一种基于中轴探测的运动模糊方向估计方法

针对运动模糊图像的模糊方向估计易受频谱中心十字亮线和图像尺寸影响的问题,详细分析了匀速直线运动模糊图像的退化模型。通过对点扩散函数的公式推导,找到了图像尺寸与模糊方向间的关系,提出了一种基于中轴探测的运动模糊方向估计方法。该方法首先对模糊图像进行傅里叶变换及动态压缩得到频谱图,然后对频谱图进行预处理,以消除中心十字亮线的影响,最后根据推导出的公式计算得到运动模糊方向的估计。仿真实验表明,该方法简单、准确,克服了图像长宽比对估计结果的影响,且具有较强的鲁棒性和较高的时间效率。     

一种运动模糊图像的复原法

被摄物与相机之间的相对运动往往会造成图像的运动模糊，给图像的识别带来不便。为了恢复这些模糊图像，文中提出了一种运动模糊图像的复原法。它利用了双线性插值及模糊方向上微分图像灰度值(绝对值)之和最小的方法来求出运动模糊的方向，其次运用传播波方程对任意方向上的匀速直线运动模糊进行恢复。将此方法应用于一个具体的实例当中，发现效果明显，由此可看出此方法是十分有效的。     

一种运动模糊图像的复原法

被摄物与相机之间的相对运动往往会造成图像的运动模糊,给图像的识别带来不便.为了恢复这些模糊图像,文中提出了一种运动模糊图像的复原法.它利用了双线性插值及模糊方向上微分图像灰度值(绝对值)之和最小的方法来求出运动模糊的方向,其次运用传播波方程对任意方向上的匀速直线运动模糊进行恢复.将此方法应用于一个具体的实例当中,发现效果明显,由此可看出此方法是十分有效的.     

一种运动模糊图像的鲁棒运动估计策略

研究运动模糊图像的运动估计问题,提出基于泊松融合技术的运动估计策略。该策略将运动模型作为泊松融合技术的局部约束,实现最优运动求解。在此基础上,以直线和旋转运动模糊图像为例,提出相应的运动参数模型和估计方法。实验结果表明,所提出的策略可以较准确地估计模糊运动。     

图像的运动模糊复原技术研究

由于成像系统与地面目标的相对运动,在目标图像上产生运动模糊,图像复原技术可以消除图像模糊.介绍两种模糊图像的恢复方法,根据匀速直线运动造成的图像模糊的特点,建立原始图像与模糊图像间的关系,在此基础上分析匀速模糊图像的退化及恢复过程,山此推出相关的数学模型,试验结果证明了方法的有效性.     

一种旋转平移运动模糊单帧图像恢复方法

成像传感器与目标景物之间有相当大的相对旋转角度和平移距离,经常会造成自然图像的运动模糊效应,为恢复旋转平移运动模糊图像,探讨了一种旋转平移运动模糊单帧图像恢复方法。     

一种新的运动模糊图像恢复方法

通过对运动模糊产生原因的分析,提出了一种去运动模糊的新方法。首先应用Hough变换和自相关函数估计出运动模糊的方向和长度,然后应用迭代步长自适应的整体变分模型进行图像恢复。实验结果表明,这样的空间域处理方法,不但可以避免传统的频率域去模糊方法产生的震铃效应,而且该方法具有良好的抗噪性和对运动模糊参数估计误差的低敏感性。     

航空图像运动模糊的快速恢复

根据运动模糊图像的特点,建立了原始图像与模糊图像之间的关系,采用了一种快速图像复原的算法,实现了对图像的快速恢复,得到较好的效果。     

一种新的针对星空图像的模糊复原方法

在拍照过程中,针对相机和星空场景的相对运动而导致的图像模糊问题,提出一种新的针对星空图像的运动模糊复原算法。首先采用一种改进的细化算法得到星空图像的星点运动轨迹,从而提取出星空运动模糊图像的模糊核,然后基于Richardson-Lucy的复原算法对模糊图像进行复原。实验结果表明,本文提出的利用细化算法得到模糊核的方法复杂度低、耗时少且准确性高,对星空图像的运动模糊具有很好的复原效果。     

相向运动径向模糊图像的复原算法研究

当摄像机在高速靠近或远离目标过程中成像时,所得目标图像会产生从中心到边缘的放射状径向模糊,从而影响对目标的识别与跟踪。首先建立了理想情况相向运动条件下图像模糊退化的数学模型,通过对模型的深入分析,确定了影响模糊程度的主要模型参数,然后模拟出与实际成像一致的仿真图像,并严格推导出图像复原的递推公式,最后通过对径向模糊仿真图像的复原验证了该公式的正确性。     

Interactive motion photography from a single image

In this paper, we present an interactive and computational method of creating a motion photograph from a single image. Inspired by cartoon arts, a motion photograph is a still image in which moving objects are depicted as informative and motion-evocative. With a still image that contains moving objects, the user can add and edit various motion effects by a simple but efficient user interface. As a result, the edited object conveys an effective motion effect without blurring the object. The proposed system is so user-friendly that novices can create motion photographs without any special skills. Furthermore, the extensible nature of the system means that new effects can be developed and plugged in. The experimental results and user study show that the proposed motion photography system can produce a variety of interesting motion photographs. Compared with general image editing tools (such as Photoshop), the proposed system can create high-quality motion photographs in a significantly shorter time.     

