using image in gui

hello I'm new to matlab I hope you can help me

I'm making program in gui that can import image

so i wrote this code

 [filename, pathname] = uigetfile('*.png');
 layout=imread(filename); 
 imshow(layout);

and when i press button I want to open the image in new window with a grid on it

how can i do this

your help will be appreciated

Answer 1

[Geoff Hayes]

Shaimaa - presumably your code (from above) will be placed in the callback function to a pushbutton on your GUI that has been created with GUIDE. If your pushbutton is named (or its Tag property is set to) pushbutton1, then the callback would look like

 function pushbutton1_Callback(hObject, eventdata, handles)

 % let the user choose the file
 [filename, pathname] = uigetfile('*.png');

Now once the file has been picked, you want to read it (as you have shown) with imread. But you will have to include the path to the file and not just the file name. Use the function fullfile to "build" the path with file name for you

 layout=imread(fullfile(pathname,filename)); 
 imshow(layout);

The above should display the image in a new figure. If you want the grid lines to display, then use grid as

 grid on;

These four lines of code will make up the body of your callback. Try the above and see what happens!

[Image Analyst]

I prefer "axis on" rather than grid on because it doesn't put up anything over the image but just puts tick marks on the outer edges of the image. But I much prefer using a listbox to display the images rather than forcing the user to browse for one. Why not just list all the image names all the time and let the user click on one in a listbox to display it automatically? It's a very much nicer experience for the user. See MAGIC for a nice framework for beginners.

[shaimaa almadani]

thanks it worked , but I want the user to put the length and width then the grid split based on some equations

I wrote this code which is not working above image

it works only in empty axis

so please help

prompt={'plese insert the value of length(cm)= '}; title='Set Grid'; answer=inputdlg(prompt,title); lengthMod= str2double(answer);

prompt={'plese insert the value of width (cm)= '};
title='Set Grid';
answer=inputdlg(prompt,title);
widthMod= str2double(answer);

 % the cell width is constant 
 CellWidht=50;
 % cal the number of rows 
 NumRows=widthMod/CellWidht;

 % cal the number of coul
 NumCol=lengthMod/CellWidht;
 % cal the number of cell
 NumCell=NumRows*NumCol;

x = linspace(1,10,sqrt(NumCell)+1); y = linspace(1,10,sqrt(NumCell)+1);

% Horizontal grid for k = 1:length(y) line([x(1) x(end)], [y(k) y(k)])

end

% Vertical grid for k = 1:length(y) line([x(k) x(k)], [y(1) y(end)]) end

[Image Analyst]

No, don't do that. Simply specify the limits of the x and y axes with the 'xdata' and 'ydata' input options of imshow(). Look it up in the help.

[shaimaa almadani]

sorry i didn't get it example please

[Geoff Hayes]

See the Name-Value Pair Arguments section of imshow.

[shaimaa almadani]

and how can the user choose the value of length and width

Answer 2

[Image Analyst]

If you want your tick marks to read from 0 to 4 cm horizontally and 0 to 3, then do this:

rgbImage = imread('onion.png');
imshow(rgbImage, 'Xdata',[0 4], 'Ydata', [0, 3]);
axis on;

Otherwise the tick marks will read out in units of pixels.

[shaimaa almadani]

thank you thank you thank you it works

[Image Analyst]

You're welcome. Note though that this just affects the display. If you make any measurements with regionprops, such as area, the values are still in pixels. Can you mark the answer as "Accepted" then? Thanks in advance.

[shaimaa almadani]

what about if i want to take the length and width from the user