Pub Date : 2000-02-22DOI: 10.1109/NRSC.2000.838964
M. El-Saba
On the basis of the hydrodynamic model the transport of hot carriers in the p-i-n diode is investigated over a large scale of reverse-bias voltage. the electric field distribution and the total current density which we obtained by both the drift-diffusion model and the hydrodynamic model are approximately identical before the breakdown region. So, the electric field distribution is not severely perturbed by the hot-carrier effects before the onset of the breakdown mechanism. However, the solutions of the minority carrier distribution and the minority carrier current density are significantly different around the edges of space-charge regions due to the carrier-temperature gradients. At sufficient reverse bias, the diffusion of minority carriers (generation in neutral regions) is found to be basically influenced by the carrier-temperature gradient rather than the carrier-concentration gradient as known from the drift-diffusion theory.
{"title":"Influence of carrier-temperature gradients on the transport of hot carriers across semiconductor junctions","authors":"M. El-Saba","doi":"10.1109/NRSC.2000.838964","DOIUrl":"https://doi.org/10.1109/NRSC.2000.838964","url":null,"abstract":"On the basis of the hydrodynamic model the transport of hot carriers in the p-i-n diode is investigated over a large scale of reverse-bias voltage. the electric field distribution and the total current density which we obtained by both the drift-diffusion model and the hydrodynamic model are approximately identical before the breakdown region. So, the electric field distribution is not severely perturbed by the hot-carrier effects before the onset of the breakdown mechanism. However, the solutions of the minority carrier distribution and the minority carrier current density are significantly different around the edges of space-charge regions due to the carrier-temperature gradients. At sufficient reverse bias, the diffusion of minority carriers (generation in neutral regions) is found to be basically influenced by the carrier-temperature gradient rather than the carrier-concentration gradient as known from the drift-diffusion theory.","PeriodicalId":211510,"journal":{"name":"Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121846217","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 : 2000-02-22DOI: 10.1109/NRSC.2000.838847
A. Attiya, E. El-Diwany, A. Shaarawi
The problem of generating an approximate transverse electric (TE) electromagnetic X-wave using a finite circular array of electric dipoles is investigated as an extension of Huygens' aperture solution. A comparison is first made between the dominant term of the time domain far field radiated from an electric dipole and from the elementary point source term in Huygens' formula. The result of this comparison aids in constructing a circular array of electric dipoles for generating an X-wave in free space. Next, the time domain far field radiated due to an electric dipole in free space, and penetrating an air-dielectric interface is evaluated asymptotically for large distances using the saddle point method. Such a far field is used as a basic unit to investigate the behavior of an X-wave generated by an array of dipoles and transmitted inside the dielectric medium through an air-dielectric interface.
{"title":"Generation of an approximate TE electromagnetic X-wave in free space and in a planar layered medium using a finite array of electric dipoles","authors":"A. Attiya, E. El-Diwany, A. Shaarawi","doi":"10.1109/NRSC.2000.838847","DOIUrl":"https://doi.org/10.1109/NRSC.2000.838847","url":null,"abstract":"The problem of generating an approximate transverse electric (TE) electromagnetic X-wave using a finite circular array of electric dipoles is investigated as an extension of Huygens' aperture solution. A comparison is first made between the dominant term of the time domain far field radiated from an electric dipole and from the elementary point source term in Huygens' formula. The result of this comparison aids in constructing a circular array of electric dipoles for generating an X-wave in free space. Next, the time domain far field radiated due to an electric dipole in free space, and penetrating an air-dielectric interface is evaluated asymptotically for large distances using the saddle point method. Such a far field is used as a basic unit to investigate the behavior of an X-wave generated by an array of dipoles and transmitted inside the dielectric medium through an air-dielectric interface.","PeriodicalId":211510,"journal":{"name":"Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126111662","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 : 2000-02-22DOI: 10.1109/NRSC.2000.838947
M. Hadhoud
We introduce a heuristic method for adaptive multichannel restoration of degraded multispectral images when there is limited knowledge about the undegraded images and the noise. The proposed structure aims at reversing the action of the blur function on the image. The system uses number of channels equal to the number of multispectral images L. Each channel consists of L subchannel structures of two parallel adaptive filters with different cutoff frequencies and different DC (zero frequency) gain. The overall structure in each subchannel is equivalent to a filter, which has a combined LP-BP like characteristics. The resulting system has unity gain at the DC, which preserves the image local characteristics. The filter has high gain in the middle (band pass) frequency range, which produces an output image with restored edges. The filter structure gain at the high frequency range is small which reduces the high frequency noise. The adaptive filters are considered for the implementation of the proposed method. This is because they have many desirable properties and able to track the variations in the image characteristics. Multiple channel restoration results are presented and compared with single channel restoration. The results show that the proposed multiple channel restoration is very effective in restoring image details and reduces the noise amplification. Also the fine details are enhanced and preserved.
