A Modified Distortion Measurement Algorithm for Shape Coding

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 distortion measure, called a modified distortion measure for shape coding (DMSC) which incorporates an actual perceptual distance. The performance of the Operational Rate Distortion optimal algorithm [1] incorporating DMSC has been empirically evaluated upon a number of different natural and synthetic arbitrary shapes. Both qualitative and quantitative results confirm the superior results in comparison with the ORD lgorithm for all test shapes, without any increase in computational complexity

Bezier Curve-Based Character Descriptor Considering Shape Information

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 of the algorithm have been rigorously analysed upon both English and Bangla alphabetic characters, with the results confirming that the new BCDSI algorithm exhibits superior performance over other currently available shape descriptor algorithms employing the BC

Video Coding for Mobile Communications

About the book: Mobile Multimedia Communications: Concepts, Applications and Challenges captures defining research on all aspects and implications of the accelerated progress of mobile multimedia technologies. Covered topics include fundamental network infrastructures, modern communication features such as wireless and mobile multimedia protocols, personal communication systems, mobility and resource management, and security and privacy issues. A complete reference to topics driving current and potential future development of mobile technologies, this essential addition to library collections will meet the needs of researchers in a variety of related fields

Mini-Max Bound of the Width of Admissible Control Point Band for Vertex-Based ORD Optimal Shape Coding Algorithms

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