A GEOMETRIC METHOD TO COMPUTE DIRECTIONALITY FEATURES FOR TEXTURE IMAGES (2009)
Md Monirul Islam, Dengsheng Zhang, Guojun Lu
In content based image analysis and retrieval, texture feature is an essential component due to its strong discriminative power. Directionality is one of the most significant texture features which...
GENERAL IMAGE RETRIEVAL USING SHAPE AND COMBINED FEATURES (2009)
Content-based image retrieval (CBIR) is an important multimedia application. In recently emerged MPEG-7 standard, image content is described by perceptual features such as color, texture and shape....
Integrating Semantic Templates with Decision Tree for Image Semantic Learning (2009)
Ying Liu, Dengsheng Zhang, Guojun Lu, Ah-hwee Tan
Abstract. Decision tree (DT) has great potential in image semantic learning due to its simplicity in implementation and its robustness to incomplete and noisy data. Decision tree learning naturally...
2008 Congress on Image and Signal Processing Corners-Based Composite Descriptor for Shapes (2009)
Atul Sajjanhar, Guojun Lu, Dengsheng Zhang, Wanlei Zhou
In this paper, a composite descriptor for shape retrieval is proposed. The composite descriptor is obtained based upon corner-points and shape region. In an earlier paper, we proposed a composite...
Automatic Categorization of Image Regions using Dominant Color based Vector Quantization (2009)
Md Monirul Islam, Dengsheng Zhang, Guojun Lu
Abstract—This paper proposes a dominant color based vector quantization algorithm that automatically categorizes image regions. In contrast to the conventional vector quantization algorithm, the...
Image Retrieval Based On Semantics of Intra-Region Color Properties (2009)
Atul Sajjanhar, Guojun Lu, Dengsheng Zhang, Wanlei Zhou
Traditional image retrieval systems are content based image retrieval systems which rely on low-level features for indexing and retrieval of images. CBIR systems fail to meet user expectations...
Content Based Image Retrieval Using Curvelet Transform (2009)
Ishrat Jahan Sumana, Md. Monirul Islam, Dengsheng Zhang, Guojun Lu
Abstract—Feature extraction is a key issue in contentbased image retrieval (CBIR). In the past, a number of texture features have been proposed in literature, including statistic methods and...
Abstract. Shape is an important image feature – it is one of the primary low level image features exploited in content-based image retrieval (CBIR). There are generally two types of shape...
Deriving High-Level Concepts Using Fuzzy-ID3 Decision Tree for Image Retrieval (2008)
Ying Liu, Dengsheng Zhang, Guojun Lu, Wei-ying Ma
To improve the retrieval accuracy of content-based image retrieval, an important task is to reduce the ‘semantic gap’ between low-level image features and the richness of human semantics. In this...
Prof Dr, Paul Müller, Michael Schneider, Guojun Lu, Borko Furht, Milan Milenkovic, ...
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Global Geometric Distortion Correction in Images (2008)
Mohammad Awrangjeb, Manzur Murshed, Guojun Lu
Abstract—The performance of existing copyright protection schemes is questionable due to their vulnerability to geometric transformations. Though a few of them can resist global geometric...
Coherence Based Histograms for Shape Retrieval (2008)
Atul Sajjanhar, Guojun Lu, Dengsheng Zhang
Histograms have been used for Shape Representation and Retrieval. The drawback of the histograms method is that histograms can be same for dissimilar shapes, which renders the method less effective...
features in Content Based Image Retrieval (CBIR). (2008)
Abstract: Shape is one of the most important
SIEVE—Search Images Effectively through Visual Elimination (2008)
Ying Liu, Dengsheng Zhang, Guojun Lu
Abstract. Existing Web image search engines index images by textual descriptions including filename, image caption, surrounding text, etc. However, the textual description available on the Web could...
Comparison of Retrieval Effectiveness of Different Region Based Image Representations (2008)
Md Monirul Islam, Dengsheng Zhang, Guojun Lu
Abstract—The choice for low level representation of images makes a significant difference in image retrieval performance regardless whether the retrieval engine works on low level or high level...
Multiresolution Analysis of Connectivity (2008)
Atul Sajjanhar, Guojun Lu, Dengsheng Zhang, Tian Qi
Abstract. Multiresolution histograms have been used for indexing and retrieval of images. Multiresolution histograms used traditionally are 2d-histograms which encode pixel intensities. Earlier we...
Dengsheng Zhang (contact, Guojun Lu
Contour shape descriptors are among the important shape description methods. Fourier descriptors (FD) and curvature scale space descriptors (CSSD) are widely used as contour shape descriptors for...
A Composite Descriptor for Shape Retrieval (2008)
Atul Sajjanhar, Guojun Lu, Dengsheng Zhang, Wanlei Zhou
In this paper, a composite descriptor for shape retrieval has been proposed. The proposed descriptor is obtained from Generic Fourier Descriptors (GFD) for the shape region and the shape contour. A...
Segmented Results of Our FRIS Algorithm (2008)
Gour Karmakar, Laurence Dooley, M. Manzur Murshed, Dengsheng Zhang, Guojun Lu, Any Segmentation, ...