{"title":"Restoration of multichannel images with limited a priori information using multichannel parallel-like adaptive filters","authors":"M. Hadhoud","doi":"10.1109/NRSC.2000.838947","DOIUrl":"https://doi.org/10.1109/NRSC.2000.838947","url":null,"abstract":"We introduce a heuristic method for adaptive multichannel restoration of degraded multispectral images when there is limited knowledge about the undegraded images and the noise. The proposed structure aims at reversing the action of the blur function on the image. The system uses number of channels equal to the number of multispectral images L. Each channel consists of L subchannel structures of two parallel adaptive filters with different cutoff frequencies and different DC (zero frequency) gain. The overall structure in each subchannel is equivalent to a filter, which has a combined LP-BP like characteristics. The resulting system has unity gain at the DC, which preserves the image local characteristics. The filter has high gain in the middle (band pass) frequency range, which produces an output image with restored edges. The filter structure gain at the high frequency range is small which reduces the high frequency noise. The adaptive filters are considered for the implementation of the proposed method. This is because they have many desirable properties and able to track the variations in the image characteristics. Multiple channel restoration results are presented and compared with single channel restoration. The results show that the proposed multiple channel restoration is very effective in restoring image details and reduces the noise amplification. Also the fine details are enhanced and preserved.","PeriodicalId":211510,"journal":{"name":"Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115868536","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 : 2000-02-22DOI: 10.1109/NRSC.2000.838927
M. Yakout, A. AbdelFattah, A.S. Elbazz
The use of a neural network model to analyze electronic circuits is a promising new technique in the field of circuit analysis. This new technique allows the electronic circuits to be analyzed without the need to solve the physical equations describing the circuit. This paper introduces a novel technique to solve electronic circuits that contain linear and non-linear elements. The non-linear elements are chosen to be PN junction diodes in the forward bias condition at different operating temperatures. The technique is based on the neural network and the genetic algorithm. The neural network is used to model the PN junction diode with the help of the genetic algorithm as a learning tool. Then, the genetic algorithm is used to search the solution space domain to find the proper solutions of the electronic circuits. The proposed technique is faster due to the use of parallel operation from the both neural networks and the genetic algorithm. Moreover, the results are very accurate.
