Learn More
OBJECTIVES The objective of this study was to make non-Chinese readers better informed about the current safety situation of acupuncture in China. METHODS Four (4) major Chinese comprehensive databases were searched: Chinese Journal Full-text Database (1949-2010), China Biomedical Literature Database (1978-2010), Chinese Technology Journal Database(More)
This paper presents a classification framework for extracting buildings from polarimetric SAR (PolSAR) data. Buildings in SAR data are generally composed of layover and shadow regions. First, mean shift bottom-up segmentation approach divides a SAR image into small homogeneous patches. Then conditional random fields (CRF) framework is applied to classify(More)
Building extraction from high resolution Synthetic Aperture Radar (SAR) has many promising applications in urban analysis. However, partial geometry and appearance information of buildings are not available in SAR images due to SAR imaging mechanism and geometric layout of urban areas. SAR images are slant range projection of scatterer reflections. With the(More)
Analysis of buildings in urban areas using high-resolution Synthetic Aperture Radar (SAR) images has received a lot of attentions in recent years. Exploiting multi-apect characteristics of buildings can help to improve detection accuracy. Look-angle dependency is a common effect in SAR images since radar scattering is often highly dependent on the(More)
We investigate the segmentation of high resolution polarimetric Synthetic Aperture Radar (PolSAR) images of urban areas. The segmentation strategy in [1] is applied in this paper. Spectral graph segmentation has the advantage of capturing non-local property. The probabilistic boundaries and patch features are integrated for spectral graph segmentation.(More)
A distribution of Synthetic Aperture Radar (SAR) amplitude data in urban areas has a heavy tail. Most of the energy, i.e. composed of low radar return from natural areas and shadow regions, concentrates in a tiny portion of the distribution. Some strong backscattering from man-made structures lie in the long tail. The contrast between the clutter and(More)
Occlusion is the concept that several objects interfere with one another in an image. This phenomenon is prevalent in high resolution Synthetic Aperture Radar (SAR) images in urban areas. Geometric contents, which enable us to analyze occlusion, are partially observable in high resolution SAR images. Estimation of occlusion boundaries helps to discriminate(More)
Many researches have been done to extract buildings from high resolution Synthetic Aperture Radar (SAR) data. The extraction problem is far from solved due to many constraints, e.g. SAR side-look imaging, speckle, and lack of object extent in SAR images. Building detection algorithms usually use intensity information or textures. Layovers and shadows can be(More)