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Single-pass constant- and variable-bit-rate MPEG-2 video compression
Most real-time MPEG-2 encoders are designed to perform in a constant-bit-rate (CBR) mode, in which buffer constraints are imposed to circumvent large deviations from a desired rate at any instant in time. Although such streams are generally good-quality sequences, certain types of operations or environments call for a more efficient real-time CBR encoder. The first part of the paper describes how ...Show More
An object-based approach to color subsampling
1996 IEEE International Conference on Acoustics, Speech, and Signal Processing Conference Proceedings
Year: 1996 | Conference Paper |
We propose an object-based approach to image subsampling in the chroma domain which outperforms the 4:2:0/4:2:2 chroma formats of MPEG-2 and other techniques proposed in the literature. This scheme is motivated by the fact that sharp color edges and detailed areas in the color domain represent significant visual information, and therefore, require better color definition. The object-based color su...Show More
Presents a new interframe coding method for medical images, in particular magnetic resonance (MR) images. Until now, attempts in using interframe redundancies for coding MR images have been unsuccessful. The authors believe that the main reason for this is twofold: unsuitable interframe estimation models and the thermal noise inherent in magnetic resonance imaging (MRI). The interframe model used ...Show More
A new coding scheme based on the scalar-vector quantizer (SVQ) is developed for compression of medical images. The SVQ is a fixed rate encoder and its rate-distortion performance is close to that of optimal entropy-constrained scalar quantizers (ECSQs) for memoryless sources. The use of a fixed-rate quantizer is expected to eliminate some of the complexity of using variable-length scalar quantizer...Show More
Scalar-vector quantization of medical images
1995 IEEE Nuclear Science Symposium and Medical Imaging Conference Record
Year: 1995 | Conference Paper |
A new coding scheme based on the scalar-vector quantizer (SVQ) is developed for compression of medical images. SVQ is a fixed-rate encoder and its rate-distortion performance is close to that of optimal entropy-constrained scalar quantizers (ECSQ's) for memoryless sources. For a set of magnetic resonance (MR) images, coding results obtained from SVQ and ECSQ at low bit-rates are indistinguishable....
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Show MoreAdaptive entropy constrained transform coding of magnetic resonance image sequences
Compression of magnetic resonance images (MRI) has proved to be more difficult than other medical imaging modalities, and attempts at utilizing interslice dependencies for more efficient coding have so far met with little success. On the other hand, the increasing amounts of MRI data generated every day in hospitals makes this particular data compression problem very important. In this paper, we p...Show More
Edge-based subband VQ techniques for images and video
A key issue in subband coding is the efficient compression of the less informative but perceptually important upper frequency bands of the decomposed image. A new approach capable of effectively encoding the upper-bands is described. An intra-band vector quantization (VQ) technique is employed for compression of the base-band while the upper frequency bands are encoded by a hierarchical inter-band...Show More
Adaptive entropy coded DCT coding of magnetic resonance image sequences
Proceedings of 1994 IEEE Nuclear Science Symposium - NSS'94
Year: 1994 | Conference Paper |
Cited by: Patents (1)
Compression of magnetic resonance (MR) image sequences have proved to be difficult as compared to other medical imaging modalities. Some of the factors partially responsible for this are significant amount of noise and image artifacts which are present in a 3-D MR dataset. Another factor is use of unsuitable intensity matching techniques in removal of inter-slice dependencies. In this paper we int...Show More
Interslice coding of magnetic resonance images using deformable triangular patches
Proceedings of 1st International Conference on Image Processing
Year: 1994 | Conference Paper |
Cited by: Papers (3)
We present a new inter-frame coding for medical images, in particular magnetic resonance (MR) images. Until now, attempts in using inter-frame redundancies for coding MR images have been unsuccessful. We contend that the main reason for this is twofold: bad inter-frame estimation models and ignoring the thermal noise inherent in MRI. Our inter-frame model is a continuous affine mapping based on (a...Show More
Predictive vector quantization using a neural network
1993 IEEE International Conference on Acoustics, Speech, and Signal Processing
Year: 1993 | Conference Paper |
Cited by: Papers (3)
Predictive vector quantization (PVQ) of images using two novel coding approaches is considered. The first scheme, namely, address-PVQ, exploits the inter-vector (block) dependencies by predicting the VQ address of the current block from the addresses of the previously encoded blocks. A three-layer perceptron was used as an address-predictor with the position of the residual address being encoded. ...Show More
An interframe dynamic FSVQ codec for video sequence coding
[Proceedings] ICASSP-92: 1992 IEEE International Conference on Acoustics, Speech, and Signal Processing
Year: 1992 | Conference Paper |
Cited by: Papers (1)
An interframe vector quantization scheme with finite memory called dynamic finite-state vector quantization (DFSVQ) is presented. The encoding of a current input vector consists of a subcodebook, representing the best matchable code vectors, selected from a larger codebook, i.e., a supercodebook. The choice for the entries in the supercodebook is based on the information obtained from the previous...Show More
Subband coding of video using an edge-based vector quantization technique for compression of the upper bands
[Proceedings] ICASSP-92: 1992 IEEE International Conference on Acoustics, Speech, and Signal Processing
Year: 1992 | Conference Paper |
Cited by: Papers (8)
A new subband video coding technique is introduced which utilizes several memoryless vector quantizing (VQ) schemes for encoding the various layers. A set of quadrature mirror filter banks was applied to the motion compensated frame differences (MCFDs) of the moving sequences to produce seven nonuniform bands. The upper bands displayed a significant amount of information at edge locations, these b...Show More
Analysis of Waveguiding Structures Employing Surface Magnetoplasmons by the Finite-Element Method (Short Paper)
The dispersion relation and electromagnetic field distributions for a gyroelectrically loaded waveguiding structure are obtained utilizing finite-element techniques. The structure considered consists of two layers, one a dielectric and the other a semiconductor, bounded by two perfectly conducting planes. The finite-element solution for the lowest real branches in the dispersion spectrum was compa...Show More
Theoretical Considerations on the Use of Circularly Symmetric TE Modes for Digital Ferrite Phase Shifters (Correction)
Recently, we have become aware of increased publication activity by authors who refer to the above early paper. We felt that it is particularly timely, therefore, to inform those concerned that in the above paper a few formulas, unfortunately, are in error.Show More
Finite Element Analysis Applied to Gyroelectrically Loaded Waveguiding Structures
1985 IEEE MTT-S International Microwave Symposium Digest
Year: 1985 | Conference Paper |
Cited by: Papers (2)
A finite element formulation has been used to obtain the dispersion relation for a single dielectric-semiconductor interface bounded by two perfectly conducting planes. This system represents a suitable canonical problem for the design of non-reciprocal devices such as circulators, isolators, and phase shifters. The finite element solution for the dispersive behavior was compared against the exact...Show More
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