The integration of the Lab model with the extended histogram of oriented gradients （EHOG） is proposed to improve the accuracy of human appearance matching across disjoint camera views under perturbations such as ill...The integration of the Lab model with the extended histogram of oriented gradients （EHOG） is proposed to improve the accuracy of human appearance matching across disjoint camera views under perturbations such as illumination changes and different viewing angles. For the Lab model that describes the global information of observations, a sorted nearest neighbor clustering method is proposed for color clustering and then a partitioned color matching method is used to calculate the color similarity between observations. The Bhattacharya distance is employed for the textural similarity calculation of the EHOG which describes the local information. The global information, which is robust to different viewing angles and scale changes, describes the observations well. Meanwhile, the use of local information, which is robust to illumination changes, can strengthen the discriminative ability of the method. The integration of global and local information improves the accuracy and robustness of the proposed matching approach. Experiments are carried out indoors, and the results show a high matching accuracy of the proposed method.展开更多
In order to improve the robustness of the differential number watermarking (DNW) algorithm proposed by us before, we proposed turbo-based DNW (T-DNW) in which the turbo code was employed in the DNW algorithm. The turb...In order to improve the robustness of the differential number watermarking (DNW) algorithm proposed by us before, we proposed turbo-based DNW (T-DNW) in which the turbo code was employed in the DNW algorithm. The turbo code was used to encode the message prior to watermark embedding and decode the watermark posterior to watermark detection. From the analysis and experiments, the following conclusion could be drawn. The T-DNW algorithm has little higher computational complexity than DNW. And both algorithms have the same performance in terms of watermark visual quality impact. Furthermore, the T-DNW algorithm is much more robust against some common attack than DNW. Although the T-DNW algorithm sacrifices a half payload, we think the achievements are encouraging.展开更多
Pornographic image/video recognition plays a vital role in network information surveillance and management. In this paper, its key techniques, such as skin detection, key frame extraction, and classifier design, etc.,...Pornographic image/video recognition plays a vital role in network information surveillance and management. In this paper, its key techniques, such as skin detection, key frame extraction, and classifier design, etc., are studied in compressed domain. A skin detection method based on data-mining in compressed domain is proposed firstly and achieves the higher detection accuracy as well as higher speed. Then, a cascade scheme of pornographic image recognition based on selective decision tree ensemble is proposed in order to improve both the speed and accuracy of recognition. A pornographic video oriented key frame extraction solution in compressed domain and an approach of pornographic video recognition are discussed respectively in the end.展开更多
图像是视觉所及环境的自然再现,具有表达直观、内容丰富的特性,其已成为GIS空间数据采集与应用中一种重要的可视数据源。随着硬件终端的高速发展,集成的传感器愈加丰富,多源传感器信息融合已成为移动GIS数据釆集的发展趋势。针对移动终...图像是视觉所及环境的自然再现,具有表达直观、内容丰富的特性,其已成为GIS空间数据采集与应用中一种重要的可视数据源。随着硬件终端的高速发展,集成的传感器愈加丰富,多源传感器信息融合已成为移动GIS数据釆集的发展趋势。针对移动终端获取方位角偏差问题,本文重点阐述了基于移动终端的重力传感器与磁力传感器获取镜头拍摄朝向的算法,并基于EXIF图像格式实现了图像元数据、定位信息、方位信息一体化采集生成可定位图像。针对现有可定位图像以点代面建模方式的不足,本文以镜头视野范围AOV(Angle of View)模型为基础,提出了以图像元数据、位置信息以及方位信息构建图像可视域的方法,并采用多级网格方式对图像可视域面状特征建立空间索引,实现基于可视域的图像检索。在此基础上,针对福建省野外遥感核查采集的8022幅可定位图像,采用点建模及可视域建模2种方式建立检索图像集。从检索速度、检索结果2个方面进行对比分析,表明基于可视域图像检索方法不仅能检索出拍摄位置在检索区域内的图像,还可检索出拍摄位置在检索区域外但实际拍摄场景在检索范围内的图像。同时,通过多级空间网格索引可提升6.22-8.64倍检索速度。展开更多
基金The National Natural Science Foundation of China(No.60972001)the Science and Technology Plan of Suzhou City(No.SG201076)
文摘The integration of the Lab model with the extended histogram of oriented gradients （EHOG） is proposed to improve the accuracy of human appearance matching across disjoint camera views under perturbations such as illumination changes and different viewing angles. For the Lab model that describes the global information of observations, a sorted nearest neighbor clustering method is proposed for color clustering and then a partitioned color matching method is used to calculate the color similarity between observations. The Bhattacharya distance is employed for the textural similarity calculation of the EHOG which describes the local information. The global information, which is robust to different viewing angles and scale changes, describes the observations well. Meanwhile, the use of local information, which is robust to illumination changes, can strengthen the discriminative ability of the method. The integration of global and local information improves the accuracy and robustness of the proposed matching approach. Experiments are carried out indoors, and the results show a high matching accuracy of the proposed method.
文摘In order to improve the robustness of the differential number watermarking (DNW) algorithm proposed by us before, we proposed turbo-based DNW (T-DNW) in which the turbo code was employed in the DNW algorithm. The turbo code was used to encode the message prior to watermark embedding and decode the watermark posterior to watermark detection. From the analysis and experiments, the following conclusion could be drawn. The T-DNW algorithm has little higher computational complexity than DNW. And both algorithms have the same performance in terms of watermark visual quality impact. Furthermore, the T-DNW algorithm is much more robust against some common attack than DNW. Although the T-DNW algorithm sacrifices a half payload, we think the achievements are encouraging.
基金Supported by the National Natural Science Foundation of China (No.60772069)863 High-Tech Project (2008AA01A313)
文摘Pornographic image/video recognition plays a vital role in network information surveillance and management. In this paper, its key techniques, such as skin detection, key frame extraction, and classifier design, etc., are studied in compressed domain. A skin detection method based on data-mining in compressed domain is proposed firstly and achieves the higher detection accuracy as well as higher speed. Then, a cascade scheme of pornographic image recognition based on selective decision tree ensemble is proposed in order to improve both the speed and accuracy of recognition. A pornographic video oriented key frame extraction solution in compressed domain and an approach of pornographic video recognition are discussed respectively in the end.
文摘图像是视觉所及环境的自然再现,具有表达直观、内容丰富的特性,其已成为GIS空间数据采集与应用中一种重要的可视数据源。随着硬件终端的高速发展,集成的传感器愈加丰富,多源传感器信息融合已成为移动GIS数据釆集的发展趋势。针对移动终端获取方位角偏差问题,本文重点阐述了基于移动终端的重力传感器与磁力传感器获取镜头拍摄朝向的算法,并基于EXIF图像格式实现了图像元数据、定位信息、方位信息一体化采集生成可定位图像。针对现有可定位图像以点代面建模方式的不足,本文以镜头视野范围AOV(Angle of View)模型为基础,提出了以图像元数据、位置信息以及方位信息构建图像可视域的方法,并采用多级网格方式对图像可视域面状特征建立空间索引,实现基于可视域的图像检索。在此基础上,针对福建省野外遥感核查采集的8022幅可定位图像,采用点建模及可视域建模2种方式建立检索图像集。从检索速度、检索结果2个方面进行对比分析,表明基于可视域图像检索方法不仅能检索出拍摄位置在检索区域内的图像,还可检索出拍摄位置在检索区域外但实际拍摄场景在检索范围内的图像。同时,通过多级空间网格索引可提升6.22-8.64倍检索速度。