{"title":"Analysis of circuits containing nonlinear elements using neural networks and genetic algorithm","authors":"M. Yakout, A. AbdelFattah, A.S. Elbazz","doi":"10.1109/NRSC.2000.838927","DOIUrl":"https://doi.org/10.1109/NRSC.2000.838927","url":null,"abstract":"The use of a neural network model to analyze electronic circuits is a promising new technique in the field of circuit analysis. This new technique allows the electronic circuits to be analyzed without the need to solve the physical equations describing the circuit. This paper introduces a novel technique to solve electronic circuits that contain linear and non-linear elements. The non-linear elements are chosen to be PN junction diodes in the forward bias condition at different operating temperatures. The technique is based on the neural network and the genetic algorithm. The neural network is used to model the PN junction diode with the help of the genetic algorithm as a learning tool. Then, the genetic algorithm is used to search the solution space domain to find the proper solutions of the electronic circuits. The proposed technique is faster due to the use of parallel operation from the both neural networks and the genetic algorithm. Moreover, the results are very accurate.","PeriodicalId":211510,"journal":{"name":"Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113958633","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 : 2000-02-22DOI: 10.1109/NRSC.2000.838840
A. Allam
The paper presents the analysis for plane wave scattering from a grounded chiral substrate that is loaded by an array of square patches for the sake of minimizing the radar cross section (RCS) for the equipment covered by them. The analysis includes a chiral substrate with different electromagnetic parameters. It shows moderate frequency bands of good absorption for the structures presented.
{"title":"Chiral absorbing material","authors":"A. Allam","doi":"10.1109/NRSC.2000.838840","DOIUrl":"https://doi.org/10.1109/NRSC.2000.838840","url":null,"abstract":"The paper presents the analysis for plane wave scattering from a grounded chiral substrate that is loaded by an array of square patches for the sake of minimizing the radar cross section (RCS) for the equipment covered by them. The analysis includes a chiral substrate with different electromagnetic parameters. It shows moderate frequency bands of good absorption for the structures presented.","PeriodicalId":211510,"journal":{"name":"Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128925072","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 : 2000-02-22DOI: 10.1109/NRSC.2000.838907
A. Abou El-fadl, T. E. Taha, A.A. Aboul-Enien
Hybrid-mode analysis is carried out for coplanar waveguide applicable to Z-cut Ti:LiNbO/sub 3/ optical modulators. The analysis is based on the integral equations. Generalized trial quantities are introduced as virtual adjustable sources in the equivalent network representation of the structure. The microwave effective index and the characteristic impedance as a function of the operating frequency of the coplanar are computed. The effect of the buffer layer thickness on both the microwave effective index and the characteristic impedance is studied. The effect of the structure dimensions on both the microwave effective index and the characteristic impedance is also discussed. Finally, the obtained results are compared and the data furnished by the literature. A good accuracy is obtained.
{"title":"Modelling and analysis of coplanar waveguide for LiNbO/sub 3/ optical modulators","authors":"A. Abou El-fadl, T. E. Taha, A.A. Aboul-Enien","doi":"10.1109/NRSC.2000.838907","DOIUrl":"https://doi.org/10.1109/NRSC.2000.838907","url":null,"abstract":"Hybrid-mode analysis is carried out for coplanar waveguide applicable to Z-cut Ti:LiNbO/sub 3/ optical modulators. The analysis is based on the integral equations. Generalized trial quantities are introduced as virtual adjustable sources in the equivalent network representation of the structure. The microwave effective index and the characteristic impedance as a function of the operating frequency of the coplanar are computed. The effect of the buffer layer thickness on both the microwave effective index and the characteristic impedance is studied. The effect of the structure dimensions on both the microwave effective index and the characteristic impedance is also discussed. Finally, the obtained results are compared and the data furnished by the literature. A good accuracy is obtained.","PeriodicalId":211510,"journal":{"name":"Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128958585","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 : 2000-02-22DOI: 10.1109/NRSC.2000.838967
E. El-Sayed
The overall objective the research work described in this paper was to design a radiation hard CMOS active pixel sensor (APS), which is intended for use in imaging systems flown on future NASA space missions in the era of ever decreasing mass and power budgets. The radiation hard designs of essential circuits required to enable the design of an experimental radiation hard CMOS APS image sensor are described. The completed design of a radiation hard CMOS APS image sensor is presented as well. The database of this design has been submitted to a mask house for a mask set generation and then fabrication. Plans for characterizing the chips after fabrication are currently being devised. This research work concludes that radiation hard CMOS APS image sensors are attainable. The combination of employing physical design techniques and a deep submicron standard CMOS fabrication process provides the path to radiation hard CMOS APS image sensors. Utilizing commercial standard CMOS fabrication processes to realize radiation hard image sensors makes economic sense. The cost element associated with these standard processes is less (by at least a factor of two) than the cost element associated with specialized radiation hard processes.
