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.     

Integrated color,texture and shape information for content-based image retrieval

Feature extraction and the use of the features as query terms are crucial problems in content-based image retrieval (CBIR) systems. The main focus in this paper is on integrated color, texture and shape extraction methods for CBIR. We have developed original CBIR methodology that uses Gabor filtration for determining the number of regions of interest (ROIs), in which fast and effective feature extraction is performed. In the ROIs extracted, texture features based on thresholded Gabor features, color features based on histograms, color moments in YUV space, and shape features based on Zernike moments are then calculated. The features presented proved to be efficient in determining similarity between images. Our system was tested on postage stamp images and Corel photo libraries and can be used in CBIR applications such as postal services.     

综合颜色和纹理特征的图像检索算法

基于内容的图像检索是当前多媒体信息检索的热点之一。基于内容的图像检索技术是根据对图像内容(特征)的描述和提取,在图像库中找到具有指定内容(特征)的图像。本文对图像颜色特征和纹理特征的提取、相似性度量等基于内容的图像检索的关键技术进行了分析和研究,并在此基础上,提出了一个基于颜色特征和纹理特征的图像检索算法并验证了其有效性。该算法采用HSV颜色空间的直方图作为颜色特征向量,采用灰度共生矩阵的四个纹理特征:能量、熵、惯性矩和相关性构成纹理特征向量,采用欧氏距离进行相似性度量。实验结果表明,该算法实现的系统具有良好的图像检索功能。     

综合颜色、纹理、形状和相关反馈的图像检索*

提出了一种综合颜色、纹理和形状三种特征并进行多层检索的方法;同时,将相关反馈技术融合到算法中,通过调整特征间和特征内的权重来提高检索准确率.实现了一个图像检索原型系统,将不同实验结果进行了比较和分析.实验结果表明,提出的方法具有良好的检索效果.     

颜色、纹理、形状及相关反馈在图像检索中的应用

图像数据库的不断庞大使基于内容的图像检索成为研究热点,目前主要集中于底层特征的相似度匹配。文章重点介绍了颜色特征中的分块主色法,纹理特征中的灰度共生矩阵法和形状特征中的小波变换及不变矩法。在利用单一特征检索的基础上,该文提出了一种综合利用上述三种特征共同进行检索的方法。同时,还将相关反馈技术融合到算法中,通过权值矩阵的正负调整及三种特征系数的调整来提高检索准确率。由实验数据表明,文中的方法是很有效的。     

基于目标区域的语义图像检索

提出了一种基于高层语义的图像检索方法,该方法首先将图像分割成区域,提取每个区域的颜色、形状、位置特征,然后使用这些特征对图像对象进行聚类,得到每幅图像的语义特征向量;采用模糊C均值算法对图像进行聚类,在图像检索时,查询图像和聚类中心比较,然后在距离最小的类中进行检索。实验表明,提出的方法可以明显提高检索效率,缩小低层特征和高层语义之间的“语义鸿沟”。     

基于局部颜色-空间特征的图像语义概念检测

针对基于语义的图像检索系统,提出了一种基于局部颜色-空间特征的图像语义概念检测方法。各种基于颜色、纹理和形状的全局特征都存在着众多信息冗余项和干扰项,而该文提出的局部颜色-空间特征则是利用语义概念层的先验知识进行特征降维后提取出的特征,它能更好地描述图像的语义内容,且具有容易提取、计算复杂度低的优点。实验结果表明,基于局部颜色-空间特征的概念检测方法优于基于全局特征的概念检测方法,将其用于图像检索后的检索精度比采用基于全局颜色特征的方法提高了36.4%。     

语义视频检索的现状和研究进展

概述了图像的可视化特征如颜色、纹理、形状和运动信息,时空关系分析,以及多特征目标提取和相似度量度;分析了视频语义的提取,语义查询、检索;探讨了视频语义检索的性能评估,存在的问题和发展方向。     

基于小波多尺度分析的彩色图像检索方法

多媒体技术的普及和Internet技术的实施导致了大量图像信息的出现，基于文本关键词的传统检索方法已不能适应图像信息检索的要求，这使得基于内容的图像检索技术逐渐成为目前的研究热点。基于内容检索技术中必不可少的关键步骤就是图像特征的提取，其中可提取的特征有颜色、纹理和形状等。但是，由于图像的每种特征只能抓住图像相似性的某一个方面，因此如何能更好地表示图像就成为基于内容图像检索中一个重要的研究方向。针对该问题，提出了一种基于图像颜色和纹理特征的图像检索方法，其中颜色特征采用HSV颜色空间的直方图，纹理特征采用图像小波多尺度表示方法中细节信息的方差统计量，这样就充分利用了颜色的丰富表现性和小波变换的多分辨性及其变换系数的统计特性。通过对不同类型图像使用不同特征组合进行图像检索查准率的对比实验结果表明，这种图像检索方法是行之有效的。     

On size invariance texture image retrieval by fuzzy logic classifier and scattering statistical features

The texture image retrieval plays an important role in everyday life of people. In this paper, a new and efficient image features extraction approach based on scattering transform is proposed for size invariance texture image retrieval. The proposed approach obtains texture information in different directions and scales. And, analysis of size invariance texture image retrieval using fuzzy logic classifier and scattering statistical features is carried out. The different size samples of texture image are randomly generated from the original texture images. Also, average success rate of each size samples is obtained, respectively. The study shows that statistical features can achieve good performance from the sixth feature.     

