基于相似性和统计性的超像素的图像分割

为了解决超像素图像分割的过分割问题,提出了一种基于超像素区域颜色直方图相似性和统计特性的合并判断准则,用来合并超像素图像分割的区域。该合并准则将超像素分割结果作为区域合并的基本单元,利用基本单元的颜色相似性、空间距离大小和统计特性进行区域合并,以解决超像素图像分割中存在的过分割问题。仿真实验结果表明,该方法能有效地改善超像素过分割问题,并且用于评价分割算法的概率Rand指数和信息变化指数都有所提高。     

基于分析的图像有意义区域提取

提出一种基于对图像的分析，根据图像特点采取不同方法进行图像有意义区域粗略提取的新方案。该方案的特点是无监督和自适应，在分析图像聚类孤立性参数和粗糙度参数的基础上，分别采用色度直方图阈值分割、纹理和色度密度函数聚类、亮度和色度密度函数聚类等不同算法。对真实图像进行区域提取和将其用于语义图像检索的实验效果表明该方案可满足实际要求。     

一种基于规则的脑组织磁共振图像分割新方法

本文将小波算法、分水岭算法及基于区域的模糊C均值算法相结合,提出了一种基于规则的二次分割方法实现对脑组织磁共振图像的分割。首先,采用一种基于小波的滤波嚣去除图像中的噪声;然后采用分水岭算法实现对图像的初始分割。为克服分水岭算法的过度分割问题,本文提出了基于区域的模糊C均值（RFCM）聚类算法实现对过度分割区域的合并。尽管分水岭算法存在过度分割现象,仍有一些区域分割得并不完全,尤其是在脑脊液与灰质,或灰质与白质的过渡区域。为此,本文提出一种局部区域连续性与全局信息相结合的基于规则的多阈值分割方法,对分水岭算法初始分割不完全的区域再次分割。通过对大量模拟数据和真实数据分割的实验证明了此方法的准确性和可靠性。     

基于改进分水岭变换的矿石图像分割算法

为了准确测量传送带上的矿石尺寸,提出了一种局部自适应阈值化和改进的分水岭变换相结合的矿石图像分割算法.该算法利用基于积分图像的自适应阈值化算法提取矿石区域;对二值图像做距离变换与双边滤波处理,并应用提出的基于区域合并的分水岭变换算法对图像进行分割;将提取的矿石区域与分割结果进行合并,得到最终的分割结果.对现场采集的复杂的矿石图像进行仿真实验,实验结果表明,该算法分割准确、速度快、光照自适应强.     

基于熵率超像素和区域合并的岩屑颗粒图像分割

针对岩屑颗粒密集和颗粒表面纹理复杂的特点,提出一种基于熵率超像素分割和区域合并的分割方法。熵率超像素分割将图像分为一系列紧凑的、具有区域一致性的区域,不仅边缘定位准确且降低图像计算的复杂度;针对存在的过分割情况,提出一种结合颜色直方图和形状信息的合并准则,进行基于RAG结构的快速区域合并,得到最后分割结果。实验结果表明,将该方法用于岩屑颗粒图像分割,能够取得较好的实验效果。     

基于暗原色和直方图匹配的雾天图像增强算法

针对雾天图像景物容易退化的问题,提出一种基于暗原色和插值直方图匹配的雾天图像自适应增强算法。该算法基于暗原色先验信息寻找并分割出图像中的天空区域,利用插值直方图匹配方法对非天空区域进行自适应增强处理,采用主成分分析方法将处理前后的图像信息进行融合。实验结果表明,该算法不仅能避免天空噪声对图像的干扰,而且能有效提高图像对比度,获得满意的图像视觉效果。     

一种主特征量自适应选择的多彩色空间图像分割方法研究

本文提出了一种基于多彩色空间自适应图像分割算法，在HSL和RGB空间通过平滑直方图至单峰，自适应地确定分割的主要特征量，再根据区域的邻接关系和色调距离进行区域合并，从而实现对图像的较好分割。     

