3 digitizing
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Monday, January 14, 2013
Dr Michael Tan, michael@fke.utm.my 1
DIGITIZINGUniversiti Teknologi MalaysiaDr Michael Tan Loong PengPhD (Cambridge)Senior LecturerFaculty of Electrical EngineeringUniversiti Teknologi Malaysia
Dr Michael Tan, michael@fke.utm.my
Introduction
Digitizing software • converts an image file showing a graph or map, into numbers.
The image file can come from a scanner, digital camera or screenshot. The numbers can be read on the screen, and written or copied to a spreadsheet.
Dr Michael Tan, michael@fke.utm.my
Why Would You Need This Tool?
Here are some real‐life examples:• You are an engineer with some graphs in decades‐old documents, but you really need the numbers represented in those graphs so you can do analyses that will determine if a space vehicle is safe to fly.
Dr Michael Tan, michael@fke.utm.my
Why Would You Need This Tool?
Here are some real‐life examples:• You are a graduate student gathering historical data from charts for your thesis.
• You need to get experimental data for your analysis to compare with your modeling.
• You would like to benchmark your finding with published data
Monday, January 14, 2013
Dr Michael Tan, michael@fke.utm.my 2
Dr Michael Tan, michael@fke.utm.my
Why Would You Need This Tool?
Here are some real‐life examples:• You ride a bike or boat and want to know how much distance you covered in your last trip, but you do not have an odometer or GPS unit. However, you do have a map.
Dr Michael Tan, michael@fke.utm.my
Identify Figure from Paper
Dr Michael Tan, michael@fke.utm.my
Print Screen
Dr Michael Tan, michael@fke.utm.my
Open Replica
Monday, January 14, 2013
Dr Michael Tan, michael@fke.utm.my 3
Dr Michael Tan, michael@fke.utm.my
Load Image From File
Dr Michael Tan, michael@fke.utm.my
Open Image
Dr Michael Tan, michael@fke.utm.my
Insert Full Box
Dr Michael Tan, michael@fke.utm.my
Fit the box into Axis
Monday, January 14, 2013
Dr Michael Tan, michael@fke.utm.my 4
Dr Michael Tan, michael@fke.utm.my
Dimensions
Dr Michael Tan, michael@fke.utm.my
Start Digitizing
Dr Michael Tan, michael@fke.utm.my
Export Data
Dr Michael Tan, michael@fke.utm.my
Save Data to File
Monday, January 14, 2013
Dr Michael Tan, michael@fke.utm.my 5
Dr Michael Tan, michael@fke.utm.my
Open data file using Excel
Dr Michael Tan, michael@fke.utm.my
Text Import Wizard
Dr Michael Tan, michael@fke.utm.my
Choose Tab and Space
Dr Michael Tan, michael@fke.utm.my
Select General
Monday, January 14, 2013
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Dr Michael Tan, michael@fke.utm.my
Data exported in Excel
Dr Michael Tan, michael@fke.utm.my
Plot using XY (Scatter)
Select Scatter with Smooth Lines and Markers
Dr Michael Tan, michael@fke.utm.my
End results in Excel
1.0E‐12
1.0E‐11
1.0E‐10
1.0E‐09
1.0E‐08
1.0E‐07
1.0E‐06
1.0E‐05
1.0E‐04
‐10 ‐5 0 5 10
Source Drain Current (A
)
Gate Voltage (V)Dr Michael Tan, michael@fke.utm.my
Next, Plotting in MATLAB
Monday, January 14, 2013
Dr Michael Tan, michael@fke.utm.my 7
Dr Michael Tan, michael@fke.utm.my
Import Data
Example 1.txt
Dr Michael Tan, michael@fke.utm.my
Import WizardSelect Tab
Dr Michael Tan, michael@fke.utm.my
Data loaded in Workspace
Now data appear in Workspace
Dr Michael Tan, michael@fke.utm.my
Saving Data as MAT FileSave data as MAT file
Monday, January 14, 2013
Dr Michael Tan, michael@fke.utm.my 8
Dr Michael Tan, michael@fke.utm.my
• Typesemilogy(Example1(:,1),Example1(:,2),'‐d')
Plot Command
Dr Michael Tan, michael@fke.utm.my
End Results in MATLAB
-10 -8 -6 -4 -2 0 2 4 6 8 1010
-12
10-11
10-10
10-9
10-8
10-7
10-6
10-5
10-4
Dr Michael Tan, michael@fke.utm.my
clc;clear all;close all;
load Example1.math1=semilogy(Example1(1:101,1),...
Example1(1:101,2),'--d');
M file normal plot
Dr Michael Tan, michael@fke.utm.my
M file normal plot
-10 -8 -6 -4 -2 0 2 4 6 8 1010-12
10-11
10-10
10-9
10-8
10-7
10-6
10-5
10-4
Monday, January 14, 2013
Dr Michael Tan, michael@fke.utm.my 9
Dr Michael Tan, michael@fke.utm.my
clc;clear all;close all; load Example1.mat f1=figure(1);h1=semilogy(Example1(1:101,1),Example1(1:101,2),'--d','Color',[0.5,0,0.5],'LineWidth',2, 'MarkerSize',5);set(gca,'Fontsize',14,'linewidth',3,'FontWeight', 'normal', 'FontName','Arial'); set(gca,'xlim',[-10 10]);set(gca,'ylim',[10E-13 10E-5]);set(gca,'XMinorTick','on','YMinorTick','on')
xlabel('Gate Voltage (V)','Fontsize',14);ylabel('Source Drain Current (A)','Fontsize',14);set(f1, 'color', 'white');
M file enhanced plot
Dr Michael Tan, michael@fke.utm.my
M file enhanced plot
-10 -8 -6 -4 -2 0 2 4 6 8 1010-12
10-11
10-10
10-9
10-8
10-7
10-6
10-5
10-4
Gate Voltage (V)
Sou
rce
Dra
in C
urre
nt (A
)
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