共查询到20条相似文献，搜索用时 78 毫秒
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目标跟踪是计算机视觉领域重要的研究方向之一。基于l1最小化稀疏表示的目标跟踪算法跟踪精度高,但是在跟踪部分遮挡目标或当背景中存在与目标相似的干扰物时会发生漂移。这主要是因为算法仅关注目标的整体特征,而忽略了目标局部特征的变化情况。为了解决该问题,提出基于目标外观局部稀疏表示的跟踪算法。首先,对待选样本进行分块,然后利用采集得到的模板对各分块进行稀疏表示并计算重构误差,最后选取累积误差最小的待选样本作为跟踪目标。实验结果表明,该算法在跟踪被部分遮挡的目标时相比l1跟踪算法有更高的准确度。 相似文献
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针对静止的自然图像,提出了一种基于有限脊波变换-Finite Ridgelet Transform(FRIT)域的水印算法．该算法利用二进小波提取原图像的模值图像之后,再对它进行分块,并分别对各个子块进行FRIT,最后把经过扩展谱技术处理得到的水印嵌入到每个子块能量最高的脊波系数中。水印的检测利用了相关函数法,且实现了水印的盲检测。实验证明该算法具有较强的鲁棒性。 相似文献
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吴淑英 《温州职业技术学院学报》2008,8(3)
针对传统三步搜索算法（TSS）的缺陷,提出十字-正方形模板运动估计快速算法（RSPS）。该算法利用运动矢量分布的中心偏置特性,结合起始运动矢量预测与零运动块预判断,有效提高运动估计搜索速度并保持较高的搜索精度。 相似文献
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为了对道路上行驶的车辆速度进行有效估计,提出了一种基于Harris Stephen角点检测算法和归一化互相关（Normalized Cross Correlation method,NCC）匹配算法的视频车辆检测系统。该系统对车辆进行跟踪,并测算车辆在干道和高速公路上的速度。通过使用Harris Stephen角点检测兴趣点,利用归一化互相关算法匹配对应角点,利用点对应关系确定车辆行驶的像素位移。根据车辆在连续视频帧中所有角点的总位移计算车辆的平均位移,结合帧率估计车速。实验结果表明,系统测速精度高,能实时估计出车辆行进的速度。 相似文献
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甘志英 《唐山师范学院学报》2023,(6):78-82
针对目标跟踪中的快速运动、旋转、遮挡等问题,采用核函数算法实现目标跟踪。利用卷积实现密集采样,使用高斯核函数岭回归估计目标位置,在线更新高斯模型和核相关滤波器。通过OTB数据集对算法进行实验验证,结果表明,算法Precision能达到69.7%,Success达到66.8%,跟踪速度达412fps。实验表明,算法在跟踪过程中可对旋转、模糊、遮挡图像中的目标进行有效跟踪,在多个指标上优于其它比较算法。 相似文献
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在对已有快速整像素运动估计算法中使用的模板进行分析和实际测试的基础上,提出了一种新的适合于大运动矢量搜索的搜索模板,然后把该模板和小菱形模板结合起来而形成了一种新的快速运动估计算法。该算法充分利用了相邻块运动矢量的相关性以及运动矢量的中心偏置特性,显著减少了运动估计的运算量。把该算法运用到视频编码标准H.264/AVC中,取得了良好的编码效果,实验结果表明,新的运动估计算法和FS及DS算法相比平均搜索速度分别提高了98.08%和48.71%;重建图像的信噪比比DS算法平均提高了0.001875dB,更接近FS算法的编码质量。 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献