{"title":"Design of radiation hard CMOS APS image sensors for space applications","authors":"E. El-Sayed","doi":"10.1109/NRSC.2000.838967","DOIUrl":"https://doi.org/10.1109/NRSC.2000.838967","url":null,"abstract":"The overall objective the research work described in this paper was to design a radiation hard CMOS active pixel sensor (APS), which is intended for use in imaging systems flown on future NASA space missions in the era of ever decreasing mass and power budgets. The radiation hard designs of essential circuits required to enable the design of an experimental radiation hard CMOS APS image sensor are described. The completed design of a radiation hard CMOS APS image sensor is presented as well. The database of this design has been submitted to a mask house for a mask set generation and then fabrication. Plans for characterizing the chips after fabrication are currently being devised. This research work concludes that radiation hard CMOS APS image sensors are attainable. The combination of employing physical design techniques and a deep submicron standard CMOS fabrication process provides the path to radiation hard CMOS APS image sensors. Utilizing commercial standard CMOS fabrication processes to realize radiation hard image sensors makes economic sense. The cost element associated with these standard processes is less (by at least a factor of two) than the cost element associated with specialized radiation hard processes.","PeriodicalId":211510,"journal":{"name":"Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128109753","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 : 2000-02-22DOI: 10.1109/NRSC.2000.838973
K. El-Shorbagy
The stabilizing effect of a strong HF (pump) electrical field on the Buneman instability in a plane relativistic plasma waveguide is investigated. A new mathematical technique, the separation method, is applied to the two-fluid plasma model to separate the equations, which describe the system, into two parts: temporal and space parts. The temporal (dynamical) part enables us to determine the frequencies and growth rates of unstable modes; this part within the redefinition of natural frequencies coincides with the system describing HF suppression of the Buneman instability in a uniform unbounded plasma. Natural frequencies of oscillations and spatial distribution of the amplitude of the self-consistent electrical field are determined from the solution of a boundary-value problem (space part) taking into account the specific spatial distribution of plasma density. Plasma electrons are considered to have a relativistic velocity. It is shown that the growth rate instability in the relativistic plasma has been reduced compared to the nonrelativistic plasma. Also, it is found that the relativistic plasma electrons have not affected the solution of the space part of the problem.
{"title":"HF electric field effect on Buneman's instability in a relativistic plasma waveguide","authors":"K. El-Shorbagy","doi":"10.1109/NRSC.2000.838973","DOIUrl":"https://doi.org/10.1109/NRSC.2000.838973","url":null,"abstract":"The stabilizing effect of a strong HF (pump) electrical field on the Buneman instability in a plane relativistic plasma waveguide is investigated. A new mathematical technique, the separation method, is applied to the two-fluid plasma model to separate the equations, which describe the system, into two parts: temporal and space parts. The temporal (dynamical) part enables us to determine the frequencies and growth rates of unstable modes; this part within the redefinition of natural frequencies coincides with the system describing HF suppression of the Buneman instability in a uniform unbounded plasma. Natural frequencies of oscillations and spatial distribution of the amplitude of the self-consistent electrical field are determined from the solution of a boundary-value problem (space part) taking into account the specific spatial distribution of plasma density. Plasma electrons are considered to have a relativistic velocity. It is shown that the growth rate instability in the relativistic plasma has been reduced compared to the nonrelativistic plasma. Also, it is found that the relativistic plasma electrons have not affected the solution of the space part of the problem.","PeriodicalId":211510,"journal":{"name":"Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127056781","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 : 2000-02-22DOI: 10.1109/NRSC.2000.838845
H. Ghouz, F. Elghany, M.M. Qutb
This paper presents an adaptive technique of filtering to suppress the interference in phased array search radar systems. This interference includes noise, clutter, and jamming signals. Unlike the time processing techniques, our filtering process is based upon the target Doppler shift as well as the interference spatial distribution to suppress adaptively the undesired signals. This can be achieved by estimating the spatial covariance matrix of the interference using the direct matrix inversion (DMI) algorithm to compute the optimum weights of the adaptive filter. This technique of filtering is referred to as the adaptive coherent space-time (ACST) filter. A computer code has been developed to simulate the adaptive space-time filtering process. The objective is to investigate and evaluate in detail the performance of the adaptive filter under different interference environments including total intercepted power, statistical model, type and spatial distribution. The results of our simulation show that with moderate filter complexity an appreciable improvement in the signal to interference plus noise ratio at the filter's output "SINR" is obtained. In addition, the filter's performance is very sensitive to the interference type which has a direction either coincident with or close to the desired signal direction. The adaptive filter presented in this paper is an attractive and robust solution for solving the detection problem of low radar target cross section in an interference background such as stealth aircraft.
