Theses and Dissertations
Permanent URI for this collectionhttp://ir.daiict.ac.in/handle/123456789/1
Browse
2 results
Search Results
Item Open Access Image ranking based on clustering(Dhirubhai Ambani Institute of Information and Communication Technology, 2011) Sharma, Monika; Mitra, Suman K.In a typical content-based image retrieval (CBIR) system, query results are a set of images sorted by feature similarities with respect to the query. However, images with high feature similarities to the query may be very different from the query. We introduced a novel scheme to rank images, cluster based image ranking, which tackle this difference in query image and retrieved images based on hypothesis: semantically similar images tends to clustered in same cluster. Clustering approach attempts to capture the difference in query and retrieved images by learning the way that similar images belongs to same cluster. For clustering color moments based clustering approach is used. The moment is the weighted average intensity of pixels. The proposed method is to compute color Moments of separated R,G,B components of images as a feature to get information of the image. This information can be used further in its detail analysis or decision making systems by classification techniques. The moments define a relationship of that pixel with its neighbors. The set of moments computed will be feature vector of that image. After obtaining the feature vector of images, k-means classification technique is used to classify these vectors in k number of classes. Initial assignment of data to the cluster is not random, it is based on maximum connected components of images. The two types of features are used to cluster the images namely: block median based clustering and color moment based clustering. Experiments are performed using these features to analyze their effect on results. To demonstrate the effectiveness of the proposed method, a test database from retrieval result of LIRE search engine is used and result of Lire is used as base line. The results conclude that the proposed methods probably give better result than Lire result. All the experiments have been performed on in MATLAB(R). Wang database of 10000 images is used for retrieval. It can be downloaded from http://wang.ist.psu.edu/iwang/test1.tarItem Open Access Content-based image retrieval system for multi-object images using a combination of features(Dhirubhai Ambani Institute of Information and Communication Technology, 2006) Katare, Aradhana; Mitra, Suman K.; Banerjee, AsimContent-based image retrieval (CBIR) is a research area dedicated to address the retrieval of images based on automatically derived features from the content of the images in database. Traditional CBIR systems generally compute global features of the image for example, based on color histograms. When a query images is fired, it returns all those images whose features match closely with the query image. The major disadvantage of such systems based on global features is that they return the images that match globally but cannot possibly return images corresponding to some particular objects in the query image. The thesis addresses this problem and proposes a CBIR system for multi object image database with 3D objects using the properties of the object in the images for retrieval. Object segmentation has been achieved using GVF Active Contour. An inherent problem with active contours is initialization of contour points. The thesis proposes an approach for automatic initialization of contour points. Experimental results show that the proposed approach works efficiently for contour initialization. In the thesis in addition to shape feature using modified chain code other features for object retrieval using colour with the aid of colour moments and texture using Gabor Wavelets have also been used. A comparative study has been made as to which combination of features performs better. Experimental results indicate that the combination of shape and color feature is a strong feature for image retrieval.