Ee Ping Ong

Agency for Science, Technology and Research

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Weisi Lin

Nanyang Technological University

Zhongkang Lu

Institute for Infocomm Research

Susu Yao

Institute for Infocomm Research

Xiaokang Yang

Shanghai Jiao Tong University

Susanto Rahardja

Northwestern Polytechnical University

S. Yao

Institute for Infocomm Research

Damon Wing Kee Wong

Singapore National Eye Center

Shiqian Wu

Wuhan University of Science and Technology

Jun Cheng

Institute for Infocomm Research

Guozhen Xu

Nanjing University of Science and Technology

Cooperative Institutions

Agency for Science, Technology and Research

Institute for Infocomm Research

Nanyang Technological University

National University of Singapore

Chinese Academy of Sciences

Institute of Microelectronics

China Southern Power Grid (China)

Tan Tock Seng Hospital

Shanghai Jiao Tong University

NTT (Japan)

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Just noticeable distortion model and its applications in video coding

Signal Processing Image Communication (2005)

Xiao Yang Weisi Lin Zhongkang Lu Ee Ping Ong S. Yao

Rate–distortion optimization

10.1016/j.image.2005.04.001

Cite

Citations (319)

Modelling visual attention and motion effect for visual quality evaluation

Zhongkang Lu Weisi Lin Xiaokang Yang Ee Ping Ong Susu Yao

The perceptual visual quality evaluation of human visual system (HVS) is very complex. It concerns almost all aspects of visual processing in the vision path, from low-level neuron activities to high-level visual perception. Existing perceptual visual quality metrics (VQMs) only considered several of the mechanisms of HVS, and many others are ignored. In this paper, two global modulatory factors, visual attention and motion suppression, are modelled and combined to form a mathematic expression - perceptual quality significant level (PQSL). To a certain extent, it is believed that PQSL values reflect the processing ability of the human brain on local visual content. To evaluate their effects on visual quality evaluation, two VQMs are proposed. One is a MSE-like VQM based in a PQSL-modulated JND profile, which was proposed in (Z. K. Lu et al, Proc. ICASSP'2004, v.3, p.705-708, 2004); the other VQM is based on Wang's visual quality assessment (Sig. Proc.:Image Comm., v.19, n.2, p.121-132, 2004), PQSL values are used to adjust the weights of his structural similarity index. Experimental results show that introduction of the global modulatory factors can improve the performance of current visual quality metrics.

Visual processing

Similarity (geometry)

10.1109/isimp.2004.1434116

Cite

Citations (1)

Fast Automatic Video Object Segmentation for Content-Based Applications

IGI Global eBooks (2006)

Ee Ping Ong Weisi Lin B.J. Tye Minoru Etoh

An algorithm has been devised for fast, fully automatic and reliable object segmentation from live video for scenarios with static camera. The contributions in this chapter include methods for: (a) adaptive determination of the threshold for change detection; (b) robust stationary background reference frame generation, which when used in change detection can reduce segmentation fault rate and solve the problems of dis-occluded objects appearing as part of segmented moving objects; (c) adaptive reference frame selection to improve segmentation results; and (d) spatial refinement of modified change detection mask by incorporating information from edges, gradients and motion to improve accuracy of segmentation contours. The algorithm is capable of segmenting multiple objects at a speed of 12 QCIF frames per second with a Pentium-4 2.8GHz personal computer in C coding without resorting to any code optimization. The result shows advantages over related work in terms of both fault rate and processing speed.

Pentium

Frame rate

10.4018/978-1-59140-753-9.ch007

Cite

Citations (4)

Source localization on solids using Kullback-Leibler discrimination information

K. Arun Ee Ping Ong Andy W. H. Khong

We propose a new source localization algorithm for the development of a touch interface using surface-mounted sensors. This algorithm allows one to convert a hard surface into a touch pad. The proposed algorithm is based on triangulation using phase transit time-differences-of-arrival (TDOA) between the received signals from the sensors. In this inter-disciplinary research, we analyze the wave propagation of flexural vibration due to an impact on a surface which in turn allows one to gain insights to the frequency spectrum diversity of vibration signals and background noise. We then show how the Kullback-Leibler discrimination information can be used to determine the phase transit time of the vibration signal. The performance of the proposed algorithm is compared with existing TDOA approaches on real surfaces.

