Human perception can recognise objects through image features, such as shapes and curves. For example, we can identify faces, animals, cars, and other daily objects in simple sketch images. For computers, however, recognising objects or image features are challenging tasks.

Accurate modelling of image features is very important in a wide range of computer vision applications, for example: image registration, 3D reconstruction, and object detection. In future technologies such as Google Car, virtual reality, or AI brain, image features will remain fundamental components. In spite of the fact that hundreds of solutions for the detection of image features already exist, up until now there had been a solid concept missing.

In his doctoral dissertation at the Department of Applied Physics and Electronics, Bo Li has developed a breakthrough concept in computer vision: interest curves.

“With this method, the computer can redraw an image using curve strokes and recognise objects through these curves,” says Bo Li.

Interest curves perceived by a computer.

The concept brings about brand new dimensions of understanding image features including points, regions, lines, and curves. It also enables these features to be represented within the same theoretical framework. It advances the standard for future research regarding image features, at the same time as it provides practical guidance to the field.

According to Bo Li, the most important element in feature extraction is the robustness. His results show that his method enables curves and lines to be detected robustly under various image transformations and disturbances.

In the past, curves and lines have not been as popular as points and regions in the field of computer vision because they lack enough robustness and Li’s new theory and algorithms will change this.

“Curves and lines are naturally more useful than points, because humans use these shapes to describe the world,” explains Bo Li.

His doctorate work shows many advantages of using curve features in computer vision applications.

The dissertation has been published digitally

For more information, please contact:

Bo Li, Department of Applied Physics and ElectronicsPhone: +46 76-025 82 01, +46 90-786 68 24

Email: bo.li@umu.se

Press photo for download. Photo: Bo Li

About the author:

Bo Li comes from China. He received a B.E. degree in automation from Tianjin University, China, in 2006, an M.S. Degree in intelligent system and robotics from University of Essex, United Kingdom, in 2009.

He is undertaking his PhD studies in signal processing at Umeå University, from 2010 to 2015. His research interests include image processing, pattern recognition and robotics.

About the dissertation defence:

On Friday 27 November, Bo Li, Department of Applied Physics and Electronics at Umeå University defends his dissertation entitled “Interest curves: concept, evaluation, implementation and applications”.

Opponent is Professor Emeritus Björn Kruse, Department of Science and Technology, Linköping University, Sweden.

Supervisor is Ulrik Söderström at the Department of Applied Physics and Electronics, Umeå University, and Haibo Li at the School of Computer Science and Communication, KTH Royal Institute of Technology, Stockholm.

The public defence of the dissertation will take place at 13:00 in the MIT building, room MA121.

Editor: Anna Lawrence