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A direct sequence spread spectrum (DSSS) signal is commonly used in inter-satellite link (ISL) in navigation constellation; however, acquisition is a challenging task because of large-scale relative movement between satellites. In general, a signal search (carrier frequency and code phase) is implemented using two-dimensional partitioned fast Fourier transforms (FFTs), which is limited by the memory...
Level set methods have been extensively used in contour recognition and image segmentation. The traditional level set methods require to initialize the level set function regularly and are strongly dependent on initial contour position thus there are many problems about the methods. Considering those problems, this article proposed a new level set method to draw geometric active contour self-adaptively...
In this paper, the forward and inverse kinematics of a robot manipulator named RV-M1 are analyzed. The forward kinematic model is based on the DH parameters, and the inverse one is derived in closed form. Then, the interactive simulation system is established using MATLAB software which is one of the most used platforms for the modeling and simulation of robot systems. Finally, the simulation results...
The number of elderly people living alone have increased over the last years and fall is one of major risks that threaten their lives. Computer vision is one of the accurate solution for fall detection. In this paper, we propose a new method for fall detection using depth camera. This method combines human shape analysis, head tracking and center of mass detection by exploiting the advantages of Kinect...
In the last decades, Robust Principal Component Analysis (PCA) has been drawn much attention in the image processing, computer vision and machine learning communities and various robust PCA methods have been developed. This paper introduces a new generalized robust PCA with emphasizing on ℓ2, 1-norm minimization on loss function. The ℓ2, 1-norm instead of Frobenius norms based loss function is robust...
This paper examines performances of an independent Speaker Identification System (SIS) based on a template model using a Vector Quantization (VQ) method. Template model is characterized by the implementation platform based on a comparison process where the speaker model with the smallest distortion score is identified. In order to analyze the decision of the system and its confidence, a thresholding...
In side channel attacks (SCA), noise has been a hot topic for affecting the quality of obtained observations. In this paper, we propose a kind of improved wavelet transform denoising method based on singular spectral analysis (SSA) and detrended fluctuation analysis (DFA). Principal signal component in SSA can be selected by DFA adaptively, and residual part can be denoised by wavelet transform to...
Object tracking and state estimation in outdoor scenes is crucial for autonomous vehicle research. For well fulfilling this mission, there are three key challenges should be overcome-obstacles detection and segmentation, ego-motion estimation and object tracking. In our method, 2D Gaussian process algorithm based on local samples is presented here for obstacle area detection. Then, obstacle area is...
The detection of heartbeat is an important and challenging issue for health care. This work proposes to estimate the QRS complex parameters based on the maximum-likelihood (ML) principle. To this goal, a new signal model and its Bayesian framework are studied. Detectors or estimators based on the Bayesian framework are considered to be optimal in the statistical signal processing point of view. To...
The motion dynamics and geometric information are considered to be one of the most useful features for infrared (IR) targets recognition. Especially for the exo-atmospheric target, when a target undergoes micro-motion dynamics in the outer space, such as mechanical vibrations or rotations, it would induce amplitude modulations on signature of target projected area along the Line-of-Sight (LOS) of...
Digital down-conversion technology based on the structure of bandpass sampling is one of the key technologies of software radio receiving system. While the traditional digital mixing orthogonal demodulation using multiplier, to a certain extent, increase the computational complexity. This paper proposes a kind of digital down-conversion design based on polyphase filtering structure, effectively reducing...
In short range ultrasonic measurement systems, the blind area of the measurement limit the application of the low cost ultrasonic transducers. In a double transducer measurement system, when impulses are loaded to transmitter with reflection and refraction of sonic, the receiver nearby will receive echoes immediately, which will leads to a period of time that can't be measured. If an object is near...
Daytime star sensor is an attitude measurement instrument that satisfies navigation requirements of various near surface platforms (aircraft, missiles, ships, etc.) with the ability of operating diurnally under strong background radiation. As an important basis for studying star pattern identification algorithm, daytime star images usually can't be obtained in real-time. Software star image simulation...
Nowadays the weak signal detection technology is necessary in scientific research field, in which the phase-locked amplifying technology is widely used in the field of weak signal detection because it can meet the requirements of high speed and high accuracy. System Generator software is adopted as a tool since System Generator can make the design more conveniently and efficiently. The design of each...
In this paper, we design and implement an effective framework for interaction simulation based on real shadows and virtual shadows. Within the specified depth range, we firstly identify different physical objects with the method of HSV. And then in order to get the position of interaction tool, we use central moment to find the centroid of the physical object. In addition, the gesture recognition...
We design a low energy Bluetooth (BLE) device including reference-tag-based indoor position algorithm to solve different situations including location determining, route guideline and tracking in this study. It can not only help the visitor or patient to understand the position but also provide a system for medical staff to monitor the safety of patients and new born babies in hospital. This device...
CCTV-based surveillance networks are widely used for security in public places. An important installation problem is to assign a camera schedule with which the system can choose which camera to record its video frames to storage at a certain time. Because of the resource constrained and bandwidth limitation, only a subset of raw video frames can be recorded for a camera. For security concerns, it...
The research aims to detect the onset of drowsiness in drivers, while the vehicle is in motion. Detection is done by continuously looking out for symptoms of drowsiness, while considering both physiological and physical signs. Physiological factors include core body temperature and pulse rate. Both of these parameters will decrease during the onset of drowsiness. These are monitored by using somatic...
Wearable device with an ego-centric camera would be the next generation device for human-computer interaction such as robot control. Hand gesture is a natural way of ego-centric human-computer interaction. In this paper, we present an ego-centric multi-stage hand gesture analysis pipeline for robot control which works robustly in the unconstrained environment with varying luminance. In particular,...
When the signal-to-noise ratio (SNR) is reduced in case of track-before-detect (TBD) for weak target detection, the TBD algorithm based on Gaussian mixture probability hypothesis density (GM-PHD) filter cannot estimate the number or status of targets accurately. In order to solve this problem, a TBD algorithm based on GM-PHD smoothing filter (SGM-PHD-TBD) is proposed. Within the framework of TBD standard...
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