A given (overcomplete) discrete oriented pymmid may be converted into a steemble pyramid by interpolation. We present a technique for deriving the optimal interpolation functions (otherwise called steering coeficients). The proposed scheme is demonstmted on a computationally efficient oriented pyramid, which is a variation on the Burt and Adelson pyramid. We apply the generated steerable pyramid to orientation-invarianttexture analysis to demonstrate its excellent rotational isotropy. High classiJcation rates and precise rotation identification are demonstrated.
Our long-term goal is to develop a trainable tool for locating patterns of interest in large image databases. Toward this goal we have developed a prototype system, based on classical jltering and statistical pattern recognition techniques, for automatically locating volcanoes in the Magellan SAR database of Venus. Training for the specific volcano-detection task is obtained by synthesizing feature templates (via normalization and principal components ana1ysis)from a small number of examples provided by experts. Candidate regions identified by a focus of attention (FOA) algorithm are classified based on correlations with the feature templates. Preliminary tests show performance comparable to trained human observers.
A new method for generating x-y separable steerable scalable approximations offilter kemels is proposed which is based on a generalization of the Singular Value Decomposition (SVD) to 3 dimensions. This "pseudo-SVD " impmves upon a p w w u s scheme due to Pemna in that it reduces convolution time and storage requirements. An adaptation of the pseudo-SVD is proposed to generate steerable and scalable kemels which an? suitable for use with a Laplacian pyramid. The properties of this method are illustrated experimentally in generating steerable and scalable approximations to an early vision edge-detection bmel.keywords: steerable, scalable filters, multi-msohtion multi-orientation filtering, early vision, multi-way arrays, S W , pyramid
A 38-year-old kidney transplant recipient was treated with antituberculous drugs due to mycobacterial joint infection due to Mycobacterium malmoense. Three days of starting combined therapy, cyclosporine blood concentration (CBC) decreased a 63% and was necessary to increase the cyclosporine dose. Clarithromycin was also added and the CBC and kidney function remained stable until 11 months later. Pirazinamide and isoniazide were withdrawn four months before without any analytical changes but when rifampicin and ethambutol were withdrawn, CBC showed an increase of 377% and creatinine level was worsened. It was necessary to reduce the cyclosporine dose and renal function improved within 6 weeks. When clarithromycin was discontinued, the CBC decreased a 69% which motivated gradually increasing the dose. CBC is liable to change in patients treated with drugs metabolized by cytochrome p450 system, and the effect and magnitude of a multiple interaction is unpredictable. Close monitoring is necessary to adjust the dosage.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.