Advanced feature extraction for keyblock-based image retrieval

Keyblock, which is a new framework we proposed for content-based image retrieval, is a generalization of the text-based information retrieval technology in the image domain. In this framework, keyblocks, which are analogous to keywords in text document retrieval, can be constructed by exploiting the vector quantization method which has been used for image compression. Then an image can be represented as a code matrix in which the elements are the indices of the keyblocks in a codebook. Based on this image representation, information retrieval and database analysis techniques developed in the text domain can be generalized to image retrieval. In this paper, we present new models named n-block models which are the generalization of the n-gram models in language modeling to extract comprehensive image features. The effort to capture context in a text document motivated the n-gram models. Similarly, the attempt to capture the content in an image motivates us to consider the correlations of keyblocks within an image. By comparing the performance of our approach with conventional techniques using color feature and wavelet texture feature, the experimental results demonstrate the effectiveness of these n-block models.     

综合颜色纹理形状特征的图像检索

图像特征的提取和使用在基于内容的图像检索中至关重要.研究了在基于内容的图像检索系统中整合颜色,纹理,形状的提取方法.将图像按照一定的规则进行分块,对各个分块分别进行各种特征向量的提取.颜色特征的提取是基于YUV颜色空间的颜色直方图,纹理特征的提取采用Gabor滤波器,形状特征的提取是基于Zernike矩的计算.实验结果表明,综合图像的颜色、形状和纹理特征提高了图像检索的准确性.     

Face image retrieval based on shape and texture feature fusion

Computational Visual Media - Humongous amounts of data bring various challenges to face image retrieval. This paper proposes an efficient method to solve those problems. Firstly, we use accurate...     

Adaptive tetrolet based color,texture and shape feature extraction for content based image retrieval application

Multimedia Tools and Applications - The performance of any content-based image retrieval (CBIR) system depends on the quality and importance of the extracted features. Those extracted features like...     

Efficient transform-based texture image retrieval techniques under quantization effects

With the great demand for storing and transmitting images as well as their managing, the retrieval of compressed images is a field of intensive research. While most of the works have been devoted to the case of losslessly encoded images (by extracting features from the unquantized transform coefficients), new studies have shown that lossy compression has a negative impact on the performance of conventional retrieval systems. In this work, we investigate three different quantization schemes and propose for each one an efficient retrieval approach. More precisely, the uniform quantizer, the moment preserving quantizer and the distribution preserving quantizer are considered. The inherent properties of each quantizer are then exploited to design an efficient retrieval strategy, and hence, to reduce the drop of retrieval performances resulting from the quantization effect. Experimental results, carried out on three standard texture databases and a color dataset, show the benefits which can be drawn from the proposed retrieval approaches.     

沉浸式环境下数字图像的两相流纹理特征提取

数字图像的应用范围逐渐扩大,在对其研究后发现两相流纹理是影响图像应用效果的重要因素之一,为对其进行更好的控制,需要使用提取方法获取此纹理特征.但目前使用的纹理特征提取方法由于图像分割效果较差,导致其提取查全率较低.因此,设计沉浸式环境下数字图像的两相流纹理特征提取方法.构建图像预处理环节,对原始图像展开灰度图像处理、滤...     

小波-轮廓波纹理图像检索系统

针对轮廓波检索系统检索率较低、检索速度较慢等问题,提出一种小波-轮廓波纹理图像检索系统。该系统在最细节尺度子空间采用轮廓波变换,而在其他子空间采用小波变换,以变换域子带系数的能量和标准偏差序列作为特征向量,Canberra距离为相似度标准。采用Brodatz纹理数据库中的109幅640×640的纹理图像为实验对象,比较了基于同样架构的轮廓波变换和小波-轮廓波纹理检索系统的性能。实验结果表明：后者具有较高的检索率、较快的检索速度和较少的特征向量数据库存储空间。     

基于双树复小波域统计图像建模的纹理特征提取

统计图像建模方法使用某种参数控制的分布模型来描述纹理及其特征,即参数估计是该类方法的核心问题.鉴于此,提出一种新的纹理特征提取方法,利用广义伽马分布和广义冯cdot米塞斯分布在图像的双树复小波域上进行统计建模,利用对数累积量法进行高效的参数估计完成纹理特征提取.在VisTex和Brodatz纹理库上进行分类实验,结果表明所提方法能够有效捕获图像的纹理特征,获取较高的识别率.     

