Pub Date : 1997-09-09DOI: 10.1109/ICICS.1997.652127
H. Demirel, T. Clarke, Peter Y. K. Cheung
In conventional image-based feature detection a time consuming pre-processing step is required to manually segment the training features from the unsegmented face images. We present a novel method of using automatically segmented facial image data for facial feature detection. A quality measure is defined to identify those image data from a large training set that are better to describe the feature. The best quality subset is then extracted and used to train the feature detector. The detection performance obtained by the automatically segmented data set after refinement is almost as high as that obtained by the feature detector trained by a manually segmented set.
{"title":"Automatic segmentation of training set for facial feature detection","authors":"H. Demirel, T. Clarke, Peter Y. K. Cheung","doi":"10.1109/ICICS.1997.652127","DOIUrl":"https://doi.org/10.1109/ICICS.1997.652127","url":null,"abstract":"In conventional image-based feature detection a time consuming pre-processing step is required to manually segment the training features from the unsegmented face images. We present a novel method of using automatically segmented facial image data for facial feature detection. A quality measure is defined to identify those image data from a large training set that are better to describe the feature. The best quality subset is then extracted and used to train the feature detector. The detection performance obtained by the automatically segmented data set after refinement is almost as high as that obtained by the feature detector trained by a manually segmented set.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"117 1","pages":"984-988 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87088677","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}
Pub Date : 1997-09-09DOI: 10.1109/ICICS.1997.647161
Y. Jeong, J.S. Kim, Y.G. Bahg
WLL is an access system that uses a wireless link to connect subscribers to their local exchange in place of conventional copper cable. We propose a common air interface for the wideband CDMA WLL system. This paper describes the design and implementation of a digital receiver ASIC for the proposed wideband CDMA WLL system. The proposed reverse link transmitter structure is described. Then the design specification of the reverse link receiver is described. Operation of the implemented reverse link receiver ASIC is verified by system timing simulation. The total gate number of the code acquisition module, code tracking and data demodulation module, and Viterbi decoder module is about 150,000. For the purpose of ASIC implementation, 0.6 /spl mu/m CMOS technology is used. The implemented reverse link receiver ASIC can operate at clock frequencies up to 65.536 MHz.
{"title":"Wideband CDMA receiver for WLL system","authors":"Y. Jeong, J.S. Kim, Y.G. Bahg","doi":"10.1109/ICICS.1997.647161","DOIUrl":"https://doi.org/10.1109/ICICS.1997.647161","url":null,"abstract":"WLL is an access system that uses a wireless link to connect subscribers to their local exchange in place of conventional copper cable. We propose a common air interface for the wideband CDMA WLL system. This paper describes the design and implementation of a digital receiver ASIC for the proposed wideband CDMA WLL system. The proposed reverse link transmitter structure is described. Then the design specification of the reverse link receiver is described. Operation of the implemented reverse link receiver ASIC is verified by system timing simulation. The total gate number of the code acquisition module, code tracking and data demodulation module, and Viterbi decoder module is about 150,000. For the purpose of ASIC implementation, 0.6 /spl mu/m CMOS technology is used. The implemented reverse link receiver ASIC can operate at clock frequencies up to 65.536 MHz.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"47 1","pages":"560-563 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86472577","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}
Pub Date : 1997-09-09DOI: 10.1109/ICICS.1997.647162
Jinho Choi, J. Roh
We consider both multiuser detection and antenna arrays. For the multiuser detection, we use the decorrelating detector. It is shown that the resulting system is less affected by strong interferences and has the near-far resistance. Furthermore, it is observed that the decorrelating detector does not depend on the spatial cross-correlation. In the conventional detector, however, the performance degradation from the spatial cross-correlation is observed.