{"title":"Adaptive space-time processing for interference suppression in phased array radar systems. I. Search radar","authors":"H. Ghouz, F. Elghany, M.M. Qutb","doi":"10.1109/NRSC.2000.838845","DOIUrl":"https://doi.org/10.1109/NRSC.2000.838845","url":null,"abstract":"This paper presents an adaptive technique of filtering to suppress the interference in phased array search radar systems. This interference includes noise, clutter, and jamming signals. Unlike the time processing techniques, our filtering process is based upon the target Doppler shift as well as the interference spatial distribution to suppress adaptively the undesired signals. This can be achieved by estimating the spatial covariance matrix of the interference using the direct matrix inversion (DMI) algorithm to compute the optimum weights of the adaptive filter. This technique of filtering is referred to as the adaptive coherent space-time (ACST) filter. A computer code has been developed to simulate the adaptive space-time filtering process. The objective is to investigate and evaluate in detail the performance of the adaptive filter under different interference environments including total intercepted power, statistical model, type and spatial distribution. The results of our simulation show that with moderate filter complexity an appreciable improvement in the signal to interference plus noise ratio at the filter's output \"SINR\" is obtained. In addition, the filter's performance is very sensitive to the interference type which has a direction either coincident with or close to the desired signal direction. The adaptive filter presented in this paper is an attractive and robust solution for solving the detection problem of low radar target cross section in an interference background such as stealth aircraft.","PeriodicalId":211510,"journal":{"name":"Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127230966","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 : 2000-02-22DOI: 10.1109/NRSC.2000.838923
E. Youssef, E. Sabry, M. Khedr
We address the problem of efficiently encoding video sequences. A new system is proposed that overcomes the temporal redundancy by a new block based motion estimation called the hybrid adaptive motion search algorithm (HAMS), different wavelet/wavelet packet types are used for decomposition of the error frames, then the coefficients are thresholded and encoded. The new system achieves a reasonable PSNR at good compression ratios.
{"title":"Hybrid adaptive motion search with wavelet/wavelet packet based motion residual video coding","authors":"E. Youssef, E. Sabry, M. Khedr","doi":"10.1109/NRSC.2000.838923","DOIUrl":"https://doi.org/10.1109/NRSC.2000.838923","url":null,"abstract":"We address the problem of efficiently encoding video sequences. A new system is proposed that overcomes the temporal redundancy by a new block based motion estimation called the hybrid adaptive motion search algorithm (HAMS), different wavelet/wavelet packet types are used for decomposition of the error frames, then the coefficients are thresholded and encoded. The new system achieves a reasonable PSNR at good compression ratios.","PeriodicalId":211510,"journal":{"name":"Proceedings of the Seventeenth National Radio Science Conference. 17th NRSC'2000 (IEEE Cat. No.00EX396)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2000-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133132111","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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