Vol. 12 (2003):
Abstracts of Papers
No. 1: Special Issue on Diagrammatics & Design
(Selected papers from the 1st European Workshop on "Diagrammatics and Design"),
No. 2,
No. 3,
No. 4.
Reprints of the papers may be obtained from their authors;
contact Editorial Office in case you need the address
of the respective author.

 Editorial Office, MGV
Institute of Computer Science
ul. Ordona 21
01237 Warszawa, Poland

 <mgv@ipipan.waw.pl>
Special Issue on Diagrammatics
& Design (Selected papers from the 1st European Workshop
on "Diagrammatics and Design").
Special Issue Editors: Ewa Grabska,
Zenon Kulpa.
 Grabska E., Kulpa Z.:
Guest Editorial: Diagrammatics and Design.
MGV vol. 12, no. 1, 2003, pp. 34.

Grabska E.:
Design and reasoning with diagrams.
MGV vol. 12, no. 1, 2003, pp. 516.

In this paper a new framework for conceptual design based on diagrammatic
reasoning is sketched. The approach considers a dynamic context for design.
The main phases of the design process are treated as different classes of
situations in the appropriate worlds and as such they belong to their own
classifications domains. The notion of classification allows one to model
constraints that govern the construction diagrams to be drawn or generated.
Key words: diagram, diagrammatic reasoning,
action, conceptual design, design requirement.

Bailin S. C.:
Diagrams and design stories.
MGV vol. 12, no. 1, 2003, pp. 1737.

We present a theory of design stories that structurally
distinguishes a "story" from other forms of documentation.
We examine how design diagrams might convey such stories,
and how an implicit story can be made more explicit through
diagrammatic cues and annotations. We develop these ideas
in the context of a reallife design process. Members
of the design team themselves found it a challenge
to recall the rationale for various decisions. We present
a series of diagrams that discloses the underlying progression
of ideas, and we show how this story may be tooopaquely
packaged in the "final" diagram that the team produced.
Key words: diagrams, design story, narrative,
rationale, documentation.

BarkerPlummer D., Etchemendy J.:
Applications of heterogeneous reasoning in design.
MGV vol. 12, no. 1, 2003, pp. 3954.

The task of designing a complex artifact can be thought of
as reasoning within a space of alternatives. This reasoning shares
the largescale structure of logical proof: the elucidation
of information as the design is fleshed out, and hypothetical
reasoning concerning the consequences of various possible
design decisions, for example. However, design reasoning
differs from the kind of reasoning usually considered
by logicians because it involves reasoning with multiple
representations of information, and with complex rationale
and goal structures. We describe an architecture
for building applications to support design reasoning
which generalizes traditional notions of proof
to the case of realworld problem solving,
including design reasoning.
Key words: heterogeneous reasoning, design,
computational architecture.

Palacz W.:
Representing design ideas with hierarchical
graph diagrams .
MGV vol. 12, no. 1, 2003, pp. 5560.

Graphs are often used as formal models for representing design ideas.
Models based on hierarchical graphs are needed in order
to conveniently represent the structures of reallife objects.
This paper presents a proposal of a design system which
uses hierarchical graph transformation rules to automate
the process of generating graph diagrams.
Key words: design, hierarchical graphs,
doublepushout transformation rules.

Biegus L., Branki C.:
Bipartite graph approach to coordinating disparate
workflows.
MGV vol. 12, no. 1, 2003, pp. 6171.

This paper presents a way of modelling and executing intercompany
workflows that require parallelsynchronised interoperability approach.
The modelling is carried out using the concepts of coordination dialogue
and bipartite graphs. Execution requires a kind of messaging service,
which can conveniently be implemented with software agents.
Key words: workflow interoperability, coordination,
bipartite graphs, agents.

Toland J.:
Reference diagrams.
MGV vol. 12, no. 1, 2003, pp. 7382.