�The �The process of separating out mutually exclusive homogeneous regions of interest. �There �There is no standard formal definition
Image Retrieval Using Modified Generic Fourier Descriptors (2007)
Atul Sajjanhar, Guojun Lu, Dengsheng Zhang
Abstract: Generic Fourier Descriptors have been used for image retrieval [12]. In this paper, we have proposed a modification to the Generic Fourier Descriptors. We have performed experiments to...
Composite descriptor for shape retrieval (2007)
Sajjanhar, Atul, Lu, Guojun, Zhang, Dengsheng, Zhou, Wanlei
In this paper, a composite descriptor for shape retrieval has been proposed. The proposed descriptor is obtained from Generic Fourier Descriptors (GFD) for the shape region and the shape contour. A...
Composite descriptor for shape retrieval (2007)
Sajjanhar, Atul, Lu, Guojun, Zhang, Dengsheng, Zhou, Wanlei
In this paper, a composite descriptor for shape retrieval has been proposed. The proposed descriptor is obtained from Generic Fourier Descriptors (GFD) for the shape region and the shape contour. A...
A composite descriptor for shape retrieval (2007)
Sajjanhar, Atul, Lu, Guojun, Zhang, Dengsheng, Zhou, Wanlei
In this paper, a composite descriptor for shape retrieval has been proposed. The proposed descriptor is obtained from Generic Fourier Descriptors (GFD) for the shape region and the shape contour. A...
Ying Liu, Dengsheng Zhang, Guojun Lu
image retrieval with high-level semantics using decision tree learning
Multiresolution analysis of connectivity (2005)
Sajjanhar, Atul, Lu, Guojun, Zhang, Dengsheng, Qi, Tian
Multiresolution histograms have been used for indexing and retrieval of images. Multiresolution histograms used traditionally are 2d-histograms which encode pixel intensities. Earlier we proposed a...
Spherical harmonics descriptor for 2D-image retrieval (2005)
Sajjanhar, Atul, Lu, Guojun, Zhang, Dengsheng
In this paper, spherical harmonics are proposed as shape descriptors for 2D images. We introduce the concept of connectivity; 2D images are decomposed using connectivity, which is followed by 3D...
Region-Based Image Retrieval with High-Level Semantic Color Names (2005)
Ying Liu, Dengsheng Zhang, Guojun Lu, Wei-ying Ma
Performance of traditional content-based image retrieval systems is far from user’s expectation due to the ‘semantic gap ’ between low-level visual features and the richness of human semantics....
Multiresolution analysis of connectivity (2005)
Sajjanhar, Atul, Lu, Guojun, Zhang, Dengsheng, Qi, Tian
Multiresolution histograms have been used for indexing and retrieval of images. Multiresolution histograms used traditionally are 2d-histograms which encode pixel intensities. Earlier we proposed a...
Spherical harmonics descriptor for 2D-image retrieval (2005)
Sajjanhar, Atul, Lu, Guojun, Zhang, Dengsheng
In this paper, spherical harmonics are proposed as shape descriptors for 2D images. We introduce the concept of connectivity; 2D images are decomposed using connectivity, which is followed by 3D...
Deriving High-Level Concepts Using Fuzzy-ID3 Decision Tree for Image Retrieval (2005)
Ying Liu, Dengsheng Zhang, Guojun Lu, Wei-ying Ma
To improve the retrieval accuracy of content-based image retrieval, an important task is to reduce the ‘semantic gap’ between low-level image features and the richness of human semantics. In this...
Angular histograms for shape retrieval (2004)
Sajjanhar, Atul, Lu, Guojun, Zhang, Dengsheng
Distance histograms have been used for Shape Representation and Retrieval [1][2]. In this paper, we have proposed the use of angular histograms for shape representation. We have implemented a system...
Coherence based histograms for shape retrieval (2004)
Sajjanhar, Atul, Lu, Guojun, Zhang, Dengsheng
Histograms have been used for Shape Representation and Retrieval. The drawback of the histograms method is that histograms can be same for dissimilar shapes, which renders the method less effective...
Discriminating shape descriptors based on connectivity (2004)
Sajjanhar, Atul, Lu, Guojun, Zhang, Dengsheng
We propose a method for enhancing the accuracy of shape descriptors. The concept of connectivity to obtain discriminating shape descriptors, is introduced. We show how connectivity is applied to two...
Multi-scale analysis of connectivity for image retrieval (2004)
Sajjanhar, Atul, Lu, Guojun, Zhang, Dengsheng
Previously, we proposed the concept of connectivity to obtain discriminating shape descriptors. In this paper, we use connectivity to obtain superior distance histograms for multi-scale images....
Image retrieval using modified generic fourier descriptors (2004)
Sajjanhar, Atul, Lu, Guojun, Zhang, Dengsheng
Generic Fourier Descriptors have been used for image retrieval [12]. In this paper, we have proposed a modification to the Generic Fourier Descriptors. We have performed experiments to compare the...
Effects of different gabor filter parameters on image retrieval by texture (2004)
Lianping Chen, Guojun Lu, Dengsheng Zhang
Gabor filter is widely used to extract texture features from images for image retrieval. A number of parameters (number of scales and orientations and filter mask size) are used in the Gabor Filter....
