With the progress of human society and the continuous development of science and technology, the research of computervision in China has made continuous progress and achieved certain achievements. The image target fe...
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With the progress of human society and the continuous development of science and technology, the research of computervision in China has made continuous progress and achieved certain achievements. The image target feature extraction technology is a better performance in this field, which can extract the features of the image by two aspects of the overall and local features to ensure the authenticity of the target extraction. In this paper, through expounding various kinds of representation methods of the whole and local extraction feature technology, the field and level of the application of these methods are discussed objectively, and the trend and difficulties in the development of feature extraction technology are analyzed in order to bring a limited reference for the readers.
We are currently building a particle tracking system for the measurement of convective heat transfer and pollutant displacement in full scale rooms. The flow is to be seeded with 3mm-large, neutrally buoyant helium fi...
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We are currently building a particle tracking system for the measurement of convective heat transfer and pollutant displacement in full scale rooms. The flow is to be seeded with 3mm-large, neutrally buoyant helium filled soap bubbles. Light is provided by 8 illumination units using florescent light. The seeded flow (air) is recorded by 3 high speed digital video cameras located along three perpendicular directions. The experiment is taking place in a 3.1*3.1*2.5m{sup}3 (W*D*H) test room whose boundary conditions and inner values like temperature, air velocity and solar radiation can be imposed and monitored. As the first step of the research, a specially designed tracking algorithm has been built and tested. The main features of the algorithm are shown. Especially, the procedure for identification of individual particles based on their 3D coordinates calculated by two cameras successively is explained.
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