This paper discusses a class of diagrams that are often referred to
by both experts and novices in any given domain of activity.
This type of diagram is given the term 'Reference Diagram'.
The paper will outline a definition of what the term 'Reference
Diagram' alludes to as well as outline the characteristics
of such diagrams. A case study is then reported which highlights
a particular domain of activity (CaseBased Reasoning) and provides
example of the class of diagrams in question. Furthermore,
it is suggested in this paper that such is the importance
of Reference Diagrams that they should be collected in order
to maintain ease of access. This can be done in much the same way
as with a set of maps, a compilation of pictures, a dictionary
or thesaurus of words or an anthology of literature,
such as a set of academic papers and articles of a particular domain.
Key words: reference diagrams, teaching and learning
diagrams, educational diagrams, classification of diagrams.

Riznyk V.:
Application of the combinatorial sequencing
theory for innovative design based on diagrammatics.
MGV vol. 12, no. 1, 2003, pp. 8398.

The paper proposes application of the combinatorial sequencing theory,
namely the concept of Ideal Ring Bundles (IRBs), for design of high
performance engineering devices or systems with nonuniform structure
based on diagrammatics approach. An ordinary IRB is a ringlike
sequence of positive integers which form perfect partitions
of a finite interval [1,S] of integers. The sums of connected
subsequences of an IRB enumerate the set of integers [1,S]
exactly once. This property makes IRBs useful in applications
which need to partition sets with the smallest possible number
of intersections. Application of the idea of "perfect" combinatorial
configurations for innovative design provides a better understanding
of the role of a geometric structure in behavior of natural
and manmade objects. It also helps configure systems with fewer
elements and bonds than at present, while maintaining
or improving on reliability, precision, resolving ability,
and functionality, using combinatorial techniques based
on the remarkable properties and structural perfection
of one and multidimensional IRBs. The objectives of the IRB
concept are: development of a scientific basis for technologically
optimum distributed systems theory using diagrammatic,
generalization of these methods and results to the improvement
and optimization of a larger class of technological systems,
and development of new directions in fundamental and applied
research in systems engineering based on diagrammatics for designing
a whole range of highperformance devices, systems, or technologies,
including applications to coded design of signals for communications
and radar, positioning of elements in an antenna array, and other
areas to which the IRB concept can be applied.
Key words:
perfection, harmony, optimization, numerical diagram,
geometrical diagram, innovative design, monolithic code,
vector data code, nonredundant scale, vector data logistic management.

Shimojima A.:
What makes a system less graphical?.
MGV vol. 12, no. 1, 2003, pp. 99115.

Certain representation systems, loosely called "linguistic" ones,
seem to lack the inferential efficiency, the expressive inflexibility,
and the expressive richness possessed by certain other systems,
loosely called "graphical" ones. This paper investigates
the semantic mechanism underlying this intuitive phenomenon,
and attributes a reason to the fact that semantic interpretation
in "linguistic" systems is only applied to fairly specific
properties of representations.
Key words: graphical representation,
linguistic representation, diagrammatic reasoning,
nonverbal communication, semantics of graphics.

Drewes F., Hoffmann B., Minas M.:
Contextexploiting shapes for diagram transformation.
MGV vol. 12, no. 1, 2003, pp. 117132.

DiaPlan is a language for programming with graphs representing
diagrams that is currently being developed. The computational model
of the language  nested graph transformation  supports nested
structuring of graphs and graph variables, but is still intuitive.
This paper discusses structural typing of nested graphs and nested graph
transformation systems by shape rules.
We extend the contextfree shape rules proposed in earlier work
to contextexploiting shape rules with which many relevant
graph structures can be specified. The conformance of a nested graph
to the shape rules is decidable. If a transformation system conforms
to shape rules as well, it can be shown to preserve shape conformance
of the graphs it is applied to. This sets up a static type discipline
for nested graph transformation.
Key words: graph transformation, diagram language,
visual programming, data type.

