Lin Bai

Robust and efficient visual tracking under illumination changes based on maximum color difference histogram and min-max-ratio metric

Abstract. Visual tracking under illumination changes is a challenging task for numerous computer vision applications. We propose a robust and efficient tracking algorithm based on maximum color difference histogram (MCDH) and a well-designed min-max-ratio (MMR) similarity metric. Appearance model is essential to the tracker’s robustness under illumination changes. We propose a new feature descriptor MCDH, calculated by exploiting the maximum color difference information within the eight-neighborhood of each pixel in the object region, to build the object appearance model. Unlike the traditional histogram-based algorithms, the MCDH is efficiently extracted by employing the local integral histogram which is propagated in a specially designed local image region. The similarity metric plays an important role on accurately locating the target. However, the existing metrics are not suitable for comparisons of MCDHs due to many zero-valued bins in MCDH. Therefore, we propose a new MMR metric, defined as the average ratio between the minimum and maximum of a MCDH bin pair. The combination of proposed components enables the tracker to be robust to illumination changes with high computational efficiency. Experiments demonstrate superior performance of the proposed tracking algorithm compared with 10 state-of-art tracking methods when illumination varies.

Demonstration of BGP Interworking in Hybrid SPTN/IP Networks

This paper proposes BGP interworking and inter-communication architecture and mechanisms for hybrid SPTN/IP, and the extended Ryu based controllers realize BGP information sharing between SPTN network islands and IP networks in a multi-domain testbed.

Fragmentation-based Dynamic Multicast Routing and Spectrum Assignment Algorithm in Spectrum-sliced Elastic Optical Path Networks

We define the fragmentation based on the blocking probability and propose a fragmentation-based dynamic multicast routing and spectrum assignment (FBDM-RSA) algorithm in spectrum-sliced elastic optical path (SLICE) networks.