基于SVM算法和纹理特征提取的遥感图像分类

遥感图像分类是遥感图像处理领域中的一个重要的研究方向,传统的遥感图像分类方法根据像素值进行分类,忽视了遥感影像中丰富的纹理特征信息.小波分析通过引入宽度可变的窗口,可以同时对信号的局部信息进行频率域和时间域的变换.小波分析算法可以有效地提取出图像中的纹理特征信息.支持向量机算法是20世纪90年代提出的一种新的机器学习算法,通常被用来进行模式识别和分类.结合小波纹理提取算法,利用支持向量机进行遥感图像分类.研究结果表明,结合纹理特征的支持向量机分类的效果优于直接对灰度图像进行分类.     

Scale-orientation histogram for texture image retrieval

In this paper, a Scale-orientation histogram is defined for analyzing the “directionality” and “periodicity”, which are two of the most important deterministic dimensions in human texture perception. This histogram is applied to texture retrieval in a case study, and the experimental results illustrate its effectiveness.     

Decorrelation methods of texture feature extraction

This paper presents the development and evaluation of a visual texture feature extraction method based on a stochastic field model of texture. Results of recent visual texture discrimination experiments are reviewed in order to establish necessary and sufficient conditions for texture features that are in agreement with human discrimination. A texture feature extraction technique involving autocorrelation function measurement of a texture field, combined with histogram representation of a statistically decorrelated version of the texture field, is introduced. The texture feature extraction method is evaluated in terms of a Bhattacharyya distance measure.     

Contourlet-1.3纹理图像检索系统

针对轮廓波变换纹理图像检索系统检索率较低的问题,提出了一种基于较强抗混叠能力的Contourlet-1.3纹理图像检索系统。该系统采用的Contourlet-1.3变换由抗混叠临界下采样拉普拉斯金字塔级联临界下采样方向滤波器构成,特征向量采用变换域子带系数的能量和标准偏差连接而成,以Canberra距离为相似度度量标准。实验结果表明：在特征向量长度、检索时间、所需存储空间基本相同的情况下,基于抗混叠Contourlet-1.3的检索系统比相同架构的轮廓波变换、无下采样轮廓波变换以及Contourlet-2.3检索系统具有更高的检索率;该检索系统中抗混叠Contourlet变换分解结构参数的选择对于检索率也有较大影响。     

基于纹理特征提取的图像分类方法研究及系统实现*

深入研究灰度共生矩阵算法,结合和差统计法对其进行改进。编码实现改进的图像纹理提取算法,并采用基于径向基内积函数内核的支持向量机方法对图像分类效果进行实验。通过训练和测试证明,该系统能减少特征提取的计算时间和存储空间,并可达到良好的图像分类效果     

基于多边形近似的图像纹理全局特性研究

使用传统的MRF模型进行纹理合成时存在无法把握纹理全局特性的缺陷,对具有大规模结构特性的纹理进行合成时,容易造成纹元周期性混乱。将特征匹配的方法引入传统MRF模型中可改良图像合成效果。详细分析了特征点识别与定位对整个纹理合成的作用。首次提出了一种用基于二进制具有量子行为的粒子群算法的多边形近似来分析纹理图像中特征点分布的结构模式分析方法。该方法可以提取结构性及半结构性半随机性纹理中的特征点分布规律,采用对特征点分级的方法定位纹理的大规模乃至全局特性。     

基于纹理的旋转不变图像检索算法的研究

提出一种基于Gabor变换的旋转不变多尺度广义粗糙度特征向量并结合自适应加权距离进行纹理图像检索的方法。利用图像Gabor分解的幅度谱,依据多尺度空间局部能量分布、Hurst分形指数、方向差别来计算纹理特征向量,最后采用自适应加权的街区距离作为相似性准则。仿真结果表明,该算法对旋转纹理图像取得了很好的检索结果。     

Integrating salient colors with rotational invariant texture features for image representation in retrieval systems

Multimedia Tools and Applications - Content based image retrieval (CBIR) systems allow searching for visually similar images in large collections based on their contents. Visual contents are...     

A simple texture feature for retrieval of medical images

Multimedia Tools and Applications - Texture characteristic is an important attribute of medical images, and has been applied in many medical image applications. This paper proposes a simple...