Le T. L., Kulpa Z.:
Diagrammatic spreadsheet.
MGV vol. 12, no. 1, 2003, pp. 133146.

The diagrammatic spreadsheet concept is an attempt to develop
a fully interactive animated diagrammatic system in which
the transformation and animation of the diagram is interactively
available to the user in a clickanddrag mode, and the description
of what elements can move, and in what way (according to the required
constraints between their components) can be also easily
and interactively defined by the user. A constraint is used here
like a formula in a spreadsheet, which is employed to automatically
recompute the value of a cell whenever any other cells bound to it
by the constraint undergo change. The graphical elements
of the diagram play the role of spreadsheet cells, and their
various attributes constitute the cell contents. The system
may be used by human users for interactive exploration of diagrammatic
representation and reasoning problems, or as a frontend
to a more automatic diagrammatic inference system. In the paper,
an overview of this concept and general construction principles
of the system are described.
Key words: diagrams, diagrammatic representation,
diagrammatic reasoning, graph transformations, diagrammatic spreadsheet,
CPgraphs.

Kulpa Z.:
Selfconsistency, imprecision, and impossible cases
in diagrammatic representations.
MGV vol. 12, no. 1, 2003, pp. 147160.

The main argument against the use of diagrams in rigorous reasoning
is that they are unreliable. Thus, a serious error source analysis
for this kind of reasoning should be undertaken, and proper
diagrammatic reasoning procedures formulated as a result. As yet,
little has been done in this matter. In this paper, one aspect
of this problem is addressed, namely errors resulting in generation
of socalled impossible cases in diagrammatic representations,
violating the property of selfconsistency claimed to hold for them.
It is shown that the lack of selfconsistency is in general due
to limited analogicity of many diagrammatic representations,
either because of limited precision of diagrams, or of certain
structural properties of the visual language used.
Several examples of these effects are shown and analyzed informally,
with suggestions for possible remedies and for more formal analysis
of the effects.
Key words: diagrammatic representation,
diagrammatic reasoning, diagrammatic reasoning errors,
analogicity limits, selfconsistency, diagram imprecision,
impossible cases, impossible figures.

Wang Y., Bhattacharya P.:
Using connected components to guide image understanding
and segmentation.
MGV vol. 12, no. 2, 2003, pp. 163186.

In this paper, we propose a method for understanding an image with
the help of the theory of parameterdependent connected components
developed by us in a previous work. We may study various properties
of an image at the connected component level, from the low level
vision to an intermediate level vision. Using the information
obtained from various component histograms and certain preknowledge,
we describe how to select suitable values of the parameters so that
an object in a gray image may be represented by a parameterdependent
component. Segmentation of the object could be conducted by locating
the corresponding component. Our approach can be applied to a wide variety
of images as we do not make any assumptions about the image formation
model, and the method is independent of the type of the grid system used
for the digitization process and the type of pixel adjacency relation.
Key words: gray image, connected components,
image understanding, segmentation, intermediate level vision.

Holden E.J., Owens R.:
Representing the fingeronly topology for hand shape
recognition.
MGV vol. 12, no. 2, 2003, pp. 187202.

Automatic recognition of hand shapes in a moving image sequence requires
the elements of hand tracking, feature extraction and classification.
We have developed a robust tracking algorithm and a new hand shape
representation technique that characterises the fingeronly topology
of the hand by adapting an existing technique from speech signal
processing. The tracking algorithm determines the centre of the largest
convex subset of the hand throughout an image sequence, using a combination
of pattern matching and condensation algorithms. A hand shape feature
represents the topological formation of the fingeronly regions
of the hand using a Linear Predictive Coding parameter set called
cepstral coefficients. Feature extraction is performed on the polar
dimensions of the hand regionofinterest, by tracking the fingeronly
region and extracting euclidean distances between the fingeronly contour
and the hand centre, which are then converted into cepstral coefficients.
Experiments are conducted using muggrabbing sequences to recognise
four different hand shapes. Results demonstrate the robustness of hand
tracking on cluttered backgrounds and the effectiveness of the hand
shape representation technique on varying hand shapes.
Key words: hand shape representation, hand tracking,
gesture recognition.

