A major problem in form reading applications is that form fields can not be located exactly because of nonlinear distortions on the form images. Such non-linear distortions appear for example on photocopied forms or o...
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ISBN:
(纸本)0818678984;0818678992
A major problem in form reading applications is that form fields can not be located exactly because of nonlinear distortions on the form images. Such non-linear distortions appear for example on photocopied forms or on forms transmitted by fax. One way to solve this problem if do determine the form fields by considering the positions of the form lines. This paper describes a new method to End pairs of corresponding form-lines an a reference form and a filled form. The advantage of this method is that the corresponding line-pairs can be used to map any pixel of the filled form and the reference form without any assumption about the kind of distortion. The care of this method is an algorithm that is based on the A*-searcha*-algorithm. Given two sets of horizontal or vertical lines, one from the reference form and one from the piled form, It is searched for pairs of corresponding fines. The algorithm's runtime keeps low and nonlinear distortions of the form-images hardly influence its results. With increasing complexity - i.e. increasing number of lines or decreasing image quality - the number of rejected form-lines grows, but the error-rate stays lour.
In this paper, we explore the approach to applying a combination of join and semi-join operations to minimize the amount of data transmission required for distributed query processing. Specifically, we identify and ex...
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In this paper, we explore the approach to applying a combination of join and semi-join operations to minimize the amount of data transmission required for distributed query processing. Specifically, we identify and exploit two important concepts which occur with the use of join operations as reducers in query processing, namely, gainful semi-joins and pure join attributes. Some semi-joins, though not profitable themselves, may benefit the execution of subsequent join operations, and become profitable owing to the use of join operations as reducers. Such a semi-join is termed a gainful semi-join. In addition, join attributes which are not part of the output attributes are referred to as pure join attributes. We shall not only exploit the usefulness of gainful semi-joins, but also utilize the removability of pure join attributes to reduce the amount of data transmission required for query processing. Moreover, in light of the two concepts, heuristic searches are developed to determine a sequence of join and semi-join reducers for query processing. Our results show the importance of the approach to combining joins and semi-joins for distributed query processing.
Stacking velocity is a very important parameter in seismic data processing. Until now the determination of stacking velocity has been done manually. This article proposes an automatic algorithm for picking stacking ve...
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Stacking velocity is a very important parameter in seismic data processing. Until now the determination of stacking velocity has been done manually. This article proposes an automatic algorithm for picking stacking velocity. The algorithm uses artificial intelligence and pattern recognition techniques.
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