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Hyperspectral images have considerable spectral information, and lots of spectral similarity measures have been developed for hyperspectral image analysis. However, little research has been done on the effectiveness of the spectral similarity measures. This paper introduced three spectral discriminatory measures, the spectral discriminatory probability, the discriminatory power and the spectral discriminatory...
In MPEG-2 to MPEG-4 Simple Profile (SP) transcoder based on the discrete cosine transform (DCT) domain, data conversion from the field DCT to frame DCT must be implemented. We proposed a low-complexity conversion method based on the DCT domain, which does not need performing inverse DCT and DCT. This method exploits the relationship between the filed DCT and the frame DCT on the transform domain to...
Content-based image retrieval is an important research topic in computer vision. MPEG-7 set up a set of standardized description of image contents. By introducing the widely used feature descriptors, we analyze the limitation and deficiency of retrieval methods based on global features in this paper. Meanwhile, an image retrieval approach based on integrated features of regions for MPEG-7 is put forward...
The adsorption and photodecomposition of diphenolic acid (DPA) was investigated in the presence of alpha- or beta- cyclodextrins (CDs) and TiO2 suspensions. The adsorption of DPA on TiO2 surface and inclusion complex of CDs and DPA were critical factor in the photocatalytic reaction. Results showed that, the adsorption isotherms of DPA could be plotted with the Langmuir isotherm model, and the maximum...
This paper investigated the photocatalysis degradation of diphenolic acid (DPA) in the presence of beta-cyclodextrin (beta-CD) under a 30 W UV lamp ( lambdamax=254 nm ). In control experiment, the photodegradation rate of DPA is enhanced 33.5% after 30 min irradiation. The interaction of DPA with beta-CD yielded the formation of inclusion complexes at 1:1 stoichiometric ratio in solution, and beta-CD...
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