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二值alpha平面辅助的视频对象快速运动估计算法 被引量:1
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作者 宋传鸣 王相海 张福炎 《软件学报》 EI CSCD 北大核心 2008年第4期829-841,共13页
提出了一种任意形状视频对象的快速运动估计方法.详细分析了alpha平面在视频对象的快速运动估计过程中起到的指导性作用,采用边界扩展和边界掩码技术,提出了一种新的二值alpha平面匹配衡量准则WBAMC (weighted binary alpha-plane match... 提出了一种任意形状视频对象的快速运动估计方法.详细分析了alpha平面在视频对象的快速运动估计过程中起到的指导性作用,采用边界扩展和边界掩码技术,提出了一种新的二值alpha平面匹配衡量准则WBAMC (weighted binary alpha-plane matching criterion).结合优先搜索策略,提出了二值alpha平面辅助的视频对象快速运动估计算法BAAME(binary alpha-plane assisted motion estimation),.首先,利用alpha平面和WBAMC准则,将边界宏块的搜索范围缩小至两个搜索起点的单调区域,再采用传统的快速运动估计算法确定其运动向量;然后,用边界宏块的运动向量预测内部宏块的搜索起点;最后,采用快速运动估计算法搜索内部宏块的运动向量.这种方法可与多种空间域和频率域运动估计算法相结合,有效地应用于基于对象的视频编码器中.实验结果表明,对于多种类型的标准测试视频流,BAAME算法始终能够保持较高的估计精度和主观质量,运动补偿的平均PSNR(peak signal-to-noise ratio)较DS(diamosd search)和PSA(pdoety search algorithm)(BAAS(binary alpha-plant assisted search)+DS)高出0.1dB~0.SdB,略低于FS(full search),但是其计算复杂度与FS相比降低了20倍. 展开更多
关键词 视频编码 运动估计 alpha平面 视频对象 块匹配准则
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在线视频分割实时后处理 被引量:1
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作者 钟凡 秦学英 +2 位作者 陈佳舟 莫铭臻 彭群生 《计算机学报》 EI CSCD 北大核心 2009年第2期261-267,共7页
在线视频分割的应用通常都需要对分割结果进行后处理,以消除误分割和边沿闪烁.基于图像抠图的方法太慢,而简单的对(前/背景)边界进行模糊不仅不能消除误分割,而且会导致清晰的边界被过度模糊.为了解决上述问题,文中提出了一种新的后处... 在线视频分割的应用通常都需要对分割结果进行后处理,以消除误分割和边沿闪烁.基于图像抠图的方法太慢,而简单的对(前/背景)边界进行模糊不仅不能消除误分割,而且会导致清晰的边界被过度模糊.为了解决上述问题,文中提出了一种新的后处理方法.对边界附近的每一像素,首先通过一种新的专门用于颜色聚类的快速聚类算法得到该像素周围的局部颜色模型,并用来重新估计像素的alpha值,以消除误分割.为了改善结果的一致性,再采用一种自适应的边界函数作光滑性约束.边界函数可根据像素的局部属性自适应地调整过渡区域的中心和宽度,这样就防止了将清晰的边界过度模糊.文中的算法速度很快,可以很好地满足在线视频分割的要求. 展开更多
关键词 alpha值 视频分割 抠图 快速聚类 边界模型
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基于GDI+的颜色配置组件 被引量:5
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作者 何海江 《计算机系统应用》 北大核心 2004年第5期51-54,共4页
介绍了一种基于GDI+的颜色配置组件的开发技术。组件包括模态和非模态两个窗体,其中非模态窗体可同时配置绘图时需要的前景色、背景色、边框色和透明度值。该组件可重用性强。
关键词 GDI+ 颜色 组件 图形编程 模拟按钮 alpha值
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The Relationship Between the Strategic and Growth Factors of Enterprise: Data of Mexico (Empirical Evidence)
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作者 Luis Aguilera Enriquez Martha Gonzalez Adame R. Rodrigo Rodriguez Camacho 《Chinese Business Review》 2012年第9期781-792,共12页
The growth has been studied from multiple angles and varied approaches so it is a factor that must be evaluated in micro, small and medium-sized enterprises (SMEs) in order to make decisions that improve their resul... The growth has been studied from multiple angles and varied approaches so it is a factor that must be evaluated in micro, small and medium-sized enterprises (SMEs) in order to make decisions that improve their results. In the same way, the creation of strategies need a deep situational analysis, it is equally important to the efficiency and effectiveness of such strategies so they become operational. The central question addressed in the present study was identifying the variables that provide its own validity and, secondly, to determine which variables have a higher impact on the response variable (sales). The survey contains 159 items in 58 grouped questions. The collected data from a sample of 109 enterprises from different sectors and sizes were codified in order to carry out general descriptive procedures. The reliability of the instrument showed a Cronbach's alpha value of 0.8. The main statistical method used was the regression analysis. In order to carry it out, six compound variables were entered for the factors of information technologies, innovation, trading efforts, human resources, quality and technology. The results reveal that the more prepared the manager is and the more effectiveness obtained from the training program then the better indicators of growth will be obtained as a result (i.e. sales). The more integration among quality indicators (development of specifications and cost reduction programs) is, the better levels of growth (i.e. sales and growth perception) will be. The information technologies must be analyzed by the enterprises because once they are classified by their size, it is possible to observe a positive and significant correlation in any of the two ways of measuring the company's growth. The results can be useful for the people in charge of key decisions in any kind of enterprise as it displays a theoretical background for identify their main competitive variables. 展开更多
关键词 strategies SMES sales growth innovation and competitiveness
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