A5079611788- Optical Wireless Communication Technologies
- Indoor and Outdoor Localization Technologies
- Handwritten Text Recognition Techniques
- Image Processing and 3D Reconstruction
- Underwater Vehicles and Communication Systems
- Image Enhancement Techniques
- Impact of Light on Environment and Health
- Radio Wave Propagation Studies
- Natural Language Processing Techniques
- Advanced Photonic Communication Systems
- Ocular and Laser Science Research
- Image and Object Detection Techniques
- Smart Parking Systems Research
- Advanced Optical Sensing Technologies
- Vehicle License Plate Recognition
- CCD and CMOS Imaging Sensors
South China University of Technology
2017-2022
Complementary metal-oxide-semiconductor (CMOS) sensor based visible light positioning (VLP) has been widely studied in recent years due to its high robustness and precision. In most researches about CMOS VLP, researchers always focus on the high-precision algorithm but ignore that accuracy of LED-ID detection recognition plays a more important role VLP system. Without correct LED-ID, would be meaningless no matter how effective it is. addition, is not required applications since enough for...
Recently, visible light communication (VLC) has gradually become a research hotspot in indoor environments because its advantages of illumination and relative high positioning accuracy. But unfortunately, the matter algorithm complexity accuracy, most existing VLC-based systems fail to deliver satisfactory performance. Moreover, majority them are based on two-dimensional (2-D) plane. In addition, some realize 3-D base various sensors or hybrid complex algorithm. These methods greatly reduce...
Online and offline handwritten Chinese text recognition (HTCR) has been studied for decades. Early methods adopted oversegmentation-based strategies but suffered from low speed, insufficient accuracy, high cost of character segmentation annotations. Recently, segmentation-free based on connectionist temporal classification (CTC) attention mechanism, have dominated the field HCTR. However, people actually read by character, especially ideograms such as Chinese. This raises question: are...
An indoor positioning algorithm based on visible light communication (VLC) is presented. This used to calculate a three-dimensional (3-D) coordinate of an optical wireless environment, which includes sufficient orders multipath reflections from reflecting surfaces the room. Leveraging global optimization ability genetic (GA), innovative framework for 3-D position estimation modified proposed. Unlike other techniques using VLC positioning, proposed system can achieve localization without...
This paper proposes a three-dimensional (3-D) high-precision indoor positioning strategy using Tabu search based on visible light communication. is powerful global optimization algorithm, and the 3-D can be transformed into an optimal solution problem. Therefore, in positioning, receiver coordinate obtained by algorithm. For all we know, this first time algorithm applied to positioning. Each light-emitting diode (LED) system broadcasts unique identity (ID) transmits ID information. When...
Dual camera is becoming increasingly prevalent among smartphone schemes these days. This paper demonstrates a system prototype by using the color and monochrome cameras on one simultaneously for visible light communication. To achieve this, we propose novel dual-modulation scheme. The baseband signal firstly modulated ratio modulation-color shift keying (CRM-CSK) to broadcast information that can be distinguished camera. Next it, gray level modulation (GLM) utilized generate CRM symbols with...
Square and circular light source layouts conventionally employed in visible communication (VLC) systems suffer from blind spots received signal nonuniformity as well large power fluctuations the middle of room. To address these shortcomings, we use cross square annulus conjunction with cross-fertilize particle swarm optimization algorithm to improve VLC system performance. The distribution unit area (RPUA), signal-to-noise ratio (SNR), bit error rate (BER) performance were simulated...
Visible light communication (VLC) which realizes data transmission and universal illumination simultaneously has attracted much attention recently. However, the rate of VLC remains low due to bandwidth performance LEDs inter-symbol interference (ISI). Therefore, a hybrid approach using pulse amplitude modulation width in conjunction with an artificial neural network (ANN) equalizer is proposed, can theoretically increase by 4 times compared traditional way, provide variable brightness...