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With the advent of large numbers of data and a large number of samples, the traditional support vector machine algorithm is not applicable because of it's too much memory overhead and time overhead. Traditional parallel SVM based on MapReduce is to separate the train data into multiple sub-training sets on MapReduce-based model, these sub-datasets are trained by SVM, and then, get the support vectors...
The system combines the wireless communication technology and medical sensor detection technology, to realize the remote medical monitoring of multiple physiological parameters. As the basis of the Android platform, the mobile health platform construct a health report with physical examination, health guidance for every members in family. After using the corresponding physiological data acquisition...
The results of minimum variance (MVDR) algorithm map to the signal subspace to get the weighted coefficients based on feature subspace theory, In the low SNR environment, there will be the main lobe offset, waveform distortion, serious decline in the performance of beamforming. This paper puts forward an improved method for the emergence of this kind of situation. Using the principle of correlation...
In this paper, we describe the basic principle of the wide dynamic range compression algorithm, the hardware structure of digital hearing aids, and the structure of core and peripheral devices of DSP5535. On this basis, through the introduction of the realization of the wide dynamic range compression algorithm, this paper describes how to optimize the algorithm in hearing aid platform based on the...
The Least Mean Square (LMS)algorithm is the most basic adaptive echo cancellation algorithm. However, the fixed step size of LMS does not solve the contradiction between the convergence rate and the steady state error which are all used for judging the performance of algorithm. This paper references the Sigmoid function and creates the nonlinear relation between estimated error e(n) and variable step...
In the speech enhancement algorithm, adding Mel-frequency domain processing will make the processed more in line with the characteristics of human ears. The implementation of this approach is based on the Wiener filter, which will be improved obviously of the sound quality, but will keep too much background noise. For this reason the output SNR(signal-to-noise ratio)reduced. At the same time, we all...
This paper has designed and implemented a video surveillance system based on the smart Android terminal equipment. This system consists of two parts, including the server and the client. The server is responsible for the video acquisition and the H.264 video encoding. The video transmission uses RTP protocol. The client is responsible for receiving data, and completing the decoding and playback. Because...
We realize the function of image acquisition and video data transmission which is required in video communication by developing an Android application. We acquire the video data through our camera and divide them into NAL units in a background thread. We parse the local MP4 file in accordance with the H.264 standard to get the parameters sets, which is transmitted before the real video data and useful...
In this project, an air conditioning remote control system was implemented with the STC90C516RD+ micro control unit (MCU) as the control core. Through Global System for Mobile Communications (GSM), users send the control instructions to the system by short messages as the information carrier. The remote communication hardware part is mainly composed of SIM900A and subscriber identity module (SIM)...
Moving objects detection from a video sequence is a fundamental and critical work in many computer-vision applications. A widely utilized strategy is to implement background subtraction method, aiming to classify moving objects from video sequences based on the background model. To address the false classification, a new background modeling method is presented and a new foreground object detection...
The main research content of this article is based on fingerprint method of AP selection and location estimation algorithm. We introduce RANSAC algorithm used in image processing art to AP selection in the online stage for external detection. It can filter to remove the APs impacted by environmental variation, not only reduces the amount of calculation but also improves the positioning accuracy. Aiming...
The designing based on Adaboost algorithm not only achieved the nighttime pedestrian detection module of auxiliary driving system, but also realized the system optimization on issues of low detection speed and precision. In this design, variable step length and partition scanning track methods are used to improve the detection speed and variance normalization approach was applied to eliminate the...
An algorithm is proposed for automatic geometric correction based on feedback of camera for multi-projector display system to address the problems exist in interactive manual geometric correction. The method is implemented in two steps. The first step performs an approximate correction which does not involve manual interaction. This step establishes geometric relations involving the screen space,...
In this paper, we present an effective low-complexity algorithm for onboard lossless compression of hyperspectral images, the algorithm based on hybrid prediction. It is suitable to spacecraft onboard implementation as having much less complexity. Specifically, the proposed algorithm is mainly composed of three parts to compress the hyperspectral images. First of all, a three-dimensional (3-D) predictor,...
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