How to use improfile taking image from UIaxes in App designer

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Igor Grishin
Igor Grishin 2023-8-1
评论： Walter Roberson 2023-8-21
Hello!
I'm developing a windows application to demonstrate image profile as a program reaction to button click. Unfortunately I do not understand how I can use improfile function taking the image as a parameter from a UIAxes component of my application.
As I understand it must be really simple. I tried to pass the UIAxes as parameter, but it failes.
I will appreciate any guidance from Matlab community. Thank you in advance!
  1 个评论
Walter Roberson
Walter Roberson 2023-8-21
Have you used image() or imagesc() or imshow() to display an "image" to the UIAxis ? Or is it something else completely, such as a pcolor() or a patch or a histogram?

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Praveen Reddy
Praveen Reddy 2023-8-21
Hi Igor,
I understand that you want to pass image on the app designer UI axes as input to “improfile” function. Here is one way to do it in the call back function.
  • Read the image from app UI Axes using “getframe” function
  • Convert the image to grayscale
  • Define starting and ending coordinates for the profile.
  • Pass the grayscale image along with starting and ending coordinates as shown below.
function profileButtonPushed(app, event)
frame=getframe(app.UIAxes); %axes handle from which image has to be obtained
rgbImage = frame.cdata;
grayImage=rgb2gray(rgbImage);
x1 = 100; % starting x-coordinate
y1 = 100; % starting y-coordinate
x2 = 200; % ending x-coordinate
y2 = 200; % ending y-coordinate
profile = improfile(grayImage, [x1, x2], [y1, y2]);
plot(app.UIAxes2,profile);
end
Attaching an .mlapp file for reference where “improfile” function takes input from UI Axes.
Please refer to the following MATLAB documentations to know more about “improfile”, “getframe” functions.

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