{"title":"Beamforming for the decorrelating detector in synchronous CDMA systems","authors":"Jinho Choi, J. Roh","doi":"10.1109/ICICS.1997.647162","DOIUrl":"https://doi.org/10.1109/ICICS.1997.647162","url":null,"abstract":"We consider both multiuser detection and antenna arrays. For the multiuser detection, we use the decorrelating detector. It is shown that the resulting system is less affected by strong interferences and has the near-far resistance. Furthermore, it is observed that the decorrelating detector does not depend on the spatial cross-correlation. In the conventional detector, however, the performance degradation from the spatial cross-correlation is observed.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"1 1","pages":"564-568 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87210096","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}
Pub Date : 1997-09-09DOI: 10.1109/ICICS.1997.652078
F. Ahmed, A. Darus, Z. Yusoff, M. Haque
Free metallic particles, inside gas insulated switchgear (GIS) apparatus are considered hazardous to the insulation system, can be detected using acoustic sensors placed on the enclosure. From acoustic measurements, it is rather easy to determine the partial discharge pulses caused by loose or fixed particles. One can readily recognise the motion modes of the free particles by studying the acoustic signal. This paper presents the analysis of free metallic particle motion modes in GIS apparatus from acoustic measurements. The parameters such as maximum acoustic amplitude, number of acoustic pulses, mean value of maximum amplitude of 10 measurements, number of pulses which exceed the specified % of maximum amplitude characterising partial discharge activity of Al as well as Cu particles of different shapes are investigated.
{"title":"Characterisation of acoustic signal and pattern recognition of free moving metallic particle motion modes in GIS","authors":"F. Ahmed, A. Darus, Z. Yusoff, M. Haque","doi":"10.1109/ICICS.1997.652078","DOIUrl":"https://doi.org/10.1109/ICICS.1997.652078","url":null,"abstract":"Free metallic particles, inside gas insulated switchgear (GIS) apparatus are considered hazardous to the insulation system, can be detected using acoustic sensors placed on the enclosure. From acoustic measurements, it is rather easy to determine the partial discharge pulses caused by loose or fixed particles. One can readily recognise the motion modes of the free particles by studying the acoustic signal. This paper presents the analysis of free metallic particle motion modes in GIS apparatus from acoustic measurements. The parameters such as maximum acoustic amplitude, number of acoustic pulses, mean value of maximum amplitude of 10 measurements, number of pulses which exceed the specified % of maximum amplitude characterising partial discharge activity of Al as well as Cu particles of different shapes are investigated.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"65 1","pages":"750-753 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87711282","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}
Pub Date : 1997-09-09DOI: 10.1109/ICICS.1997.647075
Yong-Hoon Kim, Chang-Woo Yoon, Mi-Jung Yang, Dae-Ung Kim
In order to use Internet services, the user should subscribe to an Internet service provider and content provider (CP). This procedure requires a monthly fixed sum of money for using the Internet and CP; this is a barrier to suppress the growth of Internet users. To promote high quality commercial Internet services, we must simplify the users' subscribing procedures and charging system. We designed and implemented the Web InfoShop Node (WiN) System. The WiN system has an open architecture for accessing the Internet and CP resources. The users of the WiN system can access the Internet and CP resources without a regular subscribing procedure. Additionally the WiN system can provide various services such as authentication resolution, billing agency and filtering of resources. In this paper, we describe the system configuration, the services provided, and the communication protocols of the WiN system.
{"title":"Open architecture of accessing Internet and its content providers for the Web InfoShop Node","authors":"Yong-Hoon Kim, Chang-Woo Yoon, Mi-Jung Yang, Dae-Ung Kim","doi":"10.1109/ICICS.1997.647075","DOIUrl":"https://doi.org/10.1109/ICICS.1997.647075","url":null,"abstract":"In order to use Internet services, the user should subscribe to an Internet service provider and content provider (CP). This procedure requires a monthly fixed sum of money for using the Internet and CP; this is a barrier to suppress the growth of Internet users. To promote high quality commercial Internet services, we must simplify the users' subscribing procedures and charging system. We designed and implemented the Web InfoShop Node (WiN) System. The WiN system has an open architecture for accessing the Internet and CP resources. The users of the WiN system can access the Internet and CP resources without a regular subscribing procedure. Additionally the WiN system can provide various services such as authentication resolution, billing agency and filtering of resources. In this paper, we describe the system configuration, the services provided, and the communication protocols of the WiN system.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"18 1","pages":"143-147 vol.1"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88773880","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}
Pub Date : 1997-09-09DOI: 10.1109/ICICS.1997.652202
Yang Qi-fang, Yu Chong-xiu, Hsu Da-Xiong
The paper proposes a novel optical code-division multiple access (OCDMA) system based on a wavelength-converter. The designed system does not need high-speed short optical pulse and fiber taps. It integrates the advantages of the OCDMA and OWDMA techniques.
