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Matlab- Improve code in image cropping black border

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问题 I have this code that crop the black borders in my picture. I don't know why the border still exists. I1=im2double(imread('dart.jpg')); sizeI = size(I1); zeros = floor((sizeI(2) - min(sum(any(I1))))/2); I2 = I1(:, zeros : sizeI(2)-zeros, :); nonZero = sum(any(I1,2)); sizeI2 = size(I2); zerosRows = floor((sizeI(1) - min(sum(any(I2, 2))))/2); I3 = I2(zerosRows : sizeI2(1)-zerosRows, :, :); subplot(1,3,1), imshow(I1);title('Figure 1'); subplot(1,3,2), imshow(I2);title('Figure 2'); subplot(1,3,3)

In MATLAB, how can you have a callback execute while a slider is being dragged?

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问题 I have created a MATLAB GUI using GUIDE. I have a slider with a callback function. I have noticed that this callback, which is supposed to execute 'on slider movement', in fact only runs once the slider has been moved and the mouse released. Is there a way to get a script to run as the slider is being dragged, for live updating of a plot? There would I presume need to be something to stop the script being run too many times. 回答1: Even though the callback of the slider isn't being called as

Stop A GUI in a middle of process in MATLAB

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问题 I'm designing a GUI using GUIDE in MATLAB R2014b. My program has a long loop (takes 2~5h to process). I want have a button in my GUI that the user stop the process every time he/she want (The GUI is updating graphs and texts continuously based on result of loops). Something like pressing Control+C not after ending a loop. How can I implement this? PS. I don't want MATLAB remove my workspace. The user can continue the process with previous loaded data and workspace by changing some options in

What's the “right” way to organize GUI code?

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问题 I'm working on a fairly sophisticated GUI program to be deployed with MATLAB Compiler. (There are good reasons MATLAB is being used to build this GUI, that is not the point of this question. I realize GUI-building is not a strong suit for this language.) There are quite a few ways to share data between functions in a GUI, or even pass data between GUIs within an application: setappdata/getappdata/_____appdata - associate arbitrary data to a handle guidata - typically used with