共查询到20条相似文献,搜索用时 15 毫秒
1.
提出了一种结合深度信息与改进的均值漂移算法相结合的立体视频对象分割方法.首先采用自适应权值的视差估计方法.获得可靠的视差图,然后利用改进的均值漂移算法对视差图进行分割,获取视频对象.实验结果表明,该方法可以获得与语义一致的对象分割. 相似文献
2.
Dornoosh Zonoobi Ashraf A. Kassim Weijia Shen 《Journal of Signal Processing Systems》2009,54(1-3):171-181
Precise segmentation of vasculature from three-dimensional (3D) magnetic resonance angiography (MRA) images is playing an important role in image-guided neurosurgery, pre-operation planning and clinical analysis. Active Contour based evolution algorithms are being widely applied to MRA data sets, however existing approaches exhibit some difficulties in extracting tiny parts of the vessels. Our objective is to develop an automated segmentation scheme to accurately extract vasculature of the brain, especially tiny vessels. Inspired by the intrinsic properties of MRA, we have proposed a scheme called the gradient compensated geodesic active contours (GCGAC), which compensates for low gradients near edges of thin vessels. The GCGAC, which is implemented based on level set, has been tested on both synthetic volumetric image and real 3D MRA images. Our experiments show that the introduced gradient compensation can facilitate more accurate segmentation of tiny blood vessels. 相似文献
3.
In unsupervised video object segmentation(UVOS), the whole video might segment the wrong target due to the lack of initial prior information. Also, in semi-supervised video object segmentation(SVOS), the initial video frame with a fine-grained pixel-level mask is essential to good segmentation accuracy. It is expensive and laborious to provide the accurate pixel-level masks for each training sequence. To address this issue, We present a weak user interactive UVOS approach guided by a simple huma... 相似文献
4.
5.
基于Gabor小波的无边缘活动围道纹理分割方法 总被引:1,自引:0,他引:1
该文提出了一种基于Gabor小波的活动围道纹理分割新方法。该方法先用Gabor小波提取图像的纹理特征,再用Chan-Vese模型进行分割。与其它基于Chan-Vese模型的纹理分割方法相比,基于Gabor小波的活动围道的纹理分割方法有两个优点:一是同时使用纹理特征和灰度信息演化围道,可分割纹理图像和非纹理图像,分割方法的灵活性好;二是在分割多类目标时,采用多级分层式曲线演化方法解决了初始围道难以选择的问题。对自然界真实图像和遥感图像的分割实验结果说明,该文提出的分割方法精度高。 相似文献
6.
7.
8.
一种基于内容的快速视频运动对象分割算法 总被引:1,自引:0,他引:1
自从MPEG-4和MPEG-7标准公布以来。基于内容的视频编码与基于对象形状的检索成为视频领域新的发展趋势,而准确地从背景中分割出视频对象是实现上述功能的前提条件。对视频运动对象分割算法进行了研究,该算法结合对称差分和自适应阚值选取,获得变化检测模板,并最终分割出视频运动对象。实验结果表明该算法对运动对象敏感,能实时准确地分割出视频运动对象。但对象的关节运动以及背景的全局运动都将导致分割精度的降低,这也是今后研究的重点。 相似文献
9.
Automatic Segmentation of Moving Objects in Video Sequences for Indoor and Outdoor Applications 总被引:1,自引:0,他引:1
FALAH E. ALSAQRE 《中国邮电高校学报(英文版)》2003,10(4)
1 IntroductionAutomaticsegmentationofmovingobjectsfromvideosequencesisadifficultandchallengingproblemincomputervisionsystems.Ithasmanyapplicationssuchasvideosurveillance,trafficmonitoring ,peopletrackingandvideocommunication[1~4] .Italsoplaysanimportantroleinsupportingcontent basedimagecoding,especiallyaftertheemergenceofthevideocodingstandardMPEG 4[5~ 1 4 ] .Therearealotofresearchworksonmovingob jectssegmentationandextraction .Thesealgorithmscanberoughlyclassifiedintotwocategories:inter … 相似文献
10.
Variational models have been studied for image segmentation application since the Mumford-Shah functional was introduced in the late 1980s. In this paper, we focus on multiphase segmentation with a new regularization term that yields an unsupervised segmentation model. We propose a functional that automatically chooses a favorable number of phases as it segments the image. The primary driving force of the segmentation is the intensity fitting term while a phase scale measure complements the regularization term. We propose a fast, yet simple, brute-force numerical algorithm and present experimental results showing the robustness and stability of the proposed model. 相似文献
11.
