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Abstract. This paper describes an automatic summarization approach that constructs a summary by extracting the significant sentences. The approach takes advantage of the cooccurrence relationships between terms only in the document. The techniques used are principal component analysis (PCA) to extract the significant terms and singular value decompostion (SVD) to find out the significant sentences. The PCA can quantify both the term frequency and term-term relationship in the document by the eigenvalue-eigenvector pairs. And the sentence-term matrix can be decomposed into the proper dimensional sentence-concentrated and term-concentrated marices which are used for the Euclidean distances between the sentence and term vectors and also removed the noise of variability in term usage by the SVD. Experimental results on Korean newspaper articles show that the proposed method is to be preferred over random selection of sentences or only PCA when summarization is the goal.

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In object segmentation field, while the non-predefined object segmentation distinguishes arbitrary self-assumed object from background, predefined object segmentation pre-specifies object evidently. This paper presents a new method to segment predefined objects by globally optimizing an orientation-based objective function that measures the fitness of object boundary in a discretized parameter space. A specific object is explicitly described by normalized discrete sets of boundary points and corresponding normal vectors with respect to its plane shapes in a certain aspect. The orientation factor provides robust distinctness for target objects. By considering the order relation of transformation elements, and their dependency on derived oversegmentation outcome, the domain of translations and scales is discretized efficiently. The appropriate transformation parameters of a shape model corresponding to a target object in an image are determined using the global optimization algorithm branch-bound. Discrete boundary points of the consequent transformed model are chained together to produce the final contour of the target object. The results tested on PASCAL dataset show a considerable achievement in solving complex background and unclear boundary images.