Chapter 2 Getting to Know Your Data Yubao (Robert) Wu Georgia State University

Chapter 2 Getting to Know Your Data Data Objects and Attribute Types Basic Statistical Descriptions of Data Data Visualization Measuring Data Similarity and Dissimilarity

Printer Forensics ? Printer Forensics Based on Page Document's Geometric Distortion Yubao Wu, Xiangwei Kong, Xingang You, and Yiping Guo IEEE International Conference on Image Processing (ICIP), 2009

Printer Forensics scan Digital Image Feature extraction  Darkness  Dots around the letters SVM

print scan PDF FileScanned Image Printer Forensics Based on Page Document's Geometric Distortion Yubao Wu, Xiangwei Kong, Xingang You, and Yiping Guo IEEE International Conference on Image Processing (ICIP), 2009

Least Squares – Slope of Each Line X-coordinate of “e” in one line Y-coordinate Printer Forensics Based on Page Document's Geometric Distortion Yubao Wu, Xiangwei Kong, Xingang You, and Yiping Guo IEEE International Conference on Image Processing (ICIP), 2009

Slope of Each Line Line Number Matlab - plot Why are the slopes monotonically increasing? Printer Forensics Based on Page Document's Geometric Distortion Yubao Wu, Xiangwei Kong, Xingang You, and Yiping Guo IEEE International Conference on Image Processing (ICIP), 2009

IdealIn practice Age of the Printer !

Experimental Results Each data point = 1 Page = 1 Scanned Image 100% Accuracy Scatterpl ot

Feature Extraction == Data Reduction Original Scan Image 2550 x 3508 pixels 41 lines; 72 “e” in each line 41 x 72 = 2911 data points 41 slopes for the 41 lines 2550 pixels 3508 pixels 41 double values

Matlab Plot Function plot(vX,vY,'kx'); hold on; Matlab default settingsModify the Settings

Matlab Plot Function plot(X,Y,'kx'); hold on; Matlab Default Settings Modify the Settings hFigHandle = figure(1); set(gca,'FontSize',40); plot(X,Y,'kx','LineWidth',4,'MarkerE dgeColor','k','MarkerFaceColor','w', 'MarkerSize',20); hold on; xlim([1 30]); ylim([ ]); set(hFigHandle, 'Position', [ ]);

Text Cloud

Fisher’s Iris Data Scatterplo t

Fisher’s Iris Data

Microsoft Bing MapsGoogle Maps

ColorBrewer 2.0 How to Choose Colors? Matlab LineSpec (Line Specification) SpecifierColor rRed gGreen bBlue cCyan mMagenta yYellow kBlack wWhite Microsoft PowerPoint

How to Choose Qualitative Colors?

Qualitative Colors

Sequential Colors

Data-driven documents

The Open Graph Viz Platform