The quality of virtual view based on multi-view video (MVD) plus depth format is often evaluated by PSNR or subjectively judged. However, due to synthesizing arbitrary view images, the virtual view images mostly hav...The quality of virtual view based on multi-view video (MVD) plus depth format is often evaluated by PSNR or subjectively judged. However, due to synthesizing arbitrary view images, the virtual view images mostly have no reference images and are only assessed using non-reference. Virtual view images synthesized by depth estimation reference software (DERS) and view synthesis reference software (VSRS) often accompanied with blockiness and other distortions on the edge. In addition, matching level for the depth map and the corresponding texture maps of left and right views also affects the quality of the virtual view. This paper compares the edge similarity of the depth and the corresponding texture maps which generate the intermediate virtual view and combined with the virtual view's blockiness which causing blur to evaluate the quality of the virtual view. Experiment results show that the proposed method can reflect the quality of the virtual view better.展开更多
The condition of weightes non-dictatorship is extended and a comprehensive evaluae method emboding self-determinate which is combined with competitive view optimization principles is built. The basic process includes ...The condition of weightes non-dictatorship is extended and a comprehensive evaluae method emboding self-determinate which is combined with competitive view optimization principles is built. The basic process includes simulating the model of economic man's self-benefit bahaviors, taking the place of experts to evaluate, bringing in the model of minimizing the sum of included angles to integrate the information of multiple objects and put the objects in order finally. The method has the advangtages of less dependendence on the subjective information, plenty of information, fair process and simple caculating. Finally, an application example is given to illustrate the effectiveness of the proposed method.展开更多
For any software company that frequently performs quality assurance activities devoted to measurement, evaluation (ME) and change/improvement (MEC) projects, ME and MEC strategies can be valuable organizational assets...For any software company that frequently performs quality assurance activities devoted to measurement, evaluation (ME) and change/improvement (MEC) projects, ME and MEC strategies can be valuable organizational assets. In this paper, we analyze the improvement of a ME strategy, which can be considered an organizational resource to be applied to quality assurance activities. This resource is called the GOCAME (Goal-Oriented Context-Aware Measurement and Evaluation) strategy. AME/MEC strategy embraces the next three integrated capabilities: 1) the ME/MEC domain conceptual base and framework;2) the process perspective specifications;and, 3) the method specifications. The improvement of GOCAME was performed instantiating two strategy patterns. A strategy pattern is a reusable solution to recurrent problems in ME/MEC projects. For an improvement goal, the selected MEC strategy pattern allows instantiating in a project a set of tailored activities and methods for measurement, evaluation, analysis and change. Particularly, we instantiate the GoME_1QV (Goal-oriented Measurement and Evaluation for One Quality View) strategy pattern to understand the GOCAME current quality state and compare it with the so-called GQM+ Strategies. First, this evaluation and analysis allows us to know the GOCAME strengths and weaknesses with regard to the quality of the three capabilities. Second, we instantiate the GoMEC_1QV (Goal-oriented Measurement, Evaluation and Change for One Quality View) strategy pattern to improve the GOCAME current state, producing as result a new version of the GOCAME strategy.展开更多
蝶形图是交流电磁场检测(alternating current field measurement,ACFM)中判定缺陷存在的一种重要方法。为研究常规裂纹蝶形图与裂纹剖面的映射关系,首先利用COMSOL Multiphysics实现不同尺寸裂纹的数值模拟,并建立了长度和深度特征量...蝶形图是交流电磁场检测(alternating current field measurement,ACFM)中判定缺陷存在的一种重要方法。为研究常规裂纹蝶形图与裂纹剖面的映射关系,首先利用COMSOL Multiphysics实现不同尺寸裂纹的数值模拟,并建立了长度和深度特征量的重构方程。其次通过对比,分析了蝶形图与裂纹剖面的内在关系,进一步结合图像处理法和常规线性拟合方法分别建立了两者的映射关系方程。最后,对Q235钢不同尺寸的槽状裂纹进行了检测试验。试验结果表明:基于长度和深度的裂纹剖面误差分别为5.46%和6.02%。该研究实现了蝶形图的再利用,为缺陷的风险评估方法提供了重要的参考。展开更多
基于涉及街道景观要素与街道可步行性关系的研究还存在一定缺失,以广州市天河区代表性综合街区华师-体育中心片区为对象,对城市街区的可步行性进行研究。综合马斯洛需求层次理论和“步行需求层次”模型,选取安全性、舒适性、社交性、美...基于涉及街道景观要素与街道可步行性关系的研究还存在一定缺失,以广州市天河区代表性综合街区华师-体育中心片区为对象,对城市街区的可步行性进行研究。综合马斯洛需求层次理论和“步行需求层次”模型,选取安全性、舒适性、社交性、美观性为指标建立街景特征评价指标体系。通过Insta360 ONE X2全景相机采集、图像语义切割、人机对抗模型评分、SPSS分析(Pearson相关性分析、多元线性回归分析)等多种方法,研究街景特征与可步行性关系。结果表明,4类街景特征与可步行性均具有一定相关性,其中,舒适性方面的绿视率对街道可步行性的影响最为显著。基于分析结果,街道空间可以从安全性、舒适性、社交性和美观性的街景特征层面进行步行性优化提升,如在安全性方面,建议增设护栏或绿化带,增设、整合标识牌等。展开更多
基金supported by the National Natural Science Foundation of China(Grant No.60832003)the Key Laboratory of Advanced Display and System Application(Shanghai University),Ministry of Education,China(Grant No.p200902)+1 种基金the Science and Technology Commission of Shanghai Municipality(Grant No.10510500500)the Natural Science Foundation of Anhui Higher Education Institutions of China(Grant No.KJ2011Z008)
文摘The quality of virtual view based on multi-view video (MVD) plus depth format is often evaluated by PSNR or subjectively judged. However, due to synthesizing arbitrary view images, the virtual view images mostly have no reference images and are only assessed using non-reference. Virtual view images synthesized by depth estimation reference software (DERS) and view synthesis reference software (VSRS) often accompanied with blockiness and other distortions on the edge. In addition, matching level for the depth map and the corresponding texture maps of left and right views also affects the quality of the virtual view. This paper compares the edge similarity of the depth and the corresponding texture maps which generate the intermediate virtual view and combined with the virtual view's blockiness which causing blur to evaluate the quality of the virtual view. Experiment results show that the proposed method can reflect the quality of the virtual view better.
