Journal ArticleDOI
Image sequence coding using oriented edges
TLDR
A directional decomposition based sequence coding technique is presented, in which spatial lowpass and highpass components are analyzed and coded separately, and a simple law for sharing the available bits between these components is stated and analytically proved.Abstract:
Second generation image coding techniques, which use information about the human visual system to reach high compression ratios, have proven very successful when applied to single images. These methods can also be applied to image sequences. A directional decomposition based sequence coding technique is presented, in which spatial lowpass and highpass components are analyzed and coded separately. A simple law for sharing the available bits between these components is stated and analytically proved by using a minimum cost/resolution optimality criterion. The detection of directional elements is carried out by using both linear and nonlinear (median) filtering. The coding is based on near optimal estimators which retain only the innovation part of information, and is well suited for differential pulse code modulation. The results of applying this method to a typical sequence are shown. The estimated compression ratio is approximately 320 : 1 (0.025 bits per pixel), allowing a transmission rate of about 41 kbit/second. The resulting image quality is reasonably good.read more
Citations
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Patent
Image encoding and decoding method and apparatus using edge synthesis and inverse wavelet transform
TL;DR: In this paper, a digitized image is encoded by detecting edges in the image, encoding the position and sharpness of the detected edges, filtering the image by a low-pass filter to generate a lowfrequency image, and encoding the low-frequency image.
Journal ArticleDOI
New trends in very low bitrate video coding
T. Ebrahimi,E. Reusens,Wei Li +2 more
TL;DR: Three techniques will be discussed in details, because of their ability to successfully achieve very low bitrate video coding with a reasonably good quality, and an approach called "second generation" which has already shown its potential to efficiently code still images at higher compression factors.
Journal ArticleDOI
Fine estimators of two-dimensional parameters and application to spatial shift estimation
TL;DR: A fast technique for fine estimation of two-dimensional (2-D) parameters, based on a parabolic interpolation of the same ambiguity function samples, and aimed at block-oriented estimation of the spatial shift between pairs of images in video sequences is presented.
Journal ArticleDOI
Estimation of global motion parameters by complex linear regression
Gaetano Giunta,U. Mascia +1 more
TL;DR: The aim is to get a simple method to estimate in a reliable may a set of parameters that can take into account the presence of a global motion component, using only local information.
References
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Book
Computer image processing and recognition
TL;DR: A systematic introduction to the concepts and techniques of computer image processing and recognition is presented in this paper, where the authors give an overview of such topics as image formation and perception; computer representation of images; image enhancement and restoration; reconstruction from projections; digital television, encoding, and data compression; scene understanding; scene matching and recognition; and processing techniques for linear systems.
Journal ArticleDOI
Recent results in high-compression image coding (Invited Papaer)
Murat Kunt,M. Benard,R. Leonardi +2 more
TL;DR: Recent results on object-based coding methods are reported, exhibiting improvements in the previous second-generation methods.
Journal ArticleDOI
A maximum likelihood framework for determining moving edges
TL;DR: In this paper, an approach that relies on modeling principles and likely hypothesis testing techniques is proposed for the determination of moving edges in an image sequence, where a spatio-temporal edge is modeled as a surface patch in a 3D spatiotemporal space.
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