pdi aula de suporte a matlab

Tópicos Integradores (PDI) Suporte a MATLAB

Prof. João Marcelo M. da Silva

2015.2

Sumário

• Comandos (ginput, plot e save)

• Sistema de Janelas no MATLAB

• Deseja-se um programa que:

• adquira pontos da tela pelo mouse;

• mostre o local onde os pontos foram

adquiridos;

• salve estes pontos.

Objetivo

• Resultado esperado.

Resultado

• ginput – Graphical input from mouse.

• [x,y] = ginput(n) enables you to select n

points from the current axes and returns the x- and y-coordinates in the column vectors x and

y, respectively. Press the Return key to

terminate the input before entering n points.

Comando: ginput

• ginput – Graphical input from mouse.

• [x,y] = ginput gathers an unlimited

number of points until you press the Return

key.

• [x,y,button] = ginput(...) returns the

x-coordinates, the y-coordinates, and the button or key designation. button is a vector

of integers indicating which mouse buttons you

pressed (1 for left, 2 for middle, 3 for right), or

ASCII numbers indicating which keys on the

keyboard you pressed.

Comando: ginput

• Exemplo:

I = imread('eight.tif');

imshow(I);

[x,y] = ginput;

Comando: ginput

• plot – 2-D line plot.

• plot(Y) plots the columns of Y versus their

index.

• plot(X1,Y1,...) plots all lines defined by

Xn versus Yn pairs.

• plot(X1,Y1,LineSpec,...) plots all lines

defined by the Xn,Yn,LineSpec triples, where

LineSpec is a line specification that

determines line type, marker symbol, and color

of the plotted lines.

Comando: plot

• LineSpec – Line specification string syntax.

Comando: plot

Specifier Line Style - Solid line (default)

-- Dashed line : Dotted line -. Dash-dot line

Specifier Marker Type

+ Plus sign

o Circle

* Asterisk

. Point

x Cross

'square' or s Square

'diamond' or d Diamond

^ Upward-pointing triangle

v Downward-pointing triangle

> Right-pointing triangle

< Left-pointing triangle

'pentagram' or p Five-pointed star (pentagram)

'hexagram' or h Six-pointed star (hexagram)

Specifier Color r Red

g Green b Blue c Cyan

m Magenta y Yellow

k Black w White

• Exemplo: I = imread('eight.tif');

imshow(I);

[x,y] = ginput;

%exibição dos contornos

x(end+1)=x(1);

y(end+1)=y(1);

hold on

plot(x,y,'-b');

plot(x,y,'xr');

Comando: plot

• save filename stores all variables in the

current workspace in the file filename.

• save filename content options

stores only those variables specified by content in file filename, also applying

the specified options.

• Example: save 'pts_xy.txt' x y -ASCII;

save('pts_xy.txt','x','y','-ASCII');

Comando: save

• Format Options:

Comando: save

MAT-file format Options How Data Is Stored

-ascii Save data in 8-digit ASCII format.

-ascii -tabs Save data in 8-digit ASCII format delimited with tabs.

-ascii -double Save data in 16-digit ASCII format.

-ascii -double -tabs Save data in 16-digit ASCII format delimited with tabs.

-mat Binary MAT-file form (default).

• Exemplo:

clear, clc

disp('=========================')

disp('<-- PROGRAMA CONTORNO -->')

disp('========================='), disp(' ')

nome=input('Entre com o nome da imagem (ex:

eight.tif) --> ','s'); disp(' ')

I = imread(nome); imshow(I);

disp('Marque os pontos na imagem e para

finalizar, pressione a tecla "Esc" ...'),

disp(' ')

Comandos: ginput, plot e save

• Exemplo (continuação):

hold on, k=0; b=0;

while b~=27 %tecla “Esc”

k=k+1;

[x(k),y(k),b]=ginput(1);

if b~=27

plot(x(k),y(k),'+r');

end

end

x(k)=x(1); y(k)=y(1);

plot(x,y,'-b'), hold off;


• Exemplo (continuação):

x(k)=[]; y(k)=[];

pts_xy = 'pts_xy.txt';

save 'pts_xy.txt' x y -ASCII;

disp(['Pontos salvos em ' '"' pts_xy

'"']), disp(' ')

disp(' <-- FIM -->')

disp('=========================')


• Exercícios:

• Sabe-se que o centróide de um polígono é

calculado pelo valor médio das coordenadas.

Calcule o centróide dos polígonos gerados.

• Calcule o perímetro do polígono.


