Old Dominion University Signal Processing Aspects of the Visualization of Scientific Data: An Overview Dennis Bergin dberg007@odu.edu MSIM 842 Old Dominion University

Signal Processing Aspects of the Visualization of Scientific Data: An Overview Motivation Explore visualization of scientific data to improve presentation of dissertation research Signal analysis & modification for real-time virtual pathology Objectives Signal Processing in Visualizing Scientific Data Spiral for Visualization of Serial Periodic data Research Visualization of Cardiac & Breath Sounds Improve Visualization in Presentations Literature Search Signal Processing Aspects of Scientific Visualization, R. Moorhead R., Z, 1995. Interactive Visualization of Serial Periodic Data, John Carlis, 1998. Investigations into Visualization and Significance of Phase Relationships in Cardiac Rhythms, Eldon Nelson. Heart and Breath Sound Visualization work by Hiroshima Makino, American Society of Anesthesiologists, 2002-2004,

The Visualization Process Scientific Visualization Temperature Pressure Humidity Salinity Density Velocity Stress Shape Color Opacity Mapping Numbers To Imagery Sound Visualization Visualization Types Exploratory or Interactive

Signal Processing Issues Presentation of Scientific Data Aliasing Color Models Automatic Feature Extraction Filtering Data Compression Multiresolution

Signal Processing Issues Issues with Visualization of Time-Invariant 2D Data Scalar Contours Shading Multivariate Visual Ambiguity Screen Clutter Visual Distortion Techniques “Colorwheel” Streamlines Line Interval Convolution Critical Point Analysis

Serial Periodic Data Traditional Approaches REQUIRES: Simultaneous display of serial and periodic attributes (e.g. seasonality) Traditional Approaches Timelines for Temporal Data Dynamic Query Systems/Starfield Displays Focus+Context /Zoom Calendar Visualization

Spiral Visualization Year-month Consumption % For 12 Highly Consumed Foods, 1980 – 1988 Indented Spiral, With Spokes Monthly Consumption %, 1980 – 1988 Monthly Consumption % For All 112 Foods During the period 1980 – 1988

Average and Maximum Groups Sizes for 2 Chimpanzees Spiral Visualization Tightening a Spiral View of Sound Data from 5 Instruments. Average and Maximum Groups Sizes for 2 Chimpanzees Single Spoke of a Spiral Display of Neuron Firing Frequencies

Visualization of Cardiac Rhythms and Breathing Sounds Phase Relationship of the EKG Data Graph Investigations of Eldon Nelson

Visualization Work by Hiroshima Makino Visualization of Heart Murmur

Visualization of Cardiac Rhythms and Breathing Sounds 3D Visualization of Breadth Sounds Using Visualization Sound Color Software

Visualization Work by Hiroshima Makino 3D Breathing Sounds Color Visualization

Signal Processing Aspects of the Visualization of Scientific Data: An Overview Comparison of Related Publications Nelson and Carlis identify need for better ways to classify scientific data. Not a great deal of work in this area. Makino, Nelson research in visualizing sound data Much research in sonification of data - different, but related Strengths & Weakness of the Content Good job of identifying needed areas of improvement Sufficient overview of signal processing aspects of scientific data visualization Lacking details for implementing spirals Makino’s work was described clearly and concisely in abstracts

Signal Processing Aspects of the Visualization of Scientific Data: An Overview Useful Applications & Possible Extensions of Work Spirals for Visualization of Seasonal & Frequency Data Musical, Pathology, and Other serial periodic data Impact on the State of the Art Spirals Effective to Visualize Serial Periodic Data Provides visual cues to both serial and periodic aspects of the data, and interactions such as the change in period over time Multiple Common Data Sets and Multiple-link Views, Data Exploration