Abstract–This paper addresses a fundamental limitation of the existing distortion measures embedded in vertexbased operational-rate-distortion shape coding techniques by introducing a new accurate distortion measurement algorithm based... more
Abstract–This paper addresses a fundamental limitation of the existing distortion measures embedded in vertexbased operational-rate-distortion shape coding techniques by introducing a new accurate distortion measurement algorithm based upon the actual distance, rather than either the shortest absolute distance or a distortion band. Keywords–Generic shape coding, shortest absolute distance, distortion band, actual distance, rate-distortion.
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This paper presents the mini-max bound on the width of the admissible control point band of the shape coding algorithms. It also proposes to use an accurate distortion measure instead of the tolerance band.
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Efficient encoding of object boundaries has become increasingly prominent in areas such as content-based storage and retrieval, studio and television post-production facilities, mobile communications and other real-time multimedia... more
Efficient encoding of object boundaries has become increasingly prominent in areas such as content-based storage and retrieval, studio and television post-production facilities, mobile communications and other real-time multimedia applications. The way distortion between the actual and approximated shapes is measured however, has a major impact upon the quality of the shape coding algorithms. In existing shape coding methods, the distortion measure do not generate an actual distortion value, so this paper proposes a new ...
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This paper addresses a fundamental limitation of the existing distortion measures embedded in vertex- based operational-rate-distortion shape coding techniques by introducing a new accurate distortion measurement algorithm based upon the... more
This paper addresses a fundamental limitation of the existing distortion measures embedded in vertex- based operational-rate-distortion shape coding techniques by introducing a new accurate distortion measurement algorithm based upon the actual distance, rather than either the shortest absolute distance or a distortion band.
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Abstract—Bezier curves are fundamental to a wide array of applications like computer aided design, object shape description, calligraphic character description and surface mapping. However, as Bezier curves consider only the global... more
Abstract—Bezier curves are fundamental to a wide array of applications like computer aided design, object shape description, calligraphic character description and surface mapping. However, as Bezier curves consider only the global information of its control points, it leads to erroneous representations in these applications. This error can be minimized if the local information of the Bezier control points is incorporated with the global information. This paper presents one such technique namely a novel half-way shifting Bezier curve (HSBC) ...
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This paper presents the mini-max bound on the width of the admissible control point band of the shape coding algorithms. It also proposes to use an accurate distortion measure instead of the tolerance band. Keywords:... more
This paper presents the mini-max bound on the width of the admissible control point band of the shape coding algorithms. It also proposes to use an accurate distortion measure instead of the tolerance band. Keywords: operational-rate-distortion, vertex-based shape coding.
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The video coding standard MPEG-4 is enabling content-based functionalities of a prior decomposition of sequences into video object planes (VOP) so that each VOP represents a semantic object. Therefore extraction of semantic objects is an... more
The video coding standard MPEG-4 is enabling content-based functionalities of a prior decomposition of sequences into video object planes (VOP) so that each VOP represents a semantic object. Therefore extraction of semantic objects is an important part. There are various coding tools: shape coding, motion estimation and compensation, texture coding, multifunctional coding, error resilience, sprite coding and scalability. These are performed by using diverse techniques, like: pixel based segmentation, region based ...
The Bezier curve is fundamental to many challenging and practical applications, ranging from computer aided geometric design and postscript font representations through to generic object shape descriptors and surface representation. A... more
The Bezier curve is fundamental to many challenging and practical applications, ranging from computer aided geometric design and postscript font representations through to generic object shape descriptors and surface representation. A drawback of the Bezier curve however, is that it only considers global information about the control points, so there is often a large gap between the curve and its control polygon, leading to considerable error in curve representations. To address this issue, this paper presents enhanced Bezier ...
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Vertex-based operational-rate-distortion (ORD) shape coding algorithms often employ a sliding window (SW) to both avoid trivial solutions and improve computational efficiency. The SW-width is a design parameter that enables an encoder to... more
Vertex-based operational-rate-distortion (ORD) shape coding algorithms often employ a sliding window (SW) to both avoid trivial solutions and improve computational efficiency. The SW-width is a design parameter that enables an encoder to exchange bit-rate for computational overhead. This paper presents a series of novel approaches for determining the SW-width that adapt with the rate-distortion constraints. From a constrained bit-rate perspective, this is achieved by estimating the maximum number of significant ...
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Research Interests: Computer Vision, Augmented Reality, Object Recognition (Computer Vision), HCI, Edge Detection, and 10 moreLaser Scanning, Point Cloud, Principal component analysis (PCA), Normal Vector Estimation, Least Square Fitting (LSF), Gradient Method, Range Image Segmentation, Terrestrial Laser Scanning (TLS), Airborne Laser Scanning (ALS), and Ubiquitous Virtual Reality
Abstract While a Bezier curve (BC)-based character descriptor calculates the control points (CPs), it does not consider the shape characteristics for a prescribed distortion. This paper presents a novel Bezier Curve-based character... more
Abstract While a Bezier curve (BC)-based character descriptor calculates the control points (CPs), it does not consider the shape characteristics for a prescribed distortion. This paper presents a novel Bezier Curve-based character descriptor considering shape information (BCDSI) which automatically divides a shape into segments based on the curvature and cornerity properties. Each segment is then defined by either a BC or straight line, depending on the distortion criteria in terms of a set of CPs. Quantitative and qualitative performances ...
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ABSTRACT This paper presents an audio visual (AV) person identification system using Linear Regression-based Classifier (LRC) for person identification. Class specific models are created by stacking q-dimensional speech and image vectors... more
ABSTRACT This paper presents an audio visual (AV) person identification system using Linear Regression-based Classifier (LRC) for person identification. Class specific models are created by stacking q-dimensional speech and image vectors from the training data. The person identification task is considered a linear regression problem, i.e., a test (speech or image) feature vector is expressed as a linear combination of the (speech or image) model of the class it belongs to. The Euclidean distance between a test feature vector and the estimated response vectors for all the class specific models are used as matching scores. These matching scores from both modalities are normalized using the min-max score normalization technique and then combined using the the sum rule of fusion. The system was tested on 88 subjects from the AusTalk AV database. Experimental results show that the identification accuracy after AV fusion is higher compared to the identification accuracy of an individual modality.
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Efficient encoding of object boundaries has become increasingly prominent in areas such as content-based storage and retrieval, studio and television post-production facilities, mobile communications and other real-time multimedia... more
Efficient encoding of object boundaries has become increasingly prominent in areas such as content-based storage and retrieval, studio and television post-production facilities, mobile communications and other real-time multimedia applications. The way distortion between the actual and approximated shapes is measured however, has a major impact upon the quality of the shape coding algorithms. In existing shape coding methods, the distortion