Yeates S., Holden E.J., Owens R.:
An Animated Auslan Tuition System.
MGV vol. 12, no. 2, 2003, pp. 203214.

The Auslan Tuition System uses a computer generated signer to provide
a flexible, visual Australian Sign Language (Auslan) educational tool.
Signs are generated and animated by our generic Human Modelling System
that is implemented in crossplatform objectoriented C++. The Human
Modelling System consists of three modules: the core Human Modelling
Module for model construction, manipulation and forward kinematics;
the Model Rendering Module for displaying model configuration visually
using OpenGL; and the Model Interpolation Module, for providing flexible
partialkeyframe interpolation and animation control. These modules
form the basis of the Auslan Tuition System, and allow the display
of categorised sign phrases, interactive fingerspelling and contextual
sign dialogue examples. The user has complete viewing control
of sign display and animation, running on modest hardware.
Key words: human movement animation, sign language
translation, human modelling.

Kämpke T.:
Label placement for dynamic objects.
MGV vol. 12, no. 2, 2003, pp. 215234.

Placing object labels in dynamic scenes requires the label positions
themselves to be dynamic. Algorithms for dynamic label placement are
presented that tend to avoid overlaps and consider aesthetic preferences.
The procedures are derived from a quadratic program. As a special
feature, hysteresis is incorporated to restrict the optical flow
induced by label changes.
Key words: graphical user interface, mixed reality,
optical flow, quadratic programming.

Klette G.:
A comparative discussion of distance transforms and simple
deformations in digital image processing.
MGV vol. 12, no. 2, 2003, pp. 235256.

The paper discusses algorithms for extracting essential properties
of binary objects in digital images which are either based on
distance transforms defined by different metrics or algorithms
based on simple shape deformations. Thinning algorithms define
oneway simple deformations. Twoway simple deformations transfer
object points into background points and vice versa, without
destroying the image topology. This article reviews
contributions in this area with respect to properties of
algorithms and characterizations of simple points, and informs
about a few new results. A main intention of this article is the
comparative discussion of experimental results and theoretical
equivalences.
Key words: shape simplification, skeletonization,
thinning, distance transform.

Horgan G. W.:
Variance and autocovariance filters for flexible and efficient
texture assessment.
MGV vol. 12, no. 2, 2003, pp. 267278.

The variance of image intensities in a moving window is an indicator
of texture which can be calculated very efficiently and perhaps deserves
to be more widely used. Ways in which it can be extended to comparisons
of responses with different window sizes, to calculation of lagged
autocorrelations and to anisotropic measurements are described
and illustrated.
Key words: texture, variance, autocovariance.

Eghbali H. J.:
Adaptive digital image filtering in wavelet domain.
MGV vol. 12, no. 2, 2003, pp. 279290.

In recent years wavelet transforms have been widely used for image
denoising. This is because wavelet transform represents both the stationary
and the transient behavior of the image. In this paper an adaptive filtering
method is used for removing additive white Gaussian noise. It is based
on statistics estimated from a local neighborhood of each wavelet
coefficient. Denoising results compare favorably to the shrinkage
denoising method, both perceptually and in terms of signal to noise
ratio (SNR). The performance of the method is compared
to shrinkage denoising method for both low and high (SNR) images.
Key words: image denoising, wavelet coefficients,
shrinkage, statistic, adaptive filtering.

Madi M., Walton D.:
An interactive modification data structure
for 3D surfaces.
MGV vol. 12, no. 3, 2003, pp. 293310.

