the summation CFAR detector is widely used for the detection of narrowband signals. the normalized detection threshold determines the detection performance and must be appropriately chosen in practical applications. H...
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ISBN:
(纸本)9780889866706
the summation CFAR detector is widely used for the detection of narrowband signals. the normalized detection threshold determines the detection performance and must be appropriately chosen in practical applications. However, numerical problems often occur in the theoretical computation of the normalized detection threshold, particularly when channel power estimates are summed over a large number of overlapped input data blocks. this paper shows that the correlation between power estimates at the output of an FFT filter bank for successive input data blocks can be neglected for most common windows when the overlap ratio is less than or equal to 1/2. Under this constraint the normalized detection thresholds computed for overlapped and non-overlapped input data blocks are practically identical and the results for the probability of false alarm for a given threshold derived for non-overlapped input data blocks are applicable to overlapped input data blocks. this substantially simplifies the problem of computingthe normalized detection threshold for overlapped input data blocks.
Based on analyzing the relationship between the Karush-Kuhn-Tucker(KKT) conditions of support vector machine and the distribution of the training samples,the possible changes of support vector set
ISBN:
(纸本)0780397371
Based on analyzing the relationship between the Karush-Kuhn-Tucker(KKT) conditions of support vector machine and the distribution of the training samples,the possible changes of support vector set
As different posture has different projection histogram pattern,. the projection histogram can be used as one of the features to discriminate different postures. In this paper, a new method using projection histogram ...
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ISBN:
(纸本)9780780397361
As different posture has different projection histogram pattern,. the projection histogram can be used as one of the features to discriminate different postures. In this paper, a new method using projection histogram for static human posture recognition is proposed. It comprises of three key modules: background subtraction, projection histogram computing and template matching. Comparing with many other methods, our approach is fast, simple and less sensitive to noise. Using our new method, a system is implemented and tested with ten static postures. It can automatically recognize them with high percentage of right decisions.
the task of faults localization is discussed in a model-free setting. As a tool for its solution we consider a multiclass patternrecognition problem with a metric in the label space. then, this problem is approximate...
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ISBN:
(纸本)3540357483
the task of faults localization is discussed in a model-free setting. As a tool for its solution we consider a multiclass patternrecognition problem with a metric in the label space. then, this problem is approximately solved, providing hints on selecting appropriate RBF nets. It was shown that the approximate solution is the exact one in several important cases. Finally, we propose the algorithm for learning the proposed RBF net. the results of its testing are briefly reported.
Adaptive Histogram Equalization(AHE) is a popular and effective algorithm for image contrast *** it's quite computationally expensive and time *** this paper,a fast implementation of AHE based on pure software tec...
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ISBN:
(纸本)0780397371
Adaptive Histogram Equalization(AHE) is a popular and effective algorithm for image contrast *** it's quite computationally expensive and time *** this paper,a fast implementation of AHE based on pure software techniques is *** accelerative techniques are combined to form the new fast AHE:First,local histogram is acquired by an iterative approach with a sliding window;Second,in computing cumulative histogram function,not more than half of the histogram is cumulated;third,by keep the block size W2 equal to the product of grey level number and integral power of 2,all the multiplication and division operations are replaced with fast bitwise *** theoretical analysis and experimental results demonstrate the proposed algorithm is effective.
recognition of everyday physical activities is difficult due to the challenges of building informative, yet unobtrusive sensors. the most widely deployed and used mobile computing device today is the mobile phone, whi...
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ISBN:
(纸本)3540396349
recognition of everyday physical activities is difficult due to the challenges of building informative, yet unobtrusive sensors. the most widely deployed and used mobile computing device today is the mobile phone, which presents an obvious candidate for recognizing activities. this paper explores how coarse-grained GSM data from mobile phones can be used to recognize high-level properties of user mobility, and daily step count. We demonstrate that even without knowledge of observed cell tower locations, we can recognize mobility modes that are useful for several application domains. Our mobility detection system was evaluated with GSM traces from the everyday lives of three data collectors over a period of one month, yielding an overall average accuracy of 85%, and a daily step count number that reasonably approximates the numbers determined by several commercial pedometers.
We propose a predictive scheme, where the NIT stores only current day movement log and sends this log to MSC during off-peak hours. the MSC performs offline computation to find unique sub-pattems and hot cells from pa...
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ISBN:
(纸本)9783540681397
We propose a predictive scheme, where the NIT stores only current day movement log and sends this log to MSC during off-peak hours. the MSC performs offline computation to find unique sub-pattems and hot cells from pattern logs. the hot cells are downloaded in the MT which sends an update when it leaves a hot cell thus enables the MSC to identify the sub-pattern to be followed next. On arrival (if a call the MSC performs selective paging Analytical study shows the total location management cost using the proposed scheme is far better than distance-based location management scheme.
An algorithm for automatic estimation of 3D transformations between two objects is presented in this paper. Skeletons of the 3D objects are created using a fully parallel thinning technique, feature point pairs (land ...
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As different posture has different projection histogram pattern, the projection histogram can be used as one of the features to discriminate different postures. In this paper, a new method using projection histogram f...
详细信息
As different posture has different projection histogram pattern, the projection histogram can be used as one of the features to discriminate different postures. In this paper, a new method using projection histogram for static human posture recognition is proposed. It comprises of three key modules: background subtraction, projection histogram computing and template matching. Comparing with many other methods, our approach is fast, simple and less sensitive to noise. Using our new method, a system is implemented and tested with ten static postures. It can automatically recognize them with high percentage of right decisions
Adaptive histogram equalization (AHE) is a popular and effective algorithm for image contrast enhancement. But it's quite computationally expensive and time consuming. In this paper, a fast implementation of AHE b...
详细信息
Adaptive histogram equalization (AHE) is a popular and effective algorithm for image contrast enhancement. But it's quite computationally expensive and time consuming. In this paper, a fast implementation of AHE based on pure software techniques is proposed. three accelerative techniques are combined to form the new fast AHE: first, local histogram is acquired by an iterative approach with a sliding window; second, in computing cumulative histogram function, not more than half of the histogram is cumulated; third, by keep the block size W2 equal to the product of grey level number and integral power of 2, all the multiplication and division operations are replaced with fast bitwise shift. Boththeoretical analysis and experimental results demonstrate the proposed algorithm is effective
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