Download pdf - 3 Digitizing

Monday, January 14, 2013

Dr Michael Tan, [email protected] 1

DIGITIZINGUniversiti Teknologi MalaysiaDr Michael Tan Loong PengPhD (Cambridge)Senior LecturerFaculty of Electrical EngineeringUniversiti Teknologi Malaysia

Dr Michael Tan, [email protected]

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.


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.



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





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.


Identify Figure from Paper


Print Screen


Open Replica




Load Image From File


Open Image


Insert Full Box


Fit the box into Axis




Dimensions


Start Digitizing


Export Data


Save Data to File




Open data file using Excel


Text Import Wizard


Choose Tab and Space


Select General




Data exported in Excel


Plot using XY (Scatter)

Select Scatter with Smooth Lines and Markers


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, [email protected]

Next, Plotting in MATLAB




Import Data

Example 1.txt


Import WizardSelect Tab


Data loaded in Workspace

Now data appear in Workspace


Saving Data as MAT FileSave data as MAT file




• Typesemilogy(Example1(:,1),Example1(:,2),'‐d')

Plot Command


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


clc;clear all;close all;

load Example1.math1=semilogy(Example1(1:101,1),...

Example1(1:101,2),'--d');

M file normal plot


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




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


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

)