Vector space model adaptation and pseudo relevance feedback for content-based image retrieval

Image retrieval is an important problem for researchers in computer vision and content-based image retrieval (CBIR) fields. Over the last decades, many image retrieval systems were based on image representation as a set of extracted low-level features such as color, texture and shape. Then, systems calculate similarity metrics between features in order to find similar images to a query image. The disadvantage of this approach is that images visually and semantically different may be similar in the low level feature space. So, it is necessary to develop tools to optimize retrieval of information. Integration of vector space models is one solution to improve the performance of image retrieval. In this paper, we present an efficient and effective retrieval framework which includes a vectorization technique combined with a pseudo relevance model. The idea is to transform any similarity matching model (between images) to a vector space model providing a score. A study on several methodologies to obtain the vectorization is presented. Some experiments have been undertaken on Wang, Oxford5k and Inria Holidays datasets to show the performance of our proposed framework.     

遗传反馈的多特征图像检索

基于内容的图像检索是随着数字多媒体技术的发展和普及而新兴的一门信息检索技术。针对当前该领域存在的对图像描述不准确、查询精度低以及反馈次数较多的问题,提出一种基于遗传反馈的图像检索算法。该算法以遗传算法和相关反馈为基础,利用多特征进行检索,避免在利用单一特征进行检索时所出现的不同图像具有相同单一特征（颜色、纹理和形状等）的问题,对图像进行多特征描述可以从多个角度对图像进行定义,大大减少了不同图像却具有相同特征的概率。与现有的算法相比,其具有自动调整图像特征权重、较低反馈次数和较高查询精度的特性。实验结果表明,该算法对于旋转、平移和尺度变化具有较强的鲁棒性,同时具有减少反馈次数和较高查询精度的性能。     

Analyzing scenery images by monotonic tree

Content-based image retrieval (CBIR) has been an active research area in the last ten years, and a variety of techniques have been developed. However, retrieving images on the basis of low-level features has proven unsatisfactory, and new techniques are needed to support high-level queries. Research efforts are needed to bridge the gap between high-level semantics and low-level features. In this paper, we present a novel approach to support semantics-based image retrieval. Our approach is based on the monotonic tree, a derivation of the contour tree for use with discrete data. The structural elements of an image are modeled as branches (or subtrees) of the monotonic tree. These structural elements are classified and clustered on the basis of such properties as color, spatial location, harshness and shape. Each cluster corresponds to some semantic feature. This scheme is applied to the analysis and retrieval of scenery images. Comparisons of experimental results of this approach with conventional techniques using low-level features demonstrate the effectiveness of our approach.     

Feed-forward content based image retrieval using adaptive tetrolet transforms

This paper proposes a new approach for content based image retrieval based on feed-forward architecture and Tetrolet transforms. The proposed method addresses the problems of accuracy and retrieval time of the retrieval system. The proposed retrieval system works in two phases: feature extraction and retrieval. The feature extraction phase extracts the texture, edge and color features in a sequence. The texture features are extracted using Tetrolet transform. This transform provides better texture analysis by considering the local geometry of the image. Edge orientation histogram is used for retrieving the edge feature while color histogram is used for extracting the color features. Further retrieval phase retrieves the images in the feed-forward manner. At each stage, the number of images for next stage is reduced by filtering out irrelevant images. The Euclidean distance is used to measure the distance between the query and database images at each stage. The experimental results on COREL- 1 K and CIFAR - 10 benchmark databases show that the proposed system performs better in terms of the accuracy and retrieval time in comparison to the state-of-the-art methods.     

Experimental analogy of different texture feature extraction techniques in image retrieval systems

Content based image retrieval (CBIR) is an extrusive technique of retrieving the relevant images from vast image archives by extracting their low level features. In this research paper, the pursuance of five most prominent texture feature extraction techniques used in CBIR systems are experimentally compared in detail. The main issue with the CBIR systems is the proper selection of techniques for the extraction of low level features which comprises of color, texture and shape. Among these features, texture is one of the most decisive and dominant features. This selection of features completely depends upon the type of images to be retrieved from the database. The texture techniques explored here are Grey level co-occurrence matrix (GLCM), Discrete wavelet transform (DWT), Gabor transform, Curvelet and Local binary pattern (LBP). These are experimented on three touchstone databases which are Wang, Corel-5 K and Corel-10 K. The chief parameters of CBIR systems are evaluated here such as precision, recall and F-measure on all these databases using all the techniques. After detailed investigation it is figured out that LBP, GLCM and DWT provide highlighted and comparable results in all these datasets in terms of average precision. Besides practical implementation, the précised conceptual examination of these three texture techniques is also proposed in this article. So, this analysis is extremely beneficial for selecting the appropriate feature extraction technique by taking into consideration the experimental results along with image conditions such as noise, rotation etc.

     

Statistical framework for image retrieval based on multiresolution features and similarity method

The advent of large scale digital image database leads to great challenges in content-based image retrieval (CBIR) method. The CBIR is considered an active area of research; however, it comprises a strong backdrop for new methodologies and system implementations. Hence, many research contributions focus on these techniques to enable higher image retrieval accuracy while preserving the low level computational complexity. This paper proposes a CBIR method, which is based on an efficient combination of multiresolution based color and texture features. This paper considers color autocorrelogram of the hue(H) and saturation(s) components of HSV color space for color features, and value(V) component of HSV color space for texture features. These two image features are extracted by computing co-occurrence matrix at optimum level image, which is the basis for the formation of feature vector. Though the optimum level is constructed based on wavelet transform, which contains a few dominant wavelet coefficients. The efficiency of the proposed system is tested with standard image databases, and the experimental results show that the proposed method achieves better retrieval accuracy at optimum level; moreover, the proposed method is very fast with low computational load. The obtained results are compared with existing techniques such as orthogonal polynomial model, multiresolution with BDIP-BVLC method and GLCM based system, and results reveal that the proposed method outperforms the existing methods.