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We propose two methods for avoiding misplacement phase error in terahertz reflection time-domain spectroscopy (THz-RTDS). The absorption signatures of the materials are extracted directly from the second-order derivative of the phase of the sample beam or the first derivative of the relative reflectance with respect to frequency. The techniques provide straightforward and fast solutions to solve the...
This paper presents a novel symmetrical weighted principal component analysis (SWPCA) space for feature extraction and its application to face recognition. Specifically, SWPCA first applies mirror transform to facial images, and gets the odd and even symmetrical images based on the odd-even decomposition theory. Then, weighted PCA is performed on the odd and even symmetrical training sample sets respectively...
Most of the current information retrieval systems are mainly based on full text matching of keywords or topic-based classification, often return a large number of irrelevant information, and are unable to meet the user's request. Ontology-based semantic retrieval is a hot issue in current research. In this paper, the corn plant ontology is constructed using Formal Concept Analysis based approach in...
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