基于信息融合的视频序列图像中运动目标分割的研究 总被引:1,自引:0,他引:1
该文提出一种基于信息融合的方法分割视频序列图像运动目标。在彩色图像分割中,将部分空间信息介入到迭代均值偏移过程,实现无参数聚类。然后利用所提出的求等同标志连通区域的方法,将聚类后的图像划分成不同的独立区域;再利用HOS(高阶统计)方法进行运动检测,经后处理,得到运动目标粗模板。统计这个运动粗模板中等同颜色区域占原图像相应独立区域的比重,比重超过预置阈值的,则将该独立区域作为待融合区域。最后,将所有的待融合区域连接起来,就构成了运动目标模板。 相似文献
12.
13.
In this paper, a novel method for three-dimensional (3D) segmentation and motion estimation based on 3D videos provided by TOF cameras is presented. The problem is formulated by a variational statement derived from the maximum a posterior probability (MAP) using 3D Optical Flow Constraint, containing both evolution surface and motion parameters. Therefore, the proposed method allows them to benefit from each other and perform motion segmentation and estimation simultaneously. All the formulation is under the assumption that environmental objects are rigid, and an iterative, PDE-driven level set method is adopted for energy minimization. Various experimental results show the validity of the proposed algorithm. 相似文献
14.
15.
立体视频播放涉及左右眼图像处理,具有数据处理量大、帧匹配要求高的特点.为了实现立体视频的实时显示,提出了实现左右格式视频画面融合的方法.在分析视频帧数据存储方法的基础上,研究使用FFmpeg视频处理方法,开发播放器主体结构,利用立体视频融合算法实现立体视频播放. 相似文献
16.
1IntroductionInthelastfewyears,n'ovelandverydemandingapplications,suchasdesktopvideoconferencing,videophone,multimediacommunicationsandmobilecommunications,havegivenarenewedimpetustoresearchintheareaofverylowbit-ratevideocoding.Establishedvideocodingstandards,suchasH.261andMPEG-2,performratherpoorlywhenusedforhighcompressionratios.Themaininherentdeficiencywiththeseblock-basedapproachesisthatthevideosceneandmotionaremodeledasbeingcomprisedofsquareblocks.Thus,atverylowbitrates,thereconstructed… 相似文献
17.
从立体电视技术链的角度出发,首先分析了立体电视双目视差基本原理,然后分析了立体电视在视频采集制作、发端压缩编码、信道传输、收端解码和立体显示这5大环节中,现行技术对立体视频质量分别造成的影响以及已有的改进措施,最后展望了最新立体电视技术对于立体视频质量的提升。 相似文献
18.
遥感模糊图像分割与像元分析 总被引:6,自引:0,他引:6
卫星遥感对地观测获取的图像信息其像元的数据往往是多种地表成分的复合,因此地表反射辐射反映在像元上带有一定的模糊性,基于模糊数学的理论和方法,同时利用了TM(1,2,3,4,5,7)六个波段的数据信息,对一幅图像进行非监督分割,并用模糊算法对单个像元所隶属的各聚类中心的成分进行了数值分析,结果显示出尽管分割后一些像元属同一类别,但其复合成分则不尽相同,该方法对于TM像元分析精度的可靠性有待地面工作的 相似文献
19.
卫星遥感对地观测获取的图像信息其像元的数据往往是多种地表成分的复合,因此地表反射、辐射反映在像元上就带有一定的模糊性。基于模糊数学的理论和方法,同时利用了TM(1,2,3;4,5,7)对六个波段的数据信息,对一幅图像进行非监督分割,并用模糊算法对单个像无所隶属的各聚类中心的成分进行了数值分析。结果显示出尽管分割后一些像元属同一类别,但其复合成分则不尽相同。该方法对于TM像无分析精度的可靠性有待地面工作的进一步验证。 相似文献
20.
图像分割是数字图像处理的一项重要内容.本文将基于高斯混合模型的退火EM算法应用于非监督图像分割.由于退火EM算法具有自动探测数据中类别数的功能,通过使用退火EM算法则能够在图像中自动确定其对象的个数,并得到较好的分割结果.实验表明,应用退火EM算法进行图像分割是可行、有效的. 相似文献