The design and display of 3D models on a computer screen is usually
interleaved by a series of data manipulations.
Data are usually sets of 3D points that make up
polygonal patches in the composition of polyhedral models.
Manipulations are the transformation operations
that are applied to points to facilitate design and visual understanding
of the graphical models. To further facilitate and speed up the design
phase, methods are proposed to interactively segment
and modify selected subsurfaces, thereby limiting the number
of patches that need to be manipulated for computationally
cheaper and faster results. This paper illustrates how polyhedral
surfaces can be organized into special data structures to facilitate
rapid selection of vertices, and how those same surfaces can be segmented
into subpolyhedra for zooming and vertex manipulation during design,
and can then be reintroduced as modified segments into the original
structure. Algorithms and visual examples are also provided to support
the work.
Key words: 3D surfaces, vertex selection,
surface manipulation, triangularloop data structure (TLDS).

Dharmaratne A., Harada K.:
Vertex correspondence between polygons in different
applications.
MGV vol. 12, no. 3, 2003, pp. 311333.

This paper describes some applications in computer graphics and
computational geometry where establishing a vertex correspondence
between a pair of objects is necessary. We present an algorithm
for establishing a correspondence between the vertices of a pair
of polygons by inserting new vertices, regardless of the polygons'
locations, orientations, sizes, shapes, or numbers of vertices.
The new vertices can be inserted either at the existing vertices
or along the corresponding edges of the polygons.
After establishing a successful correspondence between the vertices,
its role in compatible convex decompositions, skeleton construction
and polygon morphing is discussed.
Key words: vertex correspondence,
polygon morphing, compatible convex decomposition.

Wyatt R.:
Face diagrams.
MGV vol. 12, no. 3, 2003, pp. 335352.

We describe a method for succinctly summarizing
multidimensional data. It involves using computergenerated
diagrams of faces in which the size of each feature is
proportional to some parameter or dimension. Unlike the previous
attempts by researchers to use face diagrams, our method insists
that all facial features have constant locations, standard shapes
and identical maximum possible sizes. This minimizes any tendency
for observers to notice some facial parameters more than others or
to interpret the face emotionally. We then present a case study
in which our face diagrams were used by some advicegiving
software to pictorialize different people's respective planning
styles. The ability of our method to prompt new and deeper
insights is highlighted.
Key words: multidimensional data, face diagrams,
graphic communication, diagramming, decision making, planning.

Valev V., Asaithambi A.:
Fuzzy nonreducible descriptors.
MGV vol. 12, no. 3, 2003, pp. 353361.

We present a model for supervised pattern recognition problems in which
the features of patterns are fuzzy numbers. NonReducible Descriptors (NRDs)
for such problems are obtained through the use of a threshold value,
which is calculated based on the distance between patterns defined
in a manner similar to Hamming distance between binary sequences.
Boolean formulas are used to represent these Fuzzy NRDs. This model
is useful in a wide variety of applications, and we illustrate
its usefulness with a medical application.
Key words: supervised pattern recognition,
fuzzy nonreducible descriptors, severe acute respiratory syndrome.

He X.C., Yu S.S., Zhou J. L., Li J.:
Context based multiwavelet image coding using SPIHT
framework.
MGV vol. 12, no. 3, 2003, pp. 363376.

In this paper, multiwavelets are considered in the context of image
compression. For evaluating the effectiveness of multiwavelet transform
for coding image at low bitrates, an efficient embedded coding
of wavelet coefficients has been realized. Firstly, selecting
the BSA(4/4)^{*} filters, twodimensional (2D) image
is transformed with our proposed algorithm I. Secondly; we split
the coefficients into two parts, namely the significance map
and the residue map. Then a new modified algorithm for set partitioning
in hierarchical trees (SPIHT) is proposed prencoding the significance map.
Further, algorithm III is presented for coding the residue map.
Finally, we adopt contextbased adaptive arithmetic coding to encode
the bit stream. We also provide some experimental results proving
that multiwavelets are worth studying, and compare them with those
of other multiwavelet and scalar wavelet algorithm.
Key words: multiwavelet, image compression, SPIHT,
adaptive arithmetic coding, context.

