Signal Processing

Download Advanced Video Coding: Principles and Techniques: The by K.N. Ngan, T. Meier, D. Chai PDF

By K.N. Ngan, T. Meier, D. Chai

Lately, the paradigm of video coding has shifted from that of a frame-based method of a content-based process, rather with the finalization of the ISO multimedia coding average, MPEG-4. MPEG-4 is the rising normal for the coding of multimedia content material. It defines a syntax for a suite of content-based functionalities, particularly, content-based interactivity, compression and common entry. even though, it doesn't specify how the video content material is to be generated. To generate the video content material, video should be segmented into video items and tracked as they transverse around the video frames. This publication addresses the tricky challenge of video segmentation, and the extraction and monitoring of video item planes as outlined in MPEG-4. It then specializes in the categorical factor of face segmentation and coding as utilized to videoconferencing to be able to increase the standard of videoconferencing photographs particularly within the facial zone. Modal-based coding is a content-based coding process used to code man made items that experience turn into a big a part of video content material. It ends up in super low bit premiums simply because basically the parameters had to signify the modal are transmitted. Model-based coding is integrated to supply history info for the bogus item coding in MPEG-4. finally, MPEG-4, the 1st coding usual for multimedia content material is defined intimately. the themes lined contain the coding of audio gadgets, the coding of common and artificial video items, and mistake resilience. complicated Video Coding is among the first books on content-based coding and MPEG-4 coding ordinary. It serves as a very good info resource and reference for either researchers and training engineers.

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Read Online or Download Advanced Video Coding: Principles and Techniques: The Content-based Approach (Advances in Image Communication, Volume 7) PDF

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Extra info for Advanced Video Coding: Principles and Techniques: The Content-based Approach (Advances in Image Communication, Volume 7)

Example text

To overcome the aperture problem, additional information from a larger neighborhood is required. This can be incorporated by imposing smoothness constraints on the optical flow field to achieve continuity or by deriving models for the projection of object surfaces onto the image plane. These two approaches are also referred to as non-parametric and parametric representations, respectively, of the motion field. Block-matching, for instance, achieves smoothness by keeping the correspondence vector constant over a whole block.

49) can also include scaling by choosing S = D R with the scaling matrix D or deformable motion by setting S = (D + R) where D is an arbitrary deformation matrix [84]. 38 CHAPTER 1. 8" Projection of pixel (X, Y, Z) onto image plane (x, y) under orthographic (parallel) projection. For motion estimation, real-world objects are often approximated by piecewise planar 3-D surfaces. This, at least locally, is a reasonable assumption. The points on such a planar patch in frame k satisfy a X + bY + c Z - 1.

Am} of L is then the set of disjoint connected components Ai such that the union of these components is equal to L; that is, tsm_lAi- L. Furthermore, a partition A - {A1,... ,Am} is finer than another partition B - {B1,... , Bn } if any pair of pixels belonging to the same component Ai also belongs to the same component Bj for some j E { 1 . . n}. An important concept regarding filters by reconstruction is the partition of fiat zones of image I. This is defined as the set of the largest connected components where the gray-level is constant.

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