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This paper describes features and methods for document image comparison and classification at the spatial layout level. The methods are useful for visual similarity based document retrieval as well as fast algorithms for initial document type classification without OCR. A novel feature set called interval encoding is introduced to capture elements of spatial layout. This feature set encodes region layout information in fixed-length vectors by capturing structural characteristics of the image. These fixed-length vectors are then compared to each other through a Manhattan distance computation for fast page layout comparison. The paper describes experiments and results to rank-order a set of document pages in terms of their layout similarity to a test document. We also demonstrate the usefulness of the features derived from interval coding in a hidden Markov model based page layout classification system that is trainable and extendible. The methods described in the paper can be used in various document retrieval tasks including visual similarity based retrieval, categorization and information extraction. 相似文献
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Gordon Burt 《British journal of educational technology : journal of the Council for Educational Technology》2006,37(1):121-130
An in‐depth investigation of the relationship between media effectiveness, essentiality, and amount of study was presented. Overall, effectiveness explains 48% of the variation in the amount of study. Students who found the media more effective studied the media more. Those media that were more effective were studied more. The relationship between effectiveness and amount of study is different for each medium. This is because media differ in their degree of ‘essentiality‐versus‐optionality’. Thus, the amount of study depends on a combination of effectiveness and essentiality. The relationship between effectiveness, essentiality, and amount of study is different for each student. This is because students differ in their ‘sensitivities’—their sensitivity to effectiveness and to essentiality. The final equation used effectiveness, essentiality, and sensitivity to explain 74% of the variation in the amount of study. The analysis was informed by a mathematical model. 相似文献
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Gordon Barnes 《Philosophical Books》2003,44(1):53-62
Book reviewed in this article:
M DePaul (ed), Resurrecting Old–Fashioned Foundationalism 相似文献
M DePaul (ed), Resurrecting Old–Fashioned Foundationalism 相似文献
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Robert A. Gordon 《Academic Questions》1988,1(3):74-92
Editor's note: In view of the controversies surrounding the subject of ethnicity, IQ, and educational policy, the editors
feel that the mission of the journal would be best served by opening them to extended debate. Consequently, in an upcoming
issueAcademic Questions will feature a broad exchange of views on these questions. 相似文献
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