Lukac R.:
Effective neural LUM smoother for image smoothing
applications.
MGV vol. 12, no. 3, 2003, pp. 377391.

In this paper, an effective image filtering approach for the impulsive
noise suppression with the simultaneous signaldetail preservation
is presented. The novelty of the proposed method lies in the combination
of the LUM (loweruppermiddle) smoothing characteristics and the neural
network. The included LUMbased impulse detector improves the signaldetail
preservation capability of the proposed method, whereas the neural network
along with the input LUM smoothers guarantee its noise attenuation
capability. Since the LUM operation can be very efficiently implemented,
the proposed method is computationally attractive and useful for practical
image filtering applications.
Key words: LUM smoothers, impulsive noise,
adaptive filtering, neural network, backpropagation, noise
removal, image processing.

ElHenawy I., ElAreef T., Karawia A. A.:
On wavelets applications in medical image denoising.
MGV vol. 12, no. 3, 2003, pp. 393404.

An important application domain of the wavelet theory is denoising.
In this paper, we use the wavelet transforms to denoise the medical images.
There are many kinds of noise and we study only three types i) additive
random noise, ii) pop noise and iii) localized random noise.
Further, we use Root Mean Square Error(RMSE) and Signal to Noise
Ratio (SNR) to measure the error between a noisy image
and the original image.
Key words: wavelet transform, noise modeling,
image processing.
 Kowalczyk M.:
Two and a half dimensional models of convex polyhedra
for visual identification.
[Dissertation abstract]
MGV vol. 12, no. 3, 2003, p. 405.
 Kowalczyk M., Mokrzycki S.W.:
Methods for generating 3D exact views of convex polyhedra
for visual identification.
Part I: View sphere with perspective projection
and iterative methods.
MGV vol. 12, no. 4, 2003, pp. 409433.

The paper studies the methods of generating 3D exact multiview models
of convex polyhedra for visual identification systems. In particular,
an original view space concept (a view sphere with perspective projection)
and the representation completeness controlling concept (a view sphere
covering by singleview areas) as well as two groups of methods:
iterative (part I of the paper) and noniterative ones (part II)
are characterized. A set of views generated by each method forms
a complete view representation which is verified by controlling
the view sphere covering by the so called singleview areas).
The perspective projection used for calculating the views,
the complete, tight covering of the view sphere by the singleview
areas and 3dimensionality of the views ensure unambiguous
and proper identification of polyhedral objects.
Part I of our study presents the view sphere with perspective
projection concept, the view sphere covering by the singleview
areas mechanism, and the iterative methods generating featuredependent
views and reaching a complete view set through an iterative process
of views generation.
Key words: object representation, distinguished features,
3D exact multiview model, visual object identification, view sphere
with perspective projection, standardised views.
 Kowalczyk M., Mokrzycki S.W.:
Methods for generating 3D exact views of convex polyhedra
for visual identification.
Part II: Noniterative methods, implementation and test
results.
MGV vol. 12, no. 4, 2003, pp. 435452.

This paper is the second part of our study describing methods
for obtaining a 3D multiview exact and complete model of convex
polyhedra used for visual identification. Noniterative methods,
like the iterative ones, explore the concept of the view sphere
with perspective projection and the view sphere covering
as a mechanism for representation completeness.
The noniterative methods consist in calculating a view, determining
the corresponding singleview area (the socalled seedling
singleview area) and then searching for the neighbouring
singleview areas (generating the views at the same time)
in a spiral way until the whole view sphere is covered by the latter.
Having a complete set of the singleview areas (complete view sphere
covering), we get a complete set of views as well. Test results
and computational complexity estimation are also included.
Key words: object representation, distinguished features,
3D exact multiview model, visual object identification, view sphere
with perspective projection, standardised 3D views.
 Ababsa F., Roussel D., Mallem M.:
Structured light 3D free form recovering with subpixel
precision.
MGV vol. 12, no. 4, 2003, pp. 453476.

