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粒子图像测速技术研究进展 被引量:64
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作者 许联锋 陈刚 +1 位作者 李建中 邵建斌 《力学进展》 EI CSCD 北大核心 2003年第4期533-540,共8页
粒子图像测速技术(PIV)作为一种全新的无扰、瞬态、全场速度测量方法,在流体力学及空气动力学研究领域具有极高的学术意义和实用价值.本文对PIV技术的原理、分类作了简要地介绍,详细归纳和评述了现有的各种速度信息的提取方法,并对拓扑... 粒子图像测速技术(PIV)作为一种全新的无扰、瞬态、全场速度测量方法,在流体力学及空气动力学研究领域具有极高的学术意义和实用价值.本文对PIV技术的原理、分类作了简要地介绍,详细归纳和评述了现有的各种速度信息的提取方法,并对拓扑图论、神经网络、遗传算法、模糊聚类等新技术在PIV中的应用以及三维PIV技术、两相流PIV测试技术进行了介绍.指出当前PIV技术除了向三维和多相流方向发展外,如何提高PIV的测量精度以及缩短计算时间仍然是目前研究的主要目标. PIV技术随着计算机技术、激光技术和CCD性能的发展。 展开更多
关键词 粒子图像测速技术 速度提取法 流体力学 空气动力学 PIV 轨迹 杨氏条纹 灰度分布图像相关 粒子分布图像相关 速度梯度张量 弹性模型 粒子轨迹追踪
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Fast Texture Segmentation Based on Semi-Local Region Descriptor and Active Contour 被引量:10
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作者 Nawal Houhou Jean-Philippe Thiran Xavier Bresson 《Numerical Mathematics(Theory,Methods and Applications)》 SCIE 2009年第4期445-468,共24页
In this paper, we present an efficient approach for unsupervised segmentation of natural and textural images based on the extraction of image features and a fast active contour segmentation model. We address the probl... In this paper, we present an efficient approach for unsupervised segmentation of natural and textural images based on the extraction of image features and a fast active contour segmentation model. We address the problem of textures where neither the gray-level information nor the boundary information is adequate for object extraction. This is often the case of natural images composed of both homogeneous and textured regions. Because these images cannot be in general directly processed by the gray-level information, we propose a new texture descriptor which intrinsically defines the geometry of textures using semi-local image information and tools from differential geometry. Then, we use the popular Kullback-Leibler distance to design an active contour model which distinguishes the background and textures of interest. The existence of a minimizing solution to the proposed segmentation model is proven. Finally, a texture segmentation algorithm based on the Split-Bregrnan method is introduced to extract meaningful objects in a fast way. Promising synthetic and real-world results for gray-scale and color images are presented. 展开更多
关键词 Semi-local image information Beltrami framework metric tensor active contour Kullback-Leibler distance split-Bregman method.
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