企业整体式模式在航天高科技企业的应用

针对航天高科技企业技术综合性和系统集成性强,知识密集性和技术密集性程度高,并处于特殊的军工行业,在产业方面具有经营的非均衡性和技术驱动性的特点,提出利用企业整体式模式理论,建构航天高科技企业整体式模式,对该模式的作用机理、目标、主要内容、构建过程及效果进行了系统的分析。阐明了运用整体观点进行整合管理,在提高企业协调能力和适应能力上的优越性。     

Video segmentation using multiple features based on EM algorithm

Object-based video segmentation is an important issue for many multimedia applications. A video segmentation method based on EM algorithm is proposed. We consider video segmentation as an unsupervised classification problem and apply EM algorithm to obtain the maximum-likelihood estimation of the Gaussian model parameters for model-based segmentation. We simultaneously combine multiple features (motion, color) within a maximum likelihood framework to obtain accurate segment results. We also use the temporal consistency among video frames to improve the speed of EM algorithm. Experimental results on typical MPEG-4 sequences and real scene sequences show that our method has an attractive accuracy and robustness.     

基于背景复杂程度估计的红外图像预处理

从频率意义上对红外小目标图像的基本特征进行了分析,提出了一种基于红外图像加权信息熵的背景复杂程度估计方法,及一种自适应巴特沃思(Butterworth)高通滤波器截止频率调整策略。实践证明,该方法可以较大程度地保留图像中小目标对象的频率信息,基本做到天空背景中处理质量较好,海杂波背景中保证小目标不丢失。图像预处理的良好鲁棒性得到了体现。