This paper deals with the 3D Free form object pose recovering problem
that is present in several industrial applications, such as online
quality control in production as well as image systems for assembly/welding,
augmented reality and robotics. The method presented here uses a structured
light based vision system to reconstruct several accurate local 3D patches
of the objects. A robust subpixel method for image features detection
has been developed in order to increase 3D reconstruction accuracy.
The curvature method is then used to compute a geometric invariant
"footprint" to discriminate reconstructed patches, which allows
to match them with the object's model. Pose recovering is performed
by using the predictionverification hypotheses paradigm.
Some experimental results are given to show the efficiency
of the proposed solution when applied to a complex free form object.
Key words: free form object, structured light,
subpixel detection, 3D recovery, matching, geometric invariant,
recognition by indexation.
 Xu X.L., Harada K.:
Sequential projective reconstruction with factorization.
MGV vol. 12, no. 4, 2003, pp. 477487.

The objective of the present study is to propose a new sequential
projective factorization approach for recovering the structure and motion.
In contrast to the previous sequential factorization methods or nonlinear
filter methods, it starts with the first two images and the accurate result
can be obtained even for the first image pair without considering provision
of a reliable initial estimation. In each recursive step, the infinite
sequences can be effectively handled while keeping the size
of the factorization matrix unchanged. The experimental data
in the paper show that sufficient accuracy can be attained
with absence of noise.
Key words: sequential, projective factorization,
structure from motion.
 Jurek J.:
On the construction of transition functions for DPLL(k)
automata for syntactic pattern recognition
MGV vol. 12, no. 4, 2003, pp. 489513.

DPLL(k) automata have been introduced as a tool for inference
support in pattern recognitionbased realtime expert systems.
The automata can be characterised by the two following features:
they can recognise languages of a big descriptive power
(quasi context sensitive languages), and they are efficient
(i.e. they are of linear computational complexity). The two features
make the automata useful in case of many practical applications,
such as the online analysis of complex trend functions describing
behaviour of industrial equipment. In this paper we present a method
for construction of transition functions for the automata and a formal
proof of its correctness.
Key words: syntactic pattern recognition,
context sensitive languages, parsing.
 Elhenawy I., Karawia A.A.:
On wavelets applications in image compression.
MGV vol. 12, no. 4, 2003, pp. 515524.

An important application domain of the wavelet theory is compression.
In this paper, we use wavelet transforms to compress two
different types of images (i) medical images (Echo image),
(ii) color images, by using two different procedures.
We use different types of wavelet transforms. Further, the compression
ratio, the bits per pixel and the relative 2norm difference are
calculated. The quantitative measures are used to compare
and contrast the performance of different wavelet transforms.
Key words: wavelet transform, image processing.
 Saitoh T., Sato M., Kaneko T., Kuriyama S.:
Transient texture synthesis based on multiple templates.
MGV vol. 12, no. 4, 2003, pp. 525537.

Texture synthesis based upon a sample image or template has attracted
much attention recently. This paper describes a new blending algorithm
for synthesizing a transient texture based upon two or more templates
that gives an impression of a gradual transition from one template
to another. Based upon a pair combination out of four templates,
we synthesize six transitional textures. Then, we shown that
various blending patterns can be designed by controlling
the blending ratio maps. Based upon investigations of unsuccessful
results of blending, we derive some necessary conditions on the
statistical properties of templates for the applicability of this
synthesis method.
Key words: texture synthesis, multiple templates,
blending, contracting.
 Reviewers' index
 Authors' index
 Contents of volume 12, 2003
Maintained by Zenon Kulpa
Last updated Feb 17, 2006