SIGNAL (programming language)

Aperture (computer memory)

10.1109/icics.2011.6174299

Cite

Citations (9)

Video coding based on true motion estimation

2003 IEEE International Conference on Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03). (2003)

Ee Ping Ong Hua Wang Ping Xue

A new approach for MC-DCT (motion compensated-discrete cosine transform) hybrid video coding based on true motion estimation is proposed. The true motion estimation technique employs the least-median-squares (LMedS) matching criterion in block matching process for motion estimation. The rationale for using such true motion estimator is that at low bit-rates, very few bits are available for coding the motion-compensated DCT errors, and thus the detection of the true underlying motion of the picture block becomes much more important than just trying to find a block-match that satisfies the traditional least-mean-squares (LMS) matching criterion. Without detecting the true motion of the picture block, the errors due to insufficient bits for coding the motion-compensated DCT errors will be propagated to succeeding inter-frames, resulting in a progressive degeneration on perceptual quality of the pictures. An important advantage of using true motion estimation is that it results in better perceptual video quality compared to the conventional block-matching algorithm that utilizes least-mean-squares matching criterion. Experimental results obtained had supported our proposition on using the LMedS-based matching criterion in block-matching motion estimation for low bit rate video coding.

Quarter-pixel motion

10.1109/icassp.2003.1199498

Cite

Citations (2)

Perceptually-adaptive pre-processing for motion-compensated residue in video coding

Xiaokang Yang Weisi Lin Zhongkang Lu Ee Ping Ong S. Yao

We present a perceptually-adaptive pre-processing scheme for motion-compensated residue, based on just-noticeable-distortion (JND) profile. Human eyes cannot sense any changes below the JND threshold around a pixel due to their underlying spatial/temporal masking properties. From the viewpoint of signal compression, a smaller variance of signal results in less objective distortion of the reconstructed signal for a given bit-rate. In this paper, the JND profile is incorporated into a motion-compensated residue signal preprocessor for variance reduction, aimed at coding quality enhancement. A solution of adaptively determining the parameter for the residue pre-processor is also proposed. Experimental results show that both perceptual quality and objective quality are enhanced in coded video at a given bitrate.

Auditory masking

10.1109/icip.2004.1418797

Cite

Citations (1)

IR face synthesis using motion vector field

Li Jun Jiang Shiqian Wu Dajun Wu Feng Pan Ee Ping Ong

Infrared (IR) imaging device provides natural motivation for illumination-free face recognition. In this study, a method that can create a new IR face view between two given IR face images taken at different view points is presented, using motion vectors. Unlike existing prior arts which utilize optical flow, the proposed method utilizes the block based matching method to obtain correspondence between the two given IR face images. In addition, interpolation algorithm is employed to make the sparse motion vector "dense". An iterative error correction method is developed to reduce the errors of motion vectors. There is no facial features detection involved in our system so that it is suitable for IR images in which facial features like eyes, nose are blurred. The proposed method can be used for IR face recognition, animation, etc.

Optical Flow

Interpolation

Motion field

Motion vector

10.1109/isspa.2003.1224736

Cite

Citations (1)

Measuring the negative impact of frame dropping on perceptual visual quality

Proceedings of SPIE - The International Society for Optical Engineering (2005)

Zhongkang Lu Weis Lin Susu Yao Ee Ping Ong Xilin Yang

Source

Cite

Citations (0)

Choroid Segmentation in Optical Coherence Tomography Images Using Deep Learning

IFMBE proceedings (2021)

Ruchir Srivastava Ee Ping Ong Beng-Hai Lee

Choroid

10.1007/978-3-030-62045-5_4

Cite

Citations (0)

Quantitative Comparison of Color Asymmetry Features for Automatic Melanoma Detection

2021 43rd Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC) (2021)

Ruchir Srivastava Ee Ping Ong Beng-Hai Lee Lucinda Siyun Tan Hong Liang Tey

Asymmetry assessment is an important step towards melanoma detection. This paper compares some of the color asymmetry features proposed in the literature which have been used to automatically detect melanoma from color images. A total of nine features were evaluated based on their accuracy in predicting lesion asymmetry on a dataset of 277 images. In addition, the accuracies of these features in differentiating melanoma from benign lesions were compared. Results show that simple features based on the brightness difference between the two halves of the lesion performed the best in predicting asymmetry and subsequently melanoma.Clinical relevance- The proposed work will assist researchers in choosing better performing color asymmetry features thereby improving the accuracy of automatic melanoma detection. The resulting system will reduce the workload of clinicians by screening out obviously benign cases and referring only the suspicious cases to them.

Melanoma diagnosis

10.1109/embc46164.2021.9631103

Cite

Citations (2)