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94 results on '"Xie, Shoulie"'

3. Robust Alignment of Multi-Exposed Images with Saturated Regions

Author

Jiang, Jun, Li, Zhengguo, Xie, Shoulie, Wu, Shiqian, and Zeng, Liangcai

Subjects
Electrical Engineering and Systems Science - Image and Video Processing, CS
Abstract

It is challenging to align multi-exposed images due to large illumination variations, especially in presence of saturated regions. In this paper, a novel image alignment algorithm is proposed to cope with the multi-exposed images with saturated regions. Specifically, the multi-exposed images are first normalized by using intensity mapping functions (IMFs) in consideration of saturated pixels. Then, the normalized images are coded by using the local binary pattern (LBP). Finally, the coded images are aligned by formulating an optimization problem by using a differentiable Hamming distance. Experimental results show that the proposed algorithm outperforms state-of-the-art alignment methods for multi-exposed images in terms of alignment accuracy and robustness to exposure values.

Published
2020

5. Illumination Normalization via Merging Locally Enhanced Textures for Robust Face Recognition

Author

Zheng, Chaobing, Wu, Shiqian, Xu, Wangming, and Xie, Shoulie

Subjects
Computer Science - Computer Vision and Pattern Recognition
Abstract

In order to improve the accuracy of face recognition under varying illumination conditions, a local texture enhanced illumination normalization method based on fusion of differential filtering images (FDFI-LTEIN) is proposed to weaken the influence caused by illumination changes. Firstly, the dynamic range of the face image in dark or shadowed regions is expanded by logarithmic transformation. Then, the global contrast enhanced face image is convolved with difference of Gaussian filters and difference of bilateral filters, and the filtered images are weighted and merged using a coefficient selection rule based on the standard deviation (SD) of image, which can enhance image texture information while filtering out most noise. Finally, the local contrast equalization (LCE) is performed on the fused face image to reduce the influence caused by over or under saturated pixel values in highlight or dark regions. Experimental results on the Extended Yale B face database and CMU PIE face database demonstrate that the proposed method is more robust to illumination changes and achieve higher recognition accuracy when compared with other illumination normalization methods and a deep CNNs based illumination invariant face recognition method, Comment: 10 pages

Published
2019

6. Fast Noise Level Estimation via the Similarity within and between Patches.

Author

Wu, Jiaxin, Jia, Meng, Wu, Shiqian, and Xie, Shoulie

Subjects
PIXELS, NOISE, STANDARD deviations, IMAGE denoising, PROBLEM solving
Abstract

Patch level-based noise level estimation (NLE) is often inaccurate and inefficient because of the harsh criteria required to select a small number of homogeneous patches. In this paper, a fast image NLE method based on a global search for similar pixels is proposed to solve the above problem. Specifically, the mean square distance (MSD) is first expressed in the form of the standard deviation (std) and mean value of image patches. Afterward, the two values, std and mean, are calculated and stored in advance. Then, a 2D statistical histogram and summed area table are adopted to speed up the search for similar patches. Further, the most similar pixels are selected from similar patches to obtain an initial estimation. Finally, we correct the deviation of the initial estimation by re-injecting noise for secondary estimation. Experimental results show that the proposed method outperforms the state-of-the-art techniques in fast NLE and guided denoising. [ABSTRACT FROM AUTHOR]

Published
2024
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16. Performance of DS-CDMA downlink systems with orthogonal UCHT complex sequences

Author

Xie, Shoulie, Rahardja, Susanto, and Gu, Zhenghui

Subjects
Code Division Multiple Access technology, CDMA technology -- Research, Walsh functions -- Research
Abstract

This letter investigates a transmitted signaling technique using orthogonal unified complex Hadamard transform (UCHT) spreading sequences and the coherent RAKE receiver in direct-sequence code-division multiple-access (DS-CDMA) downlinks to maintain the orthogonality between users and reduce the effect of multipath fading and interference from other users. A general multipath-fading channel model is assumed. System performance is evaluated by means of signal-to-interference-pins-noise ratio (SINR) at the RAKE receiver. It is shown that the SINR of the system employing UCHT complex sequences is independent of the phase offsets between different paths, while the SINR of the system using Walsh-Hadamard (WH) sequences is related to the squared cosine of path phase offsets. As a result, the bit-error ratio performance of the DS-CDMA downlink system employing UCHT complex sequences is better than that of the system with WH sequences at high SINRs. Index Terms--Direct-sequence code-division multiple access (DS-CDMA), frequency-selective fading, signal-to-interference-plus-noise ratio (SINR), unified complex Hadamard transform (UCHT) complex sequences, Walsh-Hadamard (WH) sequences.

Published
2007

26. Decentralized Stabilization of a Class of Interconnected Stochastic Nonlinear Systems

Author

Xie, Shoulie and Xie, Lihua

Subjects
Stochastic systems -- Evaluation, Electric controllers -- Analysis, Interconnection (Telecommunications) -- Analysis
Abstract

This paper focuses on a class of large-scale interconnected stochastic nonlinear systems. The interconnections are bounded by strong nonlinear functions that contain first-order and higher order polynomials as special cases. The problem we address is to design a decentralized controller such that the closed-loop, large-scale, interconnected stochastic nonlinear system is globally asymptotically stable in probability for all admissible interconnections. It is shown that the decentralized global stabilization via both state feedback and output feedback can be solved by a Lyapunov-based recursive design method. Index Terms--Decentralized control, dynamic output feedback, interconnected systems, nonlinear stochastic systems, state feedback.

Published
2000

31. Robust and nonlinear control of interconnected systems

Author

Xie, Shoulie., Xie, Lihua, and School of Electrical and Electronic Engineering

Subjects
Engineering::Electrical and electronic engineering::Control and instrumentation::Control engineering [DRNTU]
Abstract

This thesis presents the results of research work on robust and nonlinear control of un-certain interconnected systems. The thesis is divided into two parts, one is on control problems of linear interconnected systems; and the other on control of nonlinear inter-connected systems. The systems under consideration include deterministic and stochastic systems. Doctor of Philosophy (EEE)

Published
1999

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