Image processing, machine learning, solar radio astronomy, synthesis aperture imaging, wavelet 

Journal paper：

[1]     Long Xu, Debin Zhao, Xiangyang Ji, Lei Deng, Sam Kwong, Wen Gao. Window level rate control for smooth visual quality and smooth buffer occupancy. IEEE Transactions on Imaging Processing. Vol. 20, no. 3, pp. 723-734, 2011.

[2]  Long Xu, Sam Kwong, Hanli Wang, Debin Zhao, Yun Zhang, Wen Gao. A Universal Rate Control Scheme for Video Transcoding. IEEE Transactions on Circuits Syst. Video Technol. Vol. 22, no. 4, pp. 489-501, April 2012.

[3]  Long Xu, Sam Kwong,Yun Zhang, Debin Zhao. Low complexity encoder framework for window-level rate control optimization. IEEE Transactions on Industry Electronics. Vol. 60, no. 5, pp. 850-858, May 2013.

[4]  Long Xu, Songnan Li, King Ngi Ngan and Lin Ma, Consistent Visual Quality Assessment and Control for real-time video encoding, IEEE Transactions on Circuits Syst. Video Technol. Vol. 23, no. 6, pp. 975-989, June 2013.

[5]  Long Xu, Sam Kwong, HanliWang, Debin Zhao,Wen Gao. Rate Control for Consistent Visual Quality of H.264/AVC Encoding. Elsevier Signal Processing: Image Communications. Vol. 28, no. 1, pp. 20-33, Jan. 2013.

[6]  Long Xu, Jia Li, Weisi Lin, Yongbing Zhang, Lin Ma, Yuming Fang, and Yihua Yan, "Multi-task Rank Learning for Image Quality Assessment", IEEE Transactions on Circuits Syst. Video Technol. 10.1109/TCSVT.2016.2543099, Mar. 16, 2016.

[7]     Long Xu, Weisi Lin, Lin Ma, Yongbing Zhang, Yuming Fang, King Ngi Ngan, Songnan Li, Yihua Yan, Free-Energy Principle Inspired Video Quality Metric and Its Use in Video Coding，IEEE Trans. Multimedia 18(4): 590-602 (2016)         

[8]     Long Xu, Jia Li, Weisi Lin, Yun Zhang, Yongbing Zhang, Yihua Yan, Pairwise comparison and rank learning for image quality assessment. Elsevier Displays 44: 21-26 (2016)

[9]     Lin Ma, Zhuo Chen, Long Xu^*, and Yihua Yan, Multimodal Deep Learning for Solar Radio Burst Classification        Pattern Recognition, vol. 61, pp. 573-582, Jan. 2017.        

[10]  Lin Ma, Long Xu*, Yichi Zhang, Yihua Yan, King Ngi Ngan, No-Reference Retargeted Image Quality Assessment Based on Pairwise Rank Learning，IEEE Trans. Multimedia 18(11):2228-2237 (2016)

[11]  Zhuo Chen, Lin Ma, Long Xu^*, Chengming Tan, Yihua Yan, Imaging and Representation Learning of Solar Radio Spectrums for Classification, Springer：Multimedia tools and applications, 07 Mar 2015.

[12]  Yongbing Zhang, Long Xu, Xiangyang Ji, Qionghai Dai, A Polynomial Approximation Motion Estimation Model for Motion-Compensated Frame Interpolation IEEE Trans. Circuits Syst. Video Techn. 26(8): 1421-1432 (2016)        

[13]  Zhaoqing Pan, Yun Zhang, Jianjun Lei, Long Xu, Xingming Sun         Zhaoqing Pan, Early DIRECT mode decision based on all-zero block and rate distortion cost for multiview video coding，IET Image Processing 10(1): 9-15 (2016)   

[14]  Yun Zhang, Sam Kwong, Long Xu, and Gangyi Jiang. DIRECT mode early decision optimization based on rate distortion cost property and inter-view correlation. IEEE Transactions on Broadcasting (IEEE T-BC), vol. 59, no.2, pp.390-398, Jun. 2013 (SCI IF 2.242)

[15]  Yun Zhang, Sam Kwong, Long Xu, Sudeng Hu, Gangyi Jiang and C.-C. Jay Kuo, Regional bit allocation and rate distortion optimization for multiview depth video coding with view synthesis distortion model, IEEE Transactions on Image Processing (IEEE T-IP), 22(9):3497-512, 2013. (SCI IF 3.042)

[16]  Yun Zhang, Sam Kwong, Xu Wang, Hui Yuan, Zhaoqing Pan, Long Xu: Machine Learning-Based Coding Unit Depth Decisions for Flexible Complexity Allocation in High Efficiency Video Coding. IEEE Transactions on Image Processing 24(7): 2225-2238 (2015)

[17]  Zhaoqing Pan, Sam Kwong, Long Xu, Yun Zhang, and Tiesong Zhao, Predictive and distribution-oriented fast motion estimation for H.264/AVC, Journal of Real-Time Image Processing (JRTIP), vol. 9, no. 4, pp. 597-607, June 2012.

[18]  Miaohui Wang, King Ngi Ngan, Long Xu: Efficient H.264/AVC Video Coding with Adaptive Transforms. IEEE Transactions on Multimedia, vol.  16, no. 4, pp. 933-946, 2014.

[19]  Xu Wang, Sam Kwong, Long Xu, Yun Zhang: Generalized Nash Bargaining Solution to Rate Control Optimization for Spatial Scalable Video Coding. IEEE Transactions on Image Processing 23(9): 4010-4021 (2014).

[1]           METHOD FOR CODING A SUBSEQUENT SEQUENCE OF PICTURES BY HELP OF A PRECEDING SEQUENCE OF PICTURES

Inventor(s): LI HUA (ERIC) ZHU, LONG XU, LIBO YANG

Publication info: WO2009056453 (A1) - 2009-05-07

Also published as: EP2059050 (A1) - 2009-05-13

[2]           METHOD AND APPARATUS FOR TWO-PASS VIDEO SIGNAL ENCODING USING A SLIDING WINDOW OF PICTURES

Inventor(s): LONG XU, JUN LI, NING LIAO

Publication info: EP2200320 (A1) - 2010-06-23

[3]           METHOD AND APPARATUS FOR BIT RATE CONTROL IN SCALABLE VIDEO SIGNAL ENCODING USING A RATE-DISTORTION OPTIMIZATION

Inventor: ZHU LI HUA [CN] ; XU LONG [CN] (+1)

Publication info: WO2007101791 (A1)- 2007-09-13

Also published as: EP1992169 (A1) - 2008-11-19 EP1833257 (A1) - 2007-09-12

[4]           RHO DOMAIN RATE CONTROL AND CODING MODE SELECTION FOR H.264

Inventor: ZHU LI HUA [CN]; XU LONG [CN] (+1)

Publication info: WO2007107437 (A1) - 2007-09-27

Also published as: EP1835750 (A1) - 2007-09-19

[5]            RATE CONTROL FOR CONTENT TRANSCODING

 Inventors: LONG XU, SAM KWONG;

Applicant for patent: City University of Hong Kong

Publication info: US20130272383 A1

image processing, machine learning, synthesis aperture imaging, wavelet, solar radio astronomy

Group member:

Jun Cheng,     engineer;

Dong Zhao,     PhD student;

Xuexin Yu,       PhD student;

Xianyou Zeng, PhD student;

Sisi Chen,        Master student;

Wenqin Sun,    Master student;

Sixuan Liu,      Master student;

Xinze Zhang,   Master student;