Intensity Profile of a specific line

Question

Omor Khan 2021-10-24

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1570368-intensity-profile-of-a-specific-line

编辑： Matt J 2021-11-8

Hello,

I want to build an app that lets the user upload an image then draw a line on that image. Then with a press of a button an intensity profile of the specified line will show up next to it.

I'm able to uplad an image but I'm stuck on how to draw a line on top of the image, then just save the location and then intensity afterwards.

Here is a thread of basically what I want to do: https://www.mathworks.com/matlabcentral/answers/389889-how-to-plot-intensity-profile-of-an-image?s_tid=srchtitle

Here's what I have so far:

classdef Intensity_Analysis < matlab.apps.AppBase
    % Properties that correspond to app components
    properties (Access = public)
        UIFigure      matlab.ui.Figure
        PlotButton    matlab.ui.control.Button
        UploadButton  matlab.ui.control.Button
        UIAxes2       matlab.ui.control.UIAxes
        UIAxes        matlab.ui.control.UIAxes
    end
    % Callbacks that handle component events
    methods (Access = private)
        % Button pushed function: UploadButton
        function UploadButtonPushed(app, event)
            global a;
            [filename, pathname] = uigetfile('*.*', 'Pick an Image');
            filename = strcat(pathname,filename);
            a = imread(filename);
            imshow(a,'Parent',app.UIAxes);
        end
    end
    % Component initialization
    methods (Access = private)
        % Create UIFigure and components
        function createComponents(app)
            % Create UIFigure and hide until all components are created
            app.UIFigure = uifigure('Visible', 'off');
            app.UIFigure.Position = [100 100 640 480];
            app.UIFigure.Name = 'MATLAB App';
            % Create UIAxes
            app.UIAxes = uiaxes(app.UIFigure);
            title(app.UIAxes, 'Original Image')
            zlabel(app.UIAxes, 'Z')
            app.UIAxes.Position = [15 173 300 185];
            % Create UIAxes2
            app.UIAxes2 = uiaxes(app.UIFigure);
            title(app.UIAxes2, 'Intensity')
            zlabel(app.UIAxes2, 'Z')
            app.UIAxes2.Position = [314 173 300 185];
            % Create UploadButton
            app.UploadButton = uibutton(app.UIFigure, 'push');
            app.UploadButton.ButtonPushedFcn = createCallbackFcn(app, @UploadButtonPushed, true);
            app.UploadButton.Position = [115 134 100 22];
            app.UploadButton.Text = 'Upload';
            % Create PlotButton
            app.PlotButton = uibutton(app.UIFigure, 'push');
            app.PlotButton.Position = [414 134 100 22];
            app.PlotButton.Text = 'Plot';
            % Show the figure after all components are created
            app.UIFigure.Visible = 'on';
        end
    end
    % App creation and deletion
    methods (Access = public)
        % Construct app
        function app = Intensity_Analysis
            % Create UIFigure and components
            createComponents(app)
            % Register the app with App Designer
            registerApp(app, app.UIFigure)
            if nargout == 0
                clear app
            end
        end
        % Code that executes before app deletion
        function delete(app)
            % Delete UIFigure when app is deleted
            delete(app.UIFigure)
        end
    end
end

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Answer 1

Matt J 2021-10-24

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1570368-intensity-profile-of-a-specific-line#answer_815213

You could just use improfile()

https://www.mathworks.com/help/images/ref/improfile.html

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Omor Khan 2021-10-24

在 MATLAB Online 中打开

Hello Matt,

Thank you for the help. Yes, I do want to use improfile to get the intensity of the image but I want to get the intensity of a specific line/drawing from the user. I found that I can use imfreehand or drawfreehand to have the user draw a line and also see methods that I can store the position in a variable. The issue I'm having is with this current code it won't draw on the image

Updated code below:

% Button pushed function: UploadButton
        function UploadButtonPushed(app, event)
            global a hfH;
            [filename, pathname] = uigetfile('*.*', 'Pick an Image');
            filename = strcat(pathname,filename);
            a = imread(filename);
            imshow(a,'Parent',app.UIAxes);
            hfH = imfreehand();
        end
        % Button pushed function: DrawButton
        function DrawButtonPushed(app, event)
            global x y a hFH;
            binaryImage = hFH.createMask();
            xy = hfH.getPosition;
            structBoundaries = bwboundaries(binaryImage);
            xy=structBoundaries{1}; % Get n by 2 array of x,y coordinates.
            x = xy(:, 2); % Columns.
            y = xy(:, 1); % Rows.
        end

Omor Khan 2021-11-8

@Matt J would you mind showing me a demo of what you mean? I don't think I understand it and how to implement it. Thank you!

Matt J 2021-11-8

编辑：Matt J 2021-11-8

I can't demo it because it is interactive. Just issue the command improfile() at the command line or in a function, while an image axis is current. Then start drawing the profile line on the image.

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