基金supported by the National Natural Science Foundation of China(70801013)LNSTF for doc-tor(20081020).
文摘The condition of weightes non-dictatorship is extended and a comprehensive evaluae method emboding self-determinate which is combined with competitive view optimization principles is built. The basic process includes simulating the model of economic man's self-benefit bahaviors, taking the place of experts to evaluate, bringing in the model of minimizing the sum of included angles to integrate the information of multiple objects and put the objects in order finally. The method has the advangtages of less dependendence on the subjective information, plenty of information, fair process and simple caculating. Finally, an application example is given to illustrate the effectiveness of the proposed method.
文摘For any software company that frequently performs quality assurance activities devoted to measurement, evaluation (ME) and change/improvement (MEC) projects, ME and MEC strategies can be valuable organizational assets. In this paper, we analyze the improvement of a ME strategy, which can be considered an organizational resource to be applied to quality assurance activities. This resource is called the GOCAME (Goal-Oriented Context-Aware Measurement and Evaluation) strategy. AME/MEC strategy embraces the next three integrated capabilities: 1) the ME/MEC domain conceptual base and framework;2) the process perspective specifications;and, 3) the method specifications. The improvement of GOCAME was performed instantiating two strategy patterns. A strategy pattern is a reusable solution to recurrent problems in ME/MEC projects. For an improvement goal, the selected MEC strategy pattern allows instantiating in a project a set of tailored activities and methods for measurement, evaluation, analysis and change. Particularly, we instantiate the GoME_1QV (Goal-oriented Measurement and Evaluation for One Quality View) strategy pattern to understand the GOCAME current quality state and compare it with the so-called GQM+ Strategies. First, this evaluation and analysis allows us to know the GOCAME strengths and weaknesses with regard to the quality of the three capabilities. Second, we instantiate the GoMEC_1QV (Goal-oriented Measurement, Evaluation and Change for One Quality View) strategy pattern to improve the GOCAME current state, producing as result a new version of the GOCAME strategy.
文摘蝶形图是交流电磁场检测(alternating current field measurement,ACFM)中判定缺陷存在的一种重要方法。为研究常规裂纹蝶形图与裂纹剖面的映射关系,首先利用COMSOL Multiphysics实现不同尺寸裂纹的数值模拟,并建立了长度和深度特征量的重构方程。其次通过对比,分析了蝶形图与裂纹剖面的内在关系,进一步结合图像处理法和常规线性拟合方法分别建立了两者的映射关系方程。最后,对Q235钢不同尺寸的槽状裂纹进行了检测试验。试验结果表明:基于长度和深度的裂纹剖面误差分别为5.46%和6.02%。该研究实现了蝶形图的再利用,为缺陷的风险评估方法提供了重要的参考。
文摘基于涉及街道景观要素与街道可步行性关系的研究还存在一定缺失,以广州市天河区代表性综合街区华师-体育中心片区为对象,对城市街区的可步行性进行研究。综合马斯洛需求层次理论和“步行需求层次”模型,选取安全性、舒适性、社交性、美观性为指标建立街景特征评价指标体系。通过Insta360 ONE X2全景相机采集、图像语义切割、人机对抗模型评分、SPSS分析(Pearson相关性分析、多元线性回归分析)等多种方法,研究街景特征与可步行性关系。结果表明,4类街景特征与可步行性均具有一定相关性,其中,舒适性方面的绿视率对街道可步行性的影响最为显著。基于分析结果,街道空间可以从安全性、舒适性、社交性和美观性的街景特征层面进行步行性优化提升,如在安全性方面,建议增设护栏或绿化带,增设、整合标识牌等。