Region-based Image Retrieval with Perceptual Colors (2004)
Ying Liu, Dengsheng Zhang, Guojun Lu, Wei-ying Ma
Abstract. Due to the ‘semantic gap ’ between low-level visual features and the rich semantics in user’s mind, performance of traditional contentbased image retrieval systems is far from...
Angular Histograms for Shape Retrieval (2004)
Atul Sajjanhar Guojun, Guojun Lu, Dengsheng Zhang
Distance histograms have been used for Shape Representation and Retrieval [1][2]. In this paper, we have proposed the use of angular histograms for shape representation. We have implemented a system...
Coherence based histograms for shape retrieval (2004)
Sajjanhar, Atul, Lu, Guojun, Zhang, Dengsheng
Histograms have been used for Shape Representation and Retrieval. The drawback of the histograms method is that histograms can be same for dissimilar shapes, which renders the method less effective...
Image retrieval using modified generic fourier descriptors (2004)
Sajjanhar, Atul, Lu, Guojun, Zhang, Dengsheng
Generic Fourier Descriptors have been used for image retrieval [12]. In this paper, we have proposed a modification to the Generic Fourier Descriptors. We have performed experiments to compare the...
Angular histograms for shape retrieval (2004)
Sajjanhar, Atul, Lu, Guojun, Zhang, Dengsheng
Distance histograms have been used for Shape Representation and Retrieval [1][2]. In this paper, we have proposed the use of angular histograms for shape representation. We have implemented a system...
Discriminating shape descriptors based on connectivity (2004)
Sajjanhar, Atul, Lu, Guojun, Zhang, Dengsheng
We propose a method for enhancing the accuracy of shape descriptors. The concept of connectivity to obtain discriminating shape descriptors, is introduced. We show how connectivity is applied to two...
Multi-scale analysis of connectivity for image retrieval (2004)
Sajjanhar, Atul, Lu, Guojun, Zhang, Dengsheng
Previously, we proposed the concept of connectivity to obtain discriminating shape descriptors. In this paper, we use connectivity to obtain superior distance histograms for multi-scale images....
Shape Based Image Retrieval Using Generic Fourier Descriptors (2002)
Shape description is one of the key parts of image content description for image retrieval. Most of existing shape descriptors are usually either application dependent or non-robust, making them...
A Comparative Study of Three Region Shape Descriptors (2002)
In Content Based Image Retrieval (CBIR), shape is one of the primary low level image features. Many shape representations have been proposed. However, most of them assume the knowledge of shape...
Enhanced generic Fourier descriptors for object-based image retrieval (2002)
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www.elsevier.com/locate/patcog Review of shape representation anddescription techniques (2002)
More and more images have been generated in digital form around the world. There is a growing interest in nding images in large collections or from remote databases. In order to nd an image, the...
A comparative Study of Fourier Descriptors for Shape Representation and Retrieval (2002)
Shape is one of the primary low level image features in Content Based Image Retrieval (CBIR). Many shape representations and retrieval methods exist. However, most of those methods either do not well...
An Integrated Approach to Shape Based Image Retrieval (2002)
Shape is one of the primary low level image features in the newly emerged Content Based Image Retrieval (CBIR). Many shape representations have been proposed, and they are generally classified into...
Segmentation of moving objects in image sequence: A review (2001)
Segmentation of objects in image sequences is very important in many aspects of multimedia applications. In the second generation image/video coding, images are segmented into objects to achieve...
Shape Retrieval Using Fourier Descriptors (2001)
Shape is one of the primary features in Content Based Image Retrieval (CBIR). Many shape representations and retrieval methods exist. However, most of those methods either do not well capture shape...
Content-based Image Retrieval Using Gabor Texture Features (2000)
Dengsheng Zhang, Aylwin Wong, Maria Indrawan, Guojun Lu
Abstract: Gabor wavelet proves to be very useful texture analysis and is widely adopted in the literature. In this paper we present a image retrieval method based on Gabor filter. Texture features...
An edge and color oriented optical flow estimation using block matching (2000)
Abstract: For most tasks in image sequence analysis, the estimation of optical flow is the primary step towards the final solution. Block matching, which is adopted by many current coding standards,...
A novel image retrieval technique based on vector quantization (1999)
It is advantageous in terms computational efficiency to carry out image indexing and retrieval based on compressed data. We describe an image indexing and retrieval scheme based on vector...
A grid based shape indexing and retrieval method (1997)
ABSTRACT: One of the content based image retrieval techniques is the shape based technique which allows users to ask for objects similar in shape to a query object. We propose a novel method for...
Graphics and video communications over an integrated services network. (1989)
Thesis (Ph. D.)--Loughborough University of Technology, 1989.
Huang, Xuehui, Lu, Guojun, Zhao, Qiang, Liu, Xiaohui, Han, Bin
Insertions and precise eliminations of transposable elements generated numerous transposon insertion polymorphisms (TIPs) in rice (Oryza sativa). We observed that TIPs represent more than 50% of...