Changing Sensitivity of 'Imbinarize' using a slider

Question

Georg Edelmann 2020-2-28

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/508072-changing-sensitivity-of-imbinarize-using-a-slider

评论： Georg Edelmann 2020-3-3

Hey guys,

I´m binarizing Images using Matlab and try to figure out the right sensitivity value for each image. Therefore a slider would be quite useful.

How could this be done?

Here is my code so far.

clf()
I= imread('Bild_1.jpg');    %input
I=I(:,:,1);                 %Selecting a colour
I = imbinarize(I,'adaptive','ForegroundPolarity','dark','Sensitivity',sens); %turn grayscale image in binary image
                                                                    %sens is my variable 
imshow(I);
fig = uifigure();
fig.Position([3,4]) = [400,75];
sld = uislider(fig,'Position',[50,50,300,50],'Value',1,'Limits',[0,1],...
    'ValueChangedFcn', @(sld,event)changeSensitivityFcn(sld,event));
function changeSensitivityFcn(sld, event)
sens=sld.Value
drawnow()
end

I hope you can help me.

Greetings

Here is a related question i asked about the sliders

https://de.mathworks.com/matlabcentral/answers/471732-control-image-transparency-with-a-slider-appdesigner#answer_383287

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Answer 1

Divya Gaddipati 2020-3-3

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/508072-changing-sensitivity-of-imbinarize-using-a-slider#answer_418227

You can store the figure handle in a variable using uiaxes which can be passed to the changeSensitivity function to modify the binarization according to the changed sensitivity factor.

You can modify your code to something similar to as the following:

clc; clear; close all;
I= imread('peppers.png');    %input
I = I(:,:,1);                 %Selecting a colour
fig = uifigure;
cg = uiaxes(fig, 'Position', [50, 70, 500, 300]);
imshow(I, 'parent', cg);
sld = uislider(fig, 'Position', [100 50 300 50], 'Value', 1, 'Limits', [0,1],...
'ValueChangedFcn', @(sld, event)changeSensitivityFcn(event, cg, I));
function changeSensitivityFcn(event, cg, I)
    sens = event.Value;
    cg.Children.CData = im2uint8(imbinarize(I, 'adaptive', 'ForegroundPolarity', 'dark', ...
        'Sensitivity', sens)); 
    drawnow();
end