{"title":"A novel OCDMA based on wavelength-converter","authors":"Yang Qi-fang, Yu Chong-xiu, Hsu Da-Xiong","doi":"10.1109/ICICS.1997.652202","DOIUrl":"https://doi.org/10.1109/ICICS.1997.652202","url":null,"abstract":"The paper proposes a novel optical code-division multiple access (OCDMA) system based on a wavelength-converter. The designed system does not need high-speed short optical pulse and fiber taps. It integrates the advantages of the OCDMA and OWDMA techniques.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"25 1","pages":"1319-1321 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88992988","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}
Pub Date : 1997-09-09DOI: 10.1109/ICICS.1997.652239
B. Barkat, B. Boashash, A. Zoubir
The polynomial Wigner-Ville distribution was designed as an optimal tool for characterising the spectral contents of a signal whose phase is a polynomial of a certain order. In this contribution, the peak of the polynomial Wigner-Ville distribution is used to estimate the instantaneous frequency of a polynomial phase signal. A general expression for the asymptotic variance is derived for the estimator, and a statistical comparison with a parametric method for estimating the instantaneous frequency, using the high-order ambiguity function, is established.
{"title":"A performance analysis of polynomial FM signals","authors":"B. Barkat, B. Boashash, A. Zoubir","doi":"10.1109/ICICS.1997.652239","DOIUrl":"https://doi.org/10.1109/ICICS.1997.652239","url":null,"abstract":"The polynomial Wigner-Ville distribution was designed as an optimal tool for characterising the spectral contents of a signal whose phase is a polynomial of a certain order. In this contribution, the peak of the polynomial Wigner-Ville distribution is used to estimate the instantaneous frequency of a polynomial phase signal. A general expression for the asymptotic variance is derived for the estimator, and a statistical comparison with a parametric method for estimating the instantaneous frequency, using the high-order ambiguity function, is established.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"16 1","pages":"1484-1488 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85136099","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}
Pub Date : 1997-09-09DOI: 10.1109/ICICS.1997.652119
Ig-Jae Kim, Je-Ho Lee, Yong-Moo Kwon, Sang-Hui Park
We have proposed a composite feature measure, which combines the color and shape features of an image. We improved the retrieval performance by using color features generated from efficient color quantization and considered the spatial correlation with the histogram matrix matching method. We also supplemented the color information using shape information with the improved moment invariants. We have tested our technique on an image database consisting of 200 actual trademark images. We showed that our method is more robust than previous method under various situations such as rotation images, translation images, noise added images, gamma corrected images and so on. The retrieval efficiency is found to be very high and the experimental results are promising for practical applications.
{"title":"Content-based image retrieval method using color and shape features","authors":"Ig-Jae Kim, Je-Ho Lee, Yong-Moo Kwon, Sang-Hui Park","doi":"10.1109/ICICS.1997.652119","DOIUrl":"https://doi.org/10.1109/ICICS.1997.652119","url":null,"abstract":"We have proposed a composite feature measure, which combines the color and shape features of an image. We improved the retrieval performance by using color features generated from efficient color quantization and considered the spatial correlation with the histogram matrix matching method. We also supplemented the color information using shape information with the improved moment invariants. We have tested our technique on an image database consisting of 200 actual trademark images. We showed that our method is more robust than previous method under various situations such as rotation images, translation images, noise added images, gamma corrected images and so on. The retrieval efficiency is found to be very high and the experimental results are promising for practical applications.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"38 1","pages":"948-952 vol.2"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87459826","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}
The layer 2 compression scheme of MPEG audio coding is a very common audio coding standard for CD quality audio (music). However, its encoding process requires a large amount of computations. In this paper, we propose some optimization techniques to make the encoding program much faster while allowing to impair the audio quality a little. In order to measure how much quality loss, we define criteria to quantify the quality loss rate of an encoded audio stream. From the definition, we can say that the encoder encoding streams with a quality loss rate equivalently wastes a number of bits, if the encoder that completely conforms to the layer 2 standard can save the same number of bits while keeping the same quality loss rate. In our experiments, we optimize the layer 2 compression programs such that audio streams can be encoded real time on a Pentium Pro 180 with only 0.0003% quality loss and equivalently 1.5% bits wasted and on a Pentium 180 with only 0.0009% quality loss and equivalently 4% bits wasted.
