tailieunhanh - Summary of PhD thesis Computer science: Improve the efficiency of contentbased image retrieval through weight adjustment technique of the distance function

The thesis proposes a number of image retrieval methods to improve image retrieval accuracy. These methods will address issues of reducing semantic gaps between low-level features and high-level concepts of images. | MINISTRY OF EDUCATION VIETNAM ACADEMY OF SCIENCE AND TRAINING AND TECHNOLOGY GRADUATE UNIVERSITY OF SCIENCE AND TECHNOLOGY . . DAO THI THUY QUYNH IMPROVE THE EFFICIENCY OF CONTENT-BASED IMAGE RETRIEVAL THROUGH WEIGHT ADJUSTMENT TECHNIQUE OF THE DISTANCE FUNCTION Major Computer Science Code 9 48 01 01 SUMMARY OF PHD THESIS Ha Noi 2019 1 The thesis has been completed Graduate University Of Science And Technology - Vietnam Academy Of Science And Technology Supervisor 1. Assoc. Prof. Dr. Ngo Quoc Tao Supervisor 2. Assoc. Prof. Dr. Nguyen Huu Quynh Review 1 Review 2 Review 3 The thesis will be defended at the Board of Examiners of Graduate University Of Science And Technology - Vietnam Academy Of Science And Technology at .on . The thesis can be explored at - Library of Graduate University Of Science And Technology - National Library of Vietnam 2 PREFACE 1. Motivation of the thesis Image database is becoming more and more popular in various application fields such as remote sensing crime prevention medicine education . The evolution of image acquisition transmission and storage techniques has allowed the construction of very large image databases. These factors have prompted the attention of the image retrieval community to propose ways to effectively exploit this image database. Content-based image retrieval techniques are time-consuming costly and depend on the subjective perception of the descriptors. Moreover when changes are needed this system is difficult to implement. To overcome this problem in the early 1990s content-based image retrieval CBIR was launched. The basic idea of this approach is to use automated visual feature extraction techniques to produce content descriptions from images such as color texture and shape characteristics. These content descriptions are used for indexing images. There are many content based image retrieval systems that have been proposed. However many experiments on CBIR systems indicate that low-level content often fails to .