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The accurate measurement of the pulverized-coal concentration in the powder-transmission pipe of the coal pulverizing system of thermal power plant can effectively reflect the operation efficiency of the system, and the preprocessing of several key variables, that are adopted to represent the pulverized-coal concentration, is an important step. In this paper, we propose a preprocessing method based...
Aim at the detecting one-dimensional bar-code in nowdays of real - time need, designing a low cost and moderate function image processing system. The acquisition and processing of image are the key components of the system. The system uses S3C2440, which installs Linux, as the core with circuit realize image processing function, multi - communication interface constitute image transmission channels...
With the growing capacity of computer vision technology, there is more interest being directed towards the automatic recognition of sign language based solely on image sequences or videos. In this paper a well-built segmentation process is developed which helps to promote a better vision-based sign language recognition system. Segmentation is a challenging problem, and its accuracy implies more in...
3D reconstruction based on high-level features, such as line and plane, is an important development trend in Digital Photogrammetry and Computer Vision. A novel method for extracting stratight line is presented, which can be illustrated as follows. Firstly, image is preprocessed by Wallis filtering that is used to enhance the image contrast and reduce the noise, so it is easy to extract more lines...
The digital watermarks have recently been recognized as a solution for protecting the copyright of the digital multimedia. In this paper a novel DWT-based video watermarking algorithm is proposed based on a three-level DWT using Haar filter which is robust against geometric distortions such as Downscaling, Cropping, and Rotation. It is also robust against Image processing attacks such as low pass...
As today's digital cameras contain millions of image sensors, it is highly probable that the image sensors will contain a few defective pixels due to errors in the fabrication process. While these bad pixels would normally be mapped out in the manufacturing process, more defective pixels, known as hot pixels, could appear over time with camera usage. Since some hot pixels can still function at normal...
To reduce the impact on characteristic of FOG (fiber optic gyro) SINS(strapdown inertial navigation system) from vibration, a new anti-vibration scheme based on improvement of mechanical structure, craft of optics and signal processing is proposed. Using finite element theory, the frameworkpsilas resonance frequency of FOG is studied and enhanced to adapt the surrounding; Vibration modulation mechanism...
Signals output from the gyros usually contain turbulent noise, which comes down the signal accuracy and lowers the systemspsila function. So denoising is necessary. an algorithm, based on three-layer wavelet packet transform of semisoft threshold, was applied to process the gyropsilas state signal. The decomposition coefficient of each node was got from the decomposition of third-layer wavelet packet...
In this paper, analysis and design of a frequency dependent negative resistance (FDNR) based noise-shaping elliptic blocker filtering technique is presented. Due to its noise shaping characteristics, the circuit can provide a third-order low-pass elliptic response with an input referred noise density of 7.2nV/sqrtHz. The proposed circuit relaxes the noise-linearity trade-off a receiver chain by providing...
As tire performance specifications become more stringent, tire manufacturers are facing the challenge to develop accurate measuring device for their products. Runout is a standard test performed to determine whether a tire ldquoqualifiesrdquo. Unfortunately, tires have letters, trademarks and pin vents on their sidewalls, which can bring a lot of trouble to the runout data analysis. In this paper...
Photon tracing and density estimation are well established techniques in global illumination computation and rendering of high-quality animation sequences. Using traditional density estimation techniques it is difficult to remove stochastic noise inherent for photon-based methods while avoiding overblurring lighting details. In this paper we investigate the use of bilateral filtering for lighting...
Because of the frequent alterations of ECG during exercise testing, processing and automatic analysis of ECG signal are difficult. In order to obtain high quality signals, we pre-processed the signals using a modelled P wave which allows the recognition of the P-wave by the least-square method and the estimation and elimination of the respiratory artefact. High frequency noise was reduced by a temporal...
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