有效去除图像混合噪声的方法

脉冲耦合神经网络PCNN具有良好的脉冲传播特性,可以用于图像的边缘检测;多级中值滤波是对中值滤波的改进,具有较好的保护图像细节的作用;均值滤波是一种成熟的能较好滤除图像高斯噪声的方法.该算法充分结合上述3种算法的优点,先运用PCNN算法对被混合噪声干扰的图像进行边缘检测,然后利用多级中值滤波和均值滤波方法进行滤波处理.对不同的混合噪声进行滤除的实验结果表明本文算法较中值滤波和均值滤波方法有较大提升.     

一种用于图像匹配识别的高斯—脉冲混合噪声去除方法

简要分析了无人机所拍摄数字图像中噪声的产生原因与数学分布模型,结合图像匹配的实际需求,提出了一种高斯—脉冲噪声混合噪声去除方法,并采用ASIFT匹配算法对提出去噪方法的实际应用效果进行检验。该方法首先采用自适应中值滤波方法去除图像中的脉冲噪声,然后采用OWT SURE—LET算法去除图像中的高斯白噪声。实验结果表明:该算法不仅运算时间更短,而且图像匹配效果稳定。     

单幅图象去运动模糊的新方法

由相机抖动引起的图象退化是一种常见现象,由于退化函数和隐藏图象均未知所以对单幅模糊图象进行恢复具有很大难度。介绍了一种新的模糊核估计方法和贝叶斯最小均方误差采样反卷积算法,提出了一种同时具有该模糊核估计和贝叶斯最小均方误差采样算法功能的单幅图象去运动模糊方法,并使用由相机抖动引起的运动模糊图象进行了实验验证和分析,实验结果表明,该方法恢复结果中保留了图象重要边缘信息,振铃失真很少,视觉效果较好。     

Blurred image restoration: A fast method of finding the motion length and angle

Motion blur in photographic images is a result of camera movement or shake. Methods such as Blind Deconvolution are used when information about the direction and size of blur is not known. Restoration methods, such as Lucy and Richardson or Wiener reconstruction use information about the direction and size of the blur in the deconvolution kernel (called Point Spread Function — PSF). Correct and fast determination of the direction and size of blur improves the quality of restoration and it can substantially reduce the computational time. In this article, a fast method for finding the direction and size of the blur automatically is presented. The method is based on computation of the power spectrum of the image gradient in the frequency domain. The method has achieved good results on both types of images: artificially blurred and naturally blurred (by the camera shake).     

An adaptive image feature matching method using mixed Vocabulary-KD tree

Multimedia Tools and Applications - This paper proposes an adaptive scale-invariant feature matching method based on data clustering, to solve the problem of low robustness of the KD tree matching...     

A three-frame algorithm for estimating two-component image motion

A fundamental assumption made in formulating optical-flow algorithms, that motion at any point in an image can be represented as a single pattern component undergoing a simple translation, fails for a number of situations that commonly occur in real-world images. An alternative formulation of the local motion assumption in which there may be two distinct patterns undergoing coherent (e.g. affine) motion within a given local analysis region is proposed. An algorithm for the analysis of two-component motion in which tracking and nulling mechanisms applied to three consecutive image frames separate and estimate the individual components is given. Precise results are obtained, even for components that differ only slightly in velocity as well as for a faint component in the presence of a dominant, masking component. The algorithm provides precise motion estimates for a set of elementary two-motion configurations and is robust in the presence of noise     

Shape and motion from image streams under orthography: a factorization method

Inferring scene geometry and camera motion from a stream of images is possible in principle, but is an ill-conditioned problem when the objects are distant with respect to their size. We have developed a factorization method that can overcome this difficulty by recovering shape and motion under orthography without computing depth as an intermediate step.An image stream can be represented by the 2F×P measurement matrix of the image coordinates of P points tracked through F frames. We show that under orthographic projection this matrix is of rank 3.Based on this observation, the factorization method uses the singular-value decomposition technique to factor the measurement matrix into two matrices which represent object shape and camera rotation respectively. Two of the three translation components are computed in a preprocessing stage. The method can also handle and obtain a full solution from a partially filled-in measurement matrix that may result from occlusions or tracking failures.The method gives accurate results, and does not introduce smoothing in either shape or motion. We demonstrate this with a series of experiments on laboratory and outdoor image streams, with and without occlusions.