A5014266441- Advanced Optical Imaging Technologies
- Virtual Reality Applications and Impacts
- Photorefractive and Nonlinear Optics
- Tactile and Sensory Interactions
- Face recognition and analysis
- Face and Expression Recognition
- Advanced Image and Video Retrieval Techniques
- Advanced Measurement and Detection Methods
- Autonomous Vehicle Technology and Safety
- Spectroscopy Techniques in Biomedical and Chemical Research
- Image and Video Stabilization
- Optical measurement and interference techniques
- Leaf Properties and Growth Measurement
- Nanowire Synthesis and Applications
- Remote Sensing and Land Use
- Silicon and Solar Cell Technologies
- Optical Coherence Tomography Applications
- Industrial Vision Systems and Defect Detection
- Silicon Nanostructures and Photoluminescence
- Optical Wireless Communication Technologies
- Cell Image Analysis Techniques
- Video Surveillance and Tracking Methods
- Photonic and Optical Devices
Beijing Solar Energy Research Institute
2021
University of Illinois Urbana-Champaign
2017-2020
Auckland University of Technology
2016
Huzhou Vocational and Technical College
2012
Zhengzhou University of Light Industry
2009
The Maxwellian near-eye displays have attracted growing interest in various applications. By using a confined pupil, display presents an all-in-focus image to the viewer where formed on retina is independent of optical power eye. Despite being promising technique, current suffer from limitations such as small eyebox, bulky setup and high cost. To overcome these drawbacks, we present holographic based computational imaging. encoding complex wavefront into amplitude-only signals, can readily...
We present a holographic multiplane near-eye display method based on Fresnel holography and amplitude-only wavefront modulation. Our can create multiple focal images across wide depth range while maintaining high resolution (1080P) refresh rate (60 Hz). To suppress the DC conjugation signals inherent in modulation, we develop an optimization algorithm which completely separates primary diffracted light from at pre-defined intermediate plane. Spatial filtering this plane leads to dramatic...
We present an optical mapping near-eye (OMNI) three-dimensional display method for wearable devices. By dividing a screen into different sub-panels and optically them to various depths, we create multiplane volumetric image with correct focus cues depth perception. The resultant system can drive the eye's accommodation distance that is consistent binocular stereopsis, thereby alleviating vergence-accommodation conflict, primary cause eye fatigue discomfort. Compared previous methods, OMNI...
We present a foveated rendering method to accelerate the amplitude-only computer-generated hologram (AO-CGH) calculation in holographic near-eye 3D display. For given target image, we compute high-resolution foveal region and low-resolution peripheral with dramatically reduced pixel numbers. Our technique significantly improves computation speed of AO-CGH while maintaining perceived image quality fovea. Moreover, accommodate eye gaze angle change, develop an algorithm laterally shift...
In this paper, the authors propose a scheme for human face recognition in complex environments. The proposed consists of three phases: moving object removal, detection and recognition. It could be applied to certain specific environments such as computer users office, shopping mall, reception or pokie machine gamblers casinos. these environments, target recognizing will considered foreground objects (such cars, walking persons etc) background. objective paper is implement so improve...
Abstract We present an all-passive, transformable optical mapping (ATOM) near-eye display based on the “human-centric design” principle. By employing a diffractive element, distorted grating, ATOM can project different portions of two-dimensional screen to various depths, rendering real three-dimensional image with correct focus cues. Thanks its all-passive architecture, features reduced form factor and low power consumption. Moreover, system readily switch between real-three-dimensional...
We present an ultra-compact optical combiner using a waveguide and geometric phase lenses (GPL) for augmented reality displays. By sandwiching the output coupler of planar between two flat, thin GPLs, we create sub-systems with different powers displaying virtual objects transmitting ambient light rays, respectively. implemented our method in scanning-based Maxwellian display demonstrated augmentation all-in-focus Maxwellian-view image real-world within 15° field view. Our device is (50 g)...
Based on digital image processing technique, the paper studied and implemented an analysis software system of foliage feature parameters. The integrated methods Image enhancement, morphological boundary tracking to preprocess photo plant leaves that contains calibration object; use get information, chain code method pixel method, minimum external rectangle (MER) other measure more than ten general characteristics leaf perimeter, including parameters, area rectangular. results showed...
This paper proposed a simple and novel approach for on-road object detection based on vision. Firstly, method is applied to detect the interest pixels of in images by defined function single strategy reduce redundant computation process gray mean squared window; Secondly, all detected neighbored each other are grouped region; after that, non-interest set binarized; The binary could be easily segmented applying contour tracking algorithms. Lastly, several captured from ITS or ALV system used...
Abstract We present a novel design of parameterization image stitching algorithm for ultrashort throw laser MEMS projectors. The resultant method allows the use projectors with short or even long ratios to achieve projection through parameterized stitch multiple images into one single frame, alleviating trade‐off between resolution and frame rate in conventional displays. To evaluate effectiveness, we construct test system that consists three off‐the‐shelf ratio 1.3 planar reflective...
We present a holographic method for augmented reality near-eye display system based on the projection of digital amplitude-only computer-generated hologram (AO-CGH) DMD. The operating principle is upon Fresnel holography and spatial light modulator encodings. resultant can high-resolution 3D image with accurate depth cues. Furthermore, we fully utilize diffraction bandwidth by eliminating DC conjugation noise, providing simple solution to long-standing problem in displays. As result, our low...
Heterojunction crystal‐silicon (c‐Si) solar cells generate current from harvesting light via sweeping excited carriers away under built‐in asymmetry through amorphous silicon layers. However, loss of energy beyond the bandgap is known to hinder their efficiency. Herein, a strategy provided convert short‐wavelength into polarization electrical field and dielectric antenna effect, where enhanced surface passivation carrier collection occur simultaneously. By depositing an ultrathin polarizable...