2008 International Symposium on Communications and Information Technologies最新文献_第5页

Temperature-Insensitive Current-Mode Square-Rooting Circuit Using Only Two CDTAs 仅使用两个cdta的温度不敏感电流模式平方根电路

2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700155

P. Mongkolwai, D. Prasertsom, W. Tangsrirat, W. Surakampontorn

引用次数: 1

Wideband and Sinusoidal Noise Reduction Based on Adaptive Filter with Variable Step Size 基于变步长自适应滤波器的宽带正弦降噪

2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700188

N. Sasaoka, K. Shimada, Y. Itoh, K. Fujii

引用次数: 1

Study on Image Quality for Medical Ultrasonic Echo Image Compression by Wavelet Transform 基于小波变换的医学超声回波图像压缩图像质量研究

2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700174

V. Khieovongphachanh, K. Hamamoto, S. Kondo

{"title":"Study on Image Quality for Medical Ultrasonic Echo Image Compression by Wavelet Transform","authors":"V. Khieovongphachanh, K. Hamamoto, S. Kondo","doi":"10.1109/ISCIT.2008.4700174","DOIUrl":"https://doi.org/10.1109/ISCIT.2008.4700174","url":null,"abstract":"JPEG2000 is a new standard for image compression, which is based on wavelet transform and incorporated into DICOM (digital imaging and communication in medicine). In JPEG2000, there are two quantization methods, the scalar derived quantization (SDQ) and the scalar expounded quantization (SEQ). In this work, we use three optimization methods of quantization step, which are SDQ, SEQ determined by arithmetic average method and SEQ determined by genetic algorithm. Evaluation of image quality is comparison between peak signal to noise ratio (PSNR) and standard deviation, which one is correlation with the results of subjective assessment. PSNR is traditional objective assessment to measure image quality and standard deviation is new criterion. Subjective assessment is evaluated by ultrasonographers, which is the most important for medical image. The results show that standard deviation match to subjective assessment. Sometime compressed image loses important information for diagnosis in spite of high PSNR. Therefore, PSNR does not correlate well with the results of subjective assessment. Our purpose is to use the new criterion instead of PSNR that standard deviation is better than PSNR.","PeriodicalId":215340,"journal":{"name":"2008 International Symposium on Communications and Information Technologies","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134213347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Even Order Biquad Digital Filter Design Using Pascal Matrix 用Pascal矩阵设计偶阶双置数字滤波器

2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700207

P. Srisangngam, S. Chivapreecha, K. Dejhan

引用次数: 0

Adaptive Line Enhancer for Time Delay Estimation of Ultrasonic Echoes 用于超声回波时延估计的自适应线路增强器

2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700215

Chayanin Tiengwattanatum, Nakamura Naoyukit, Tetsuya Shimamurat

引用次数: 2

Current-Mode Quadrature Oscillator Using Translinear Current Conveyors 利用横线电流传送带的电流模式正交振荡器

2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700181

B. Knobnob, M. Kunmgern, K. Dejhan

引用次数: 9

Accurate Tunable Current-mirror and its Applications 精确可调电流镜及其应用

2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700154

M. Somdunyakanok, T. Pattanathadapong, P. Prommee

{"title":"Accurate Tunable Current-mirror and its Applications","authors":"M. Somdunyakanok, T. Pattanathadapong, P. Prommee","doi":"10.1109/ISCIT.2008.4700154","DOIUrl":"https://doi.org/10.1109/ISCIT.2008.4700154","url":null,"abstract":"This paper proposes an accurate electronically tunable current-mirror circuit based on translinear type-A (polarities alternative) topology. This circuit is realized by only 6 transistors with BJT technology. A shunt-feedback buffer principle is used in order to regulate its emitter voltage of translinear part. For current mirror behavior, output and input currents are identical with a small error. Current-gain can be obtained by adjusting the ratio of the 2 particular current sources. This proposed circuit is using only 6 transistors for the simple structure. The analysis of input, output resistance and current-gain are depicted. An extra transistor is added for maintained the transfer minimum error which is also proposed. The constant bandwidth more than 40 MHz of various current-gains can be obtained. From current output mathematic function, several applications such as current multiplier, current divider and tunable current mirror are certainly performed. Other applications are raised to confirm realistic applicable including squaring and square-rooting circuits. All characteristics and performances are carried out by PSpice for confirm their well operations.","PeriodicalId":215340,"journal":{"name":"2008 International Symposium on Communications and Information Technologies","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114634324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

High-Input Impedance Voltage-Mode Multifunction Filter with Three-Input Single-Output Based on Simple CMOS OTAs 基于简单CMOS ota的高输入阻抗电压型三输入单输出多功能滤波器

2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700228

M. Kumngern, M. Somdunyakanok, P. Prommee

引用次数: 15

An FFT-Based Technique and Best-first Search for Image Registration 基于fft的图像配准技术及最佳优先搜索

2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700214

Olan Samritjiarapon, O. Chitsobhuk

{"title":"An FFT-Based Technique and Best-first Search for Image Registration","authors":"Olan Samritjiarapon, O. Chitsobhuk","doi":"10.1109/ISCIT.2008.4700214","DOIUrl":"https://doi.org/10.1109/ISCIT.2008.4700214","url":null,"abstract":"The image registration is a fundamental task in image processing used to match two or more pictures taken, for example, at different time, from different sensors, or from different viewpoints. One of the major challenges related to image registration is the estimation of large motion, when input images contain small overlapped area. Common image registration using the search algorithm can accurately finds large motion but requires high computation cost due to large search space. Fourier-based technique is an alternative approach since it can rapidly achieve the registration results through its FFT algorithm. However, only Fourier-based technique cannot produce the correct results in the case of large translation. Thus, this paper presents a Fourier-based technique cooperated with best-first search algorithm to analyze the correct translation between two input images. The Fourier-based technique is used to estimate the candidate translations to decrease searching space while best-first search algorithm is used to further search for the correct translation. The proposed technique can estimate large translations, scalings, and rotations in images by an extension of well-known phase correlation technique. The experimental results using various image details show the accuracy of the proposed technique to detect large translations compared to the other techniques in frequency domain.","PeriodicalId":215340,"journal":{"name":"2008 International Symposium on Communications and Information Technologies","volume":"210 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132267499","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Affine Invariant Shape Recognition Based on Multi-Level of Barycenter Contour 基于多层次重心轮廓的仿射不变形状识别

2008 International Symposium on Communications and Information Technologies Pub Date : 2008-12-08 DOI: 10.1109/ISCIT.2008.4700171

K. Thoum, Y. Kitjaidure, S. Kondo

引用次数: 7