基于视觉显著性的非监督图像分割

交互式的图像分割算法需要用户输入先验信息,从而增加了算法的时间复杂度和用户的负担。提出了基于视觉显著性的非监督图像分割算法。该算法首先通过均值漂移算法先对图像进行预处理,将图像过分割成互不重叠的小区域。这些区域采用区域邻接图表示,当两个区域相邻时对应的节点之间存在边。其次,通过计算各个区域的颜色相异性和纹理一致性,得到相邻区域之间的合并概率。再次,根据区域的颜色和空间位置信息,定义每一个区域的显著性指标,选择最大显著性指标对应的区域作为目标种子区域,图像边缘区域中显著性指标最小的区域作为背景种子区域。最后,基于最大相似性合并策略,对与种子区域相邻的且合并概率最大的区域进行合并。实验表明,所提算法 不需要先验信息,且可以得到较好的分割效果;与非监督图像分割算法相比,所提算法可以避免过分割。     

粗糙集与区域生长的烟雾图像分割算法研究

针对图像型火灾烟雾分割算法不能同时提取白色、灰白色和黑色烟雾的问题,提出了一种粗糙集和区域生长法相结合的烟雾图像分割算法。在RGB颜色空间提取图像的R分量,根据R分量的统计直方图构造粗糙度直方图,选取粗糙度直方图中合适的波谷值作为分割阈值,对图像进行粗分割。相对背景图像,烟雾属于运动信息,采用帧间差分法提取运动区域,排除静态干扰。烟雾具有独特的颜色特征,在RGB颜色空间建立烟雾颜色模型,去除颜色相近的运动干扰,获得疑似烟雾区域。在该区域内选择种子点,在粗糙集粗分割的结果上进行区域生长,提取出烟雾区域。实验结果表明,该算法能够同时分割出白色、灰白色和黑色烟雾,烟雾边缘不规则信息保存比较完整,与已有算法的平均分割准确率、召回率以及F值相比,分别提高了19%、21.5%、20%。     

基于快速Level Set的红外图像分割方法

针对传统红外图像分割算法精度差以及单纯基于边界信息或区域信息Level Set的图像分割算法实时性差等问题，提出了一种同时基于边界信息和区域信息的快速Level Set的红外图像分割算法。通过自适应系数T1和T2很好地将边界信息和区域信息相结合，在保证分割精度的同时加快了图像分割速度。通过实验仿真并与其他红外图像分割算法结果比较，证明了该算法的有效性和实时性。     

基于K均值聚类与区域合并的彩色图像分割算法

提出一种基于K均值聚类与区域合并的彩色图像分割算法。首先,对图像运用mean shift算法进行滤波,在对图像进行平滑的同时保持图像的边缘;然后,运用K均值算法对图像在颜色空间进行聚类,得到初始分割的结果;最后,给出了一种区域合并策略,对初始分割获得的区域进行合并,得到最终的分割结果。仿真结果表明,算法的分割结果和人的主观视觉感知具有良好的一致性。     

基于均匀性图分水岭变换及两步区域合并的彩色图像分割

提出了一种基于分水岭的彩色图像分割算法。首先采用同类组滤波技术对彩色图像进行保边缘的平滑,结合梯度图和二阶矩图提取一种反映了图像更精细局部信息的均匀性图,然后利用经典分水岭算法进行初始分割,分别就区域面积和Fisher距离分两步进行区域合并,结合信息损失和区域数目关系导出的颜色散度增量作为自动终止合并的策略。实验结果表明了该算法的有效性。     

一种融合颜色和空间信息的彩色图像分割算法

提出了一种基于图像颜色和空间信息的彩色图像分割算法.该算法首先根据所提出的颜色粗糙度概念对图像进行颜色量化,并在此基础上使用增量式的区域生长算法发现颜色相近的像素之间的空间连通性,形成图像的初始分割区域.然后,根据融合了颜色和空间信息的区域距离,对初始分割区域进行分级合并,直到系统满足了所提出的停止区域合并的准则.最后,利用形态学的有关算法对分割区域的边缘进行平滑.实验证明,算法的分割结果与人的主观视觉感知具有良好的一致性.     

