Utility based and user defined scoring based mining of sequential patterns

Date

2015

Author

Kırmemiş Alkan, Öznur

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In this thesis, a novel method for computing disparity maps from a multi-modal stereo-vision system composed of an infrared-visible camera pair is introduced. The method uses mutual information as the basic similarity measure where a segmentation based adaptive windowing mechanism is proposed along with a novel mutual information computation surface for greatly enhancing the results. Besides, the method incorporates joint prior probabilities when computing the cost matrix in addition to negative mutual information measures. A novel adaptive cost aggregation method is also proposed using computed cost confidences and resulting minimum cost disparities that are confident enough are fitted planes in segments. The segments are refined by iteratively splitting and merging according to the fitted confident disparities that helps to reduce the dependence of the disparity computation to the initial segmentation. Finally, all the steps are repeated iteratively where more accurate joint probabilities are calculated by sing previous iteration’s disparity map. Two multi-modal stereo image datasets are generated for evaluating the method and the state of the art methods confronted in literature; the synthetically altered image pairs from the Middlebury Stereo Evaluation Dataset, and our own dataset of Kinect Device infrared- visible camera image pairs, which can function as a benchmark for multi-modal stereo-vision methods. On these datasets, it is presented that (i) the proposed method improves the quality of existing MI formulation, (ii) the proposed method outperforms state of the art methods in literature, and (iii) the proposed method can provide depth comparable to the quality of Kinect depth data.

Subject Keywords

Sequential pattern mining., Web databases., Web search engines., Internet searching.

URI

http://etd.lib.metu.edu.tr/upload/12618743/index.pdf
https://hdl.handle.net/11511/24648

Collections

Graduate School of Natural and Applied Sciences, Thesis