on birefringent retarder array Wollaston prism, offers significant advantages over previous (FT) implementations. Specifically, its use an ultra-compact common-path interference structure creates simple robust while preserving their high throughput wide free range. operation the device explained in detail with design example 7 cm-1,...

A polarization splitter is proposed in a photonic crystal fiber with hybrid guidance mechanisms, i.e., total internal reflection and antiresonant reflection. High extinction ratios are achieved compact structure over wavelength range. Moreover, the operating wavelength, splitting length, bandwidth can be controlled accurately through control of refractive index fiber. Our research offers deep physical insight into novel light transmission phenomenon useful for future applications device.

Existing static dispersive and interference imaging spectrometers use fixed spectral resolution to obtain a data cube. To satisfy variety of application requirements, the range must be large fine. This will result in huge reducing S/N ratio instruments. solve these problems, novel birefringent Fourier transform spectrometer with zooming capability is proposed. Operating concept, theory experimental demonstration are presented validate that designed setup has wide capability. It can adapt...

Integrated navigation system is becoming the trend of land vehicle system. Therefore it has great meaning to study key technologies involved, especially relative electronic map. Based on these, combining with practical vehicleGPS/dead-reckoning/electronic-map integrated system, two problems map are emphatically introduced in this paper. One an improved map-matching algorithm based pattern recognition, because integrates advantages projection and therefore very fast efficient. Another a route...

The corrected approach for increasing the filed-of-view of polarization imaging spectrometer based on Savart polariscopes is presented.

In this paper, a method of analyzing the equestrian sport based on body sensor network is introduced. This uses inertial sensors to analysis motion characteristics key parts in process sport, so as provide references for correction posture. paper first arranges wireless nodes surface by analysing then RAW data can be accepted through 2.4G channel. Next, three dimensional attitudes each node are calculated gradient descent method, and we compared estimated attitude with actual process....