Application of Superpixels to Segment Several Landmarks in Running Rodents

Examining locomotion has improved our basic understanding of motor control and aided in treating motor impairment. Mice and rats are the model system of choice for basic neuroscience studies of human disease. High frame rates are needed to quantify the kinematics of running rodents, due to their high stride frequency. Manual tracking, especially for multiple body landmarks, becomes extremely time-consuming. To overcome these limitations, we proposed the use of superpixels based image segmentation as superpixels utilized both spatial and color information for segmentation. We segmented some parts of the body and tested the success of segmentation as a function of color space and SLIC segment size. We used a simple merging function to connect the segmented regions considered as a neighbor and having the same intensity value range. In addition, 28 features were extracted, and t-SNE was used to demonstrate how much the methods are capable to differentiate the regions. Finally, we compared the segmented regions to a manually outlined region. The results showed for segmentation, using the RGB image was slightly better compared to the hue channel. For merging and classification, however, the hue representation was better as it captures the relevant color information in a single channel.     

Spatial color histogram-based image segmentation using texture-aware region merging

We propose a new image segmentation method using spatial-color histograms that include the color and spatial information of a given image. Previous methods used a histogram with only the color information of the image or did not effectively suppress the texture components of the same object to form segmented regions, and they frequently led to the false merging of two different regions. Thus, these methods caused an over-segmentation result in the same object or an under-segmentation result in the regional boundary between two different objects. To resolve these problems, the proposed method performs a clustering that considers both color and spatial information of the image in the histogram domain and texture-aware region merging. Moreover, using a total variation-based regularizer that can remove the texture components in the same object and preserve the edge components between different objects, we improve the accuracy of region merging process that is applied to the result of the proposed histogram-based segmentation. Compared to the best results obtained using previous histogram-based methods, the proposed method achieved improvements of 0.02335 (2.910%), 0.0195 (3.977%), 0.05515 (2.431%), and 0.9639 (9.250%) in probability rand index, segmentation covering, variation of information, and boundary displacement error, which are the most widely used for segmentation evaluation metrics, respectively. Further, when compared to the state-of-the-art methods, which use the superpixel, iterative contraction and merging, and deep learning-based methods, the proposed method provides promising segmentation quality with fast operation speed.

     

结合粗糙集与分层思想的彩色图像分割算法

针对彩色图像分割算法中小目标区域容易错分割以及计算复杂度高的问题,提出一种基于HSI空间的结合粗糙集理论与分层思想的彩色图像分割方法。首先,由于彩色图像HSI空间的奇异点对应于RGB空间的灰色像素点,为了消除奇异点,在RGB空间寻找"灰色区域"进行分割与标记;然后,将图像转换到HSI颜色空间,在强度I分量上,考虑到空间邻域信息以及区域分布差异,设计了变阈值渐变性同质函数对原始直方图进行加权,将加权直方图和原始直方图分别作为粗糙集的上、下近似集,构造了新的粗糙度函数进行分割;其次,针对初分割得到的每个区域,在色调H分量上采用直方图阈值化完成细分割;最后,为了避免过分割,在RGB空间上进行区域合并。相比Mushrif等提出的粗糙集分割算法(MUSHRIF M M, RAY A K. Color image segmentation: rough-set theoretic approach. Pattern Recognition Letters, 2008, 29(4): 483-493),该算法更容易分割出图像中的小目标区域,避免了因RGB三个分量的相关性造成的错误分割,算法运行速度提高了5~8倍。实验结果表明:该算法分割效果较好,具有一定的抗噪性与鲁棒性。     

