GUI Design Matlab Report

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EC 247 COMPUTING FOR ENGINEERS

ASSIGNMENT 1

GRAPHICAL USER INTERFACE DESIGN

LECTURERS IN-CHARGE MS. LAKMINI MALASINGHE /MS. SWAPNA PREMASIRI

Submitted By:EN 14535468 Kau!a"#a S$A$D$T$P

On 4thof September 2015


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Abstract


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This report describes the working process of a MATLAB-based GUI which is useful for image

processing and image qualit assessment!This Image "rocessing Application helps user to easil modif

images# the Image $ualit Ad%ustment Application enables to create series of pictures with different

qualit! Image processing is one of the most important area of multimedia applications and it is known#

these applications can be found almost e&erwhere in the modern world! Because of that# the number of

people working with images is rapidl increasing which means# that demand for image processing toolsalso grows!The Image "rocessing Application helps user to easil modif images!

Table of Contents


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Table of figures


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Introduction


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In imaging science# image processing is processing of images using mathematical operations b using

an form of signal processing for which the input is an image# such as a photograph or &ideo frame' the

output of image processing ma be either an image or a set of characteristics or parameters related to the

image! In modern sciences and technologies# images also gain much broader scopes due to the e&er

growing importance of scientific &isuali(ation )*+

MATLAB is built around a programming language# and as such it,s reall designed with tool-building in

mind! Guide etends MATLAB,s support for rapid coding into the realm of building GUIs! Guide is a

set of MATLAB tools designed to make building GUIs easier and faster! .ust as writing math in

MATLAB is much like writing it on paper# building a GUI with Guide is much like drawing one on

paper! As a result# ou can la out a comple graphical tool in minutes! /nce our buttons and plots are

in place# the Guide 0allback 1ditor lets ou set up the MATLAB code that gets eecuted when a

particular button is pressed!

GUI21 is MATLAB,s Graphical User Interface 3GUI4 2e&elopment 1n&ironment! A graphical user

interface 3GUI4 is a user interface built with graphical ob%ects# such as buttons# tet fields# sliders# and

menus! In general# these ob%ects alread ha&e meanings to most computer users!The Image "rocessing

Application helps user to easil modif images# the Image $ualit Ad%ustment Application enables to

create series of pictures with different qualit! Applications that pro&ide GUIs are generall easier to

learn and use since the person using the application does not need to know what commands are a&ailable

or how the work! The action that results from a particular user action can be made clear b the design

of the interface!

Image processing is one of the most important area of multimedia applications and it is known# these

applications can be found almost e&erwhere in the modern world! Because of that# the number of

people working with images is rapidl increasing which means# that demand for image processing tools

also grows! Images are being compressed# decompressed# sent o&er the internet# modified or distorted in

&arious was and all these things affect their qualit! It is the ke element for multimedia to be able to

assess the qualit changes# predict them and e&entuall correct them! The best wa of qualit assessment

is sub%ecti&e testing b a group of human obser&ers but it is time-consuming and costl# the conditions

of measurement must be precise and obser&ers must be well instructed! )5+

Design Objectives


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Designingthe GUI

Laying outthe GUI

Programming the GUI

Saingan!

Runningthe GUI

Main purpose of this assignment is to designing a Matlab GUI to load an image and perform &arious

image pre-processing operations! "ro%ect ob%ecti&es can be subdi&ided in to following!

Application of se&eral methods to anal(e and impro&e digital images!

Anal(e the effect of each method when it is applied on to an image!

0ompare and contrast methods according to the qualit of the final image obtained! Anal(ing further impro&ements that can be made to impro&e the image qualit!

Design Process

MATLAB implements GUIs as figure windows containing &arious stles of uicontrol ob%ects! 6ou must

program each ob%ect to perform the intended action when acti&ated b the user of the GUI! In addition#

ou must be able to sa&e graphical user interface de&elopment en&ironment! The process of

implementing a GUI in&ol&es two basic tasks )7+

Laing out the GUI components

"rogramming the GUI component!

Tpical stages of creating image processing GUI can be epressed as follows!

GUI Structure

Figure 1: GUI Design P


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User In"ut#"tions

$uttonPress

#"tion

%omman!Entering#"tion

S&i!er $ar

In'$ui&t(un)tions

mage (i&ters $rightness %o&orings We*)am #rientations

Figure 2: Design structure

Design Functions

GUI Implementation

8hile it is possible to write an M-file that contains all the commands to la

out a GUI# it is easier to use GUI21 to la out the components

interacti&el and to generate two files that sa&e and launch the GUI namel

Rotate

(&i"

Hori+ont (&i" ,ert

$&a)-

White Grays)a&e

Negatie

(i&ters

E!ges

%ontrast

Re!

Green

$&ue


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9IG-file

0ontains a complete description of the GUI figure and all of its children 3uicontrols and aes4#

as well as the &alues of all ob%ect properties!

M-file

0ontains the functions that launch and control the GUI and the callbacks# which are defined assub functions! This M-file is referred to as the application M-file in this documentation! It is

important to note that the application M-file does not contain the code that las out the

uicontrols' this information is sa&ed in the 9IG-file!

The following diagram illustrates the parts of a GUI implementation!

Figure 3: GUI layout


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Uicontrols

"ush buttons

:adio buttons

0heckboes

UI editable tet

UI static tet

;liders

9rames

List boes

"op-up menus

Callbac !ditor

0allback 1ditor lets user modif the callbacks of selected ob%ects! User can change multiple lines of

code at once using the 1dit Bo! The 1dit Bo also makes it easier to enter


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In this section# we suggest a road map adopted for creating GUI in MATLAB! Like e&erthing

associated with design# this reall amounts to some suggestions about how to think# rather than a step-

b-step recipe! It,s helpful to think about the GUI creation process as breaking into a design phase and

an implementation phase! This concept is illustrated in the diagram below! )=+

Design Goals

;implicit

;implicit in this design is our chief goal! This GUI has a clean look and a sense of unit! It,s &er eas

to add functionalit to the GUI but if that functionalit reall doesn,t belong# take it out! This design

a&oid screen clutter# and onl present users with choices that ad&ance them toward the completion of the

task!

0onsistenc

The further users are from their base of eperience# the more likel the are to feel disoriented! Anthing

ou one can do to keep the user from feeling confused is etraordinaril important!

9amiliarit

This GUI that created is in some sense familiar to its users# then the user can generall learn how to use

it more quickl! User,s real world eperience can bridge the gap between the onscreen eperience and

the data it represents!

Figure 5: DesignPhase


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Final Design

Figure 6: Final GUI layout

Figure 7: GUI interace once !un


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Design Functions

"o# to $oad an image on to A%es

In this design user can simpl load whate&er the image he want to edit using the L/A2 pushbutton!/nce it is pressed it automaticall goes to windows file browser to select image from the file browser of

the computer!

If the user clicks cancels without selecting an image properl# it will print 1rror! /therwise the selected

image will load on to the aes *! "ath name of the image will be displaed automaticall!

Color Filters

In this function user has the capabilit change the color of the image which has loaded on to the aes!

This GUI basicall supports 7 color filters namel :ed Green > Blue! 7 separate buttons are a&ailable

for the user to select whate&er the color filter he wish! 0orresponding filtered image will then be loaded

on to the aes 5 of the GUI!

Figure ": !esults i user cancels

Figure # $oa% &utton

Figure 1': Final !esults o $oa% option


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Orientation Options

;et of buttons are a&ailable for the user tochange the orientation of the image he has loaded on to the aes *! This GUI supports basicall 7 main

orientation &ariations! ?amel 9lip &ertical #9lip


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Figure 13: +rientation &uttons

Image !ffects

This GUI basicall supports @ main effects which can be applied on to the image which has been

selected on to the aes *! 0orresponding edited image will be displaed on the aes 5! User has to insert

a command b clicking on the corresponding push button! Image effects a&ailable for this GUI 2esign

are Black > 8hite# Grascale# ?egati&e# 9ilters# 1dges# 0ontrast! In edges option# this GUI uses

0ann, method of edge detection!

Figure 14 : ,ori-ontal Flip

Figure 15: .s/ing user input in

Figure 16: !otate the image )y an angle o 12'0


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Ot&er Options

:eset 0ommand will undo all the effects which has been brought about to the image in aes 5 itwill simpl shows the original image which is simpl loaded on to the GUI intiall b the user!

1it command will shutdown and close the ongoing GUI without sa&ing anthing

;a&e option enables the user to sa&e edited image on aes 5 on to the computer! /nce it is

pressed it asks the user to gi&e a image name and the file folder loaction which needs to be sa&ed

at!


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'rig&tness

In this GUI a slider has been used to change the brightness le&el! B dragging the slider user can change

the brightness le&el as he desired!

Command !ntering Option

/ne of the basic features a&ailable on this GUI design is 0ommand 1ntering option! It gi&es the abilit

of entering the command on the edit tet bo and eecute rather than pressing the switch buttons! ?ow

the user has the abilit tpe the command and press eecute button to run whate&er the imageprocessing! GUI design takes the inputs as a string and eecute the command as switch statements!

User has the capabilit to change the switch statements using the callback function!

Figure 17: ae imageoutput

Figure 1": (omman% ntering


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Call bac Functions

UI and graphics components ha&e certain properties that one can associate with specific callback

functions! 1ach of these properties corresponds to a specific user action! 1ach uicontrol has a propert

called 0allback! User can set the &alue of this propert to be a handle to a callback function# an

anonmous function# or a string containing MATLABcommands! ;etting this propert makes UI

respond when the user interacts with the uicontrol! If the 0allback propert has no specified &alue# then

nothing happens when the end user interacts with the uicontrol! )C+

0oding the beha&ior of a UI component in&ol&es specific tasks that are unique to the tpe of component

ou are working with! This section of the report contains callbacks for each tpe of components we ha&e

used in image processing!


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To $oad an image on to A%es

To save t&e edited image

To reset t&e edited image

Call bacs on image effects


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Call bacs on Image Orientations


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Call bacs on 'rig&tness Slider

Call bacs on color filters


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Call bacs on triggering t&e (ebcam

Conclusions


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MATLAB is well known for its numerical problem sol&ing power! Traditionall programs written b

engineers ha&e &er simple interfaces# and often onl the author is the one who uses the program once it

is completed! There are occasions where a more polished user interface# specificall a graphical user

interface 3GUI4 is desired! The main purpose of this assignment is to build a GUI for image processing!

The Image "rocessing Application helps user to easil modif images# the Image $ualit Ad%ustment

Application enables to create series of pictures with different qualit! Applications that pro&ide GUIs aregenerall easier to learn and use since the person using the application does not need to know what

commands are a&ailable or how the work!

Main functions a&ailable on the GUI designed were broadl discussed in this report! 9inall I can

conclude that this Image "rocessing GUI gi&es a new eperience for the user! Most of the functions used

here are adopted in a user-friendl manner! As final recommendations# it is suggested that this GUI

2esign can be further de&eloped b adding more functions! :eaction time for the button eecutions can

be further brought down b using smart and efficient coding in the callbacks!

)eferences

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1

htt"s2//en.3i-i"e!ia.org/3i-i/Image4"ro)essing5 6Image "ro)essing6.

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M. K. E. R. E. 8. Lu-9: KRASULA5 6MA;LA$'*ase! A""&i)ations


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GUI Design Matlab Report

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