共查询到18条相似文献,搜索用时 62 毫秒
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鱼眼相机成像视角大,获得信息丰富,在车载应用中具有广阔应用前景.本文提出了一种适用于移动单目鱼眼相机的运动目标检测方法.首先,提出一种子块运动补偿模型补偿图像背景运动,解决了现有运动补偿模型对强视差背景补偿效果不好的问题.其次,在子块运动补偿模型参数求解时,通过引入自车运动参数简化模型参数个数,并结合直接方法求解,避免了传统基于特征点匹配方法求解参数时易受误匹配特征点影响的问题.然后,针对鱼眼相机的成像形变问题,本文提出了一种三平面校正方法获取鱼眼图像的子块运动补偿图像.最后,利用鱼眼图像的子块运动补偿图像和真实拍摄图像的差异信息实现运动目标检测.多种测试场景下的实验结果表明了本文方法的有效性. 相似文献
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帧率上采样作为一种视频后处理技术,通过对原始视频插值得到高帧率视频,满足人们对高帧率视频的需求.传统基于重叠块的插值补偿算法会带来块效应或鬼影现象.为了解决这一问题,人们提出联合匹配块及其相邻块预测的方法,但是复杂度高,效果不明显.基于以上几点,本文提出一种自适应联合相邻运动矢量的运动补偿插值算法(Joint Motion-Compensated In-terpolation Algorithm Using Adjacent Block Motion Vectors Adaptively,AJ-MCI).在该算法中,将运动矢量矫正和运动补偿插值算法相结合,同时运动补偿模块中自适应地联合相邻匹配块,以最大限度刻画真实运动轨迹.实验结果表明,本文算法能很好的提升视频的主客观质量,同时保持较低计算复杂度. 相似文献
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提出了一种基于MPEG(moving picture experts group)的全局运动估计技术: 利用四参数模型来描述由摄像机运动带来的全局运动,再利用基于块匹配的算法来求解4个参数,进而作相应的运动补偿.由于MPEG视频流中的运动矢量蕴含了最优块匹配的信息,所以不需要对MPEG视频流完全解码,即可进行参数估计.实验证明该算法速度较快,并能通过运动补偿排除由摄像机运动造成的伪运动区域的干扰. 相似文献
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本文描述了一个有效的视频编码算法,该算法基于视频信号的分数像素精度重叠运动补偿预测和利用双正交滤波器组的区域子波分解,文中给出了采用24*24重叠块的编码器模拟结果。 相似文献
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提出了一种基于MPEG(moving Picture experts group)的全局运动估计技术;利用四参数模型来描述由摄像机运动带来的全局运动,再利用基于块匹配的算法来求解4个参数,进而作相应的运动补偿,由于MPEG视频流中的运动矢量蕴含了最优块匹配的信息,所以不需要对MPEG视频流完全解码,即可进行参数估计,实验证明该算法速度较快,并能通过运动补偿排除由摄像机运动造成的伪运动区域的干扰。 相似文献
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传统的基于载机运动传感器的SAR运动补偿对传感器测量精度提出了很高的要求,而基于回波数据的Map- Drift(MD)自聚焦效果对成像场景存在一定的依赖性。本文针对UWB SAR系统的特点,提出了一种结合GPS(Global Position System)粗补偿和改进重叠MD精补偿的机载SAR运动补偿方法。利用GPS的三维位置信息补偿回波时移误差,利用三维速度信息补偿回波相位误差,然后再利用改进重叠MD补偿剩余误差。本文提出的UWB SAR运动补偿方法没有使用高精度的惯导系统,节约了系统成本,降低了补偿系统的实现难度,并减小了MD算法对成像场景的依赖性,有效提升了SAR图像质量。实际UWB SAR数据的处理验证了本文方法的有效性。 相似文献
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本文首先研究了相关性约束运动估值算法,然后提出了基于运动矢量插值的运动估值算法,实验表明新算法的预测性能明显比传统块匹配运动估值算法(BMA)好,而且预测图象的主观质量得到显著改善。 相似文献
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Xue Xiangyang Wu Lide 《电子科学学刊(英文版)》1998,15(1):22-28
A modified block matching algorithm (BMA) with motion correlation constraint (MCCBMA) is proposed at first. Then a novel motion compensation algorithm (INTPMC) which computes motion vector for each pixel by interpolating motion vectors is presented. In order to increase interframe prediction performance and decrease the computational complexity, an optimizing algorithm for partial motion vectors is described at last. Experimental results show that the proposed algorithm can improve the prediction performance obviously with a moderately increased complexity compared with the conventional full search block matching algorithm (FSBMA). 相似文献
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基于运动矢量场和方向自适应的快速运动估计算法 总被引:5,自引:0,他引:5
该文提出了一种基于运动矢量场和方向自适应的快速搜索算法。算法针对序列图像的运动矢量场所具有的中心偏置性和时空相关性进行预判,对静止块设定阈值直接中止搜索;根据运动类型自适应选择搜索起始点和搜索策略;采用了两种新的混合搜索方法,对小运动和大运动宏块使用线性-菱形搜索,对中等运动块使用六边形-菱形搜索算法,搜索模板具有强烈的方向特性。实验结果表明,该文算法的搜索速度和搜索精度优于现有的快速运动估计算法,而搜索精度非常接近于全搜索法。 相似文献
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Yong-Ren Huang Chung-Ming Kuo Feng-Chung Huang 《Journal of Visual Communication and Image Representation》2005,16(6):668
In the past few years, motion compensation has been widely used in the coding of image sequences. Most of motion estimation and compensation schemes belong to block-based framework. The framework simplifies the complexity of motion estimation, but gives over constraints to the motion field, which results in worse accuracy on the boundary of moving objects. This paper presents a novel technique for raising motion field accuracy. It uses several pre-defined pattern types to segment the motion fields of the previous frame of a sequence. The segmentation is based on the MAP framework that uses iterative method to obtain the solution. In addition, we develop a predictive scheme to predict the location of motion field discontinuities in the current frame, which further reduces the side information for the representation of segmentation. 相似文献
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Cheolkon Jung L.C. JiaoMaoguo Gong 《AEUE-International Journal of Electronics and Communications》2012,66(3):235-238
We provide a new motion segmentation method in image sequences based on gamma distribution. Motion segmentation is very important because it can be employed for video surveillance, object tracking, and action recognition. The Gaussian mixture model (GMM) has been widely used as a distribution model for motion segmentation. However, we found that the gamma distribution model is more suitable than the GMM for the optical flow based motion segmentation. Experimental results show that the proposed method is very effective in producing accurate motion segmentation results in image sequences. 相似文献
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Aiming at the higher bit-rate occupation of motion vector encoding and more time load of full-searching strategies,a multi-resolution motion estimation and compensation algorithm based on adjacent prediction of frame difference was proposed.Differential motion detection was employed to image sequences and proper threshold was adopted to identify the connected region.Then the motion region was extracted to carry out motion estimation and motion compensation on it.The experiment results show that the encoding efficiency of motion vector is promoted,the complexity of motion es timation is reduced and the quality of the reconstruction image at the same bit-rate as Multi-Reso lution Motion Estimation (MRME) is improved. 相似文献