遥感图像多尺度分割算法与矢量化算法的集成

在遥感图像处理和分析软件中,图像分割/分类和矢量化是前后独立的过程:先分割/分类,再矢量化整幅图像。由于矢量化后得到的矢量文件未写入图像对象(区域、图斑)的特征信息,只能用于显示而不能用于后续操作。此外,处理复杂图像时还存在矢量文件多边形数目与分割/分类后图像区域数目不一致的问题。为此,将多尺度分割算法与矢量化算法进行一体化集成。对遥感图像进行多尺度分割得到图像对象链表,逐个对图像对象做矢量化处理,同时把特征统计信息写入多边形属性中。集成后不仅可保证矢量多边形数目与图像对象数目完全一致,而且由于特征统计信息已作为多边形区域的属性保存在多边形中,后续的多尺度分割、区域合并、空间关系操作等均可基于矢量多边形进行。     

An integrated approach for scene understanding based on Markov Random Field model

In this paper, we propose a Markov Random Field model-based approach as a unified and systematic way for modeling, encoding and applying scene knowledge to the image understanding problem. In our proposed scheme we formulate the image segmentation and interpretation problem as an integrated scheme and solve it through a general optimization algorithm. More specifically, the image is first segmented into a set of disjoint regions by a conventional region-based segmentation technique which operates on image pixels, and a Region Adjacency Graph (RAG) is then constructed from the resulting segmented regions based on the spatial adjacencies between regions. Our scheme then proceeds on the RAG by defining the region merging and labeling problem based on the MRF models. In the MRF model we specify the a priori knowledge about the optimal segmentation and interpretation in the form of clique functions and those clique functions are incorporated into the energy function to be minimized by a general optimization technique. In the proposed scheme, the image segmentation and interpretation processes cooperate in the simultaneous optimization process such that the erroneous segmentation and misinterpretation due to incomplete knowledge about each problem domain can be compensately recovered by continuous estimation of the single unified energy function. We exploit the proposed scheme to segment and interpret natural outdoor scene images.     

融合色调统计特征的自适应区域增长算法

针对区域增长算法种子点选取及生长条件对分割效果影响大,但难以有效、准确确定的缺点,提出了一种融合色调、色调频度及其曲率的自适应区域增长算法(HARG)。通过曲率求取分割对象的色调频度曲线峰值,以峰值为中心进行加窗累加,当和值满足门限时,峰值作为区域增长的种子点,门限作为区域增长的生长条件。将算法应用于显微镜细胞图像的单个细胞内部分割,实验结果表明,HARG算法自适应确定了种子点及生长条件,能够实现多区域分割,分割精度得到改善。     

Connectivity-based local adaptive thresholding for carotid artery segmentation using MRA images

The computer algorithms for the delineation of anatomical structures and other regions of interest on the medical imagery are important component in assisting and automating specific radiological tasks. In addition, the segmentation of region is an important first step for variety image related application and visualization tasks. In this paper, we propose a fast and automated connectivity-based local adaptive thresholding (CLAT) algorithm to segment the carotid artery in sequence medical imagery. This algorithm provides the new feature that is the circumscribed quadrangle on the segmented carotid artery for region-of-interest (ROI) determination. By using the preserved connectivity between consecutive slice images, the size of the ROI is adjusted like a moving window according to the segmentation result of previous slice image. The histogram is prepared for each ROI and then smoothed by local averaging for the threshold selection. The threshold value for carotid artery segmentation is locally selected on each slice image and is adaptively determined through the sequence image. In terms of automated features and computing time, this algorithm is more effective than region growing and deformable model approaches. This algorithm is also applicable to segment the cylinder shape structures and tree-like blood vessels such as renal artery and coronary artery in the medical imagery. Experiments have been conducted on synthesized images, phantom and clinical data sets with various Gaussian noise.