MPEG音频编码的第二层压缩方案是CD质量音频(音乐)的一种非常常用的音频编码标准。但是，其编码过程需要大量的计算量。在本文中，我们提出了一些优化技术，以使编码程序更快，同时允许损害一点音频质量。为了测量音质损失有多大，我们定义了一个标准来量化编码音频流的音质损失率。由定义可知，如果完全符合第二层标准的编码器可以在保持相同的质量损失率的情况下节省相同的比特数，那么编码器编码具有质量损失率的流相当于浪费了若干比特。在我们的实验中，我们优化了第2层压缩程序，使得音频流可以在Pentium Pro 180上实时编码，只有0.0003%的质量损失和相当于1.5%的比特浪费，而在Pentium 180上只有0.0009%的质量损失和相当于4%的比特浪费。
{"title":"Optimization and quality measurement for the layer 2 compression scheme of MPEG audio coding","authors":"Chien-Hua Hsu, I-Chen Wu, Ling-yuan Kao, Jin-Fu Ueng","doi":"10.1109/ICICS.1997.652248","DOIUrl":"https://doi.org/10.1109/ICICS.1997.652248","url":null,"abstract":"The layer 2 compression scheme of MPEG audio coding is a very common audio coding standard for CD quality audio (music). However, its encoding process requires a large amount of computations. In this paper, we propose some optimization techniques to make the encoding program much faster while allowing to impair the audio quality a little. In order to measure how much quality loss, we define criteria to quantify the quality loss rate of an encoded audio stream. From the definition, we can say that the encoder encoding streams with a quality loss rate equivalently wastes a number of bits, if the encoder that completely conforms to the layer 2 standard can save the same number of bits while keeping the same quality loss rate. In our experiments, we optimize the layer 2 compression programs such that audio streams can be encoded real time on a Pentium Pro 180 with only 0.0003% quality loss and equivalently 1.5% bits wasted and on a Pentium 180 with only 0.0009% quality loss and equivalently 4% bits wasted.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"21 1","pages":"1522-1526 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84283208","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}
Pub Date : 1997-09-09DOI: 10.1109/ICICS.1997.652198
K. Ichige, K. Ueda, M. Iwaki, R. Ishii
This paper presents an accurate estimation formula for the minimum filter length of optimum (the minimax criterion based) FIR low-pass digital filters when ripples in passband and those in stopband are identical. Two estimation formulae have been already proposed, but they have some problems which lead to wrong estimation. Discussing the problems based on both experimental results and theoretical considerations, we propose a new estimation formula. The accuracy of the proposed formula, is evaluated for some design examples and compared with that of the conventional formulae.
{"title":"A new estimation formula for minimum filter length of optimum FIR low-pass digital filters","authors":"K. Ichige, K. Ueda, M. Iwaki, R. Ishii","doi":"10.1109/ICICS.1997.652198","DOIUrl":"https://doi.org/10.1109/ICICS.1997.652198","url":null,"abstract":"This paper presents an accurate estimation formula for the minimum filter length of optimum (the minimax criterion based) FIR low-pass digital filters when ripples in passband and those in stopband are identical. Two estimation formulae have been already proposed, but they have some problems which lead to wrong estimation. Discussing the problems based on both experimental results and theoretical considerations, we propose a new estimation formula. The accuracy of the proposed formula, is evaluated for some design examples and compared with that of the conventional formulae.","PeriodicalId":71361,"journal":{"name":"信息通信技术","volume":"10 1","pages":"1303-1307 vol.3"},"PeriodicalIF":0.0,"publicationDate":"1997-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87135429","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}
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