Sumário

• Comandos (ginput, plot e save)

• Sistema de Janelas no MATLAB

Programas com “Menu”

• Estrutura: Menu main_handle = figure('numbertitle','off','name','HistDoc','menubar','none');

imshow('hist_doc.jpg');

file = uimenu('label','File');

uimenu(file,'label','Open Image','callback','open_im','Accelerator','O');

uimenu(file,'label','Save Image','callback','save_im','Accelerator','S');

uimenu(file,'label','Save as','callback','save_as');

...

edit = uimenu('label','Edit');

uimenu(edit,'label','Undo/Redo','callback','undo_redo_im','Accelerator','Z');

...

transformation = uimenu('label','Transformation');

uimenu(transformation,'label','RGB to Gray','callback','rgb_gray');

...

help_histdoc = uimenu('label','Help');

uimenu(help_histdoc,'label','Help','callback','help_histdoc');

uimenu(help_histdoc,'label','About','callback','about_histdoc');


• Estrutura: Toolbar [icon1,map1] = imread('zoomicon.gif'); icon1 = ind2rgb(icon1,map1);

[icon2,map2] = imread('zoomouticon.gif'); icon2 = ind2rgb(icon2,map2);

[icon3,map3] = imread('panicon.gif'); icon3 = ind2rgb(icon3,map3);

[icon4,map4] = imread('openicon.gif'); icon4 = ind2rgb(icon4,map4);

[icon5,map5] = imread('saveicon.gif'); icon5 = ind2rgb(icon5,map5);

[icon6,map6] = imread('undoicon.gif'); icon6 = ind2rgb(icon6,map6);

TOOLbar = uitoolbar(main_handle);

uipushtool(TOOLbar,'CData',icon4,'TooltipString','Open','ClickedCallback','open_im');

uipushtool(TOOLbar,'CData',icon5,'TooltipString','Save','ClickedCallback','save_im');

...

clear icon1 icon2 icon3 icon4 icon5 icon6 map1 map2 map3 map4 map5 map6;


• open_im.m

Abrir Imagens

• open_im.m function open_im

[fname,pname] = uigetfile( ...

{'*.jpg;*.bmp','IMAGE Files (*.jpg,*.bmp)';

'*.jpg', 'JPEG (*.jpg)'; ...

'*.bmp','BMP (*.bmp)'; ...

'*.*', 'All Files (*.*)'}, ...

'Select an Image');

if size(fname,2)>1 && size(pname,2)>1

global main_handle

close(main_handle),HistDoc

global main_handle fname_in pname_in

fname_in = fname;

pname_in = pname;

global I I_AUX

I=imread([pname_in,fname_in]);

...

imshow(I), set(main_handle,'name',['HistDoc - ' fname_in]);

warning on all

end

Abrir Imagens

• save_as.m

Salvar Imagens

• save_as.m function save_as

global fname_in pname_in I main_handle

if prod(size(I))~=0

[fname, pname, filterindex] = uiputfile( ...

{'*.jpg;*.bmp','IMAGE Files (*.jpg,*.bmp)';

'*.jpg', 'JPEG (*.jpg)'; ...

'*.bmp','BMP (*.bmp)'; ...

'*.*', 'All Files (*.*)'}, ...

'Save as', fname_in);

if size(fname,2)>1 && size(pname,2)>1

imwrite(I,[pname,fname]);

fname_in = fname;

pname_in = pname;

set(main_handle,'name',['HistDoc - ' fname_in]);

end

end

Salvar Imagens

• rgb_gray.m

Converte: RGB – NC

• rgb_gray.m function rgb_gray

global I I_AUX

if prod(size(I))~=0

I_AUX = I;

I = rgb2gray(I);

hold on, imshow(I), hold off

end

Converte: RGB – NC

• help_histdoc.m

“Ajuda”

• help_histdoc.m function help_histdoc

help_string = sprintf(['We are sory, but the HistDoc\n' ...

'tool is under construction' ...

'.']);

help_box = 'HistDoc Tool - Help';

[A,Amap] = imread('histdoclogo.gif');

msgbox(help_string,help_box,'custom',A,Amap)

open('HistDoc.pdf');

“Ajuda”

Obs.: o exemplo foi feito com PDF, mas

também pode ser feito em HTML para

ser visualizado no browser do MATLAB

HELP.

• about_histdoc.m

“Sobre”

• about_histdoc.m function about_histdoc

help_string = sprintf(['HistDoc v1.0\n\n' ...

'HistDoc is a tool to process ' ...

'historical document images.\n\n' ...

'Developed by DA SILVA, J.M.M and LINS, R.D.\n' ...

'Copyright %c 2007'],169);

help_box = 'HistDoc Tool - About';

[A,Amap] = imread('histdoclogo.gif');

msgbox(help_string,help_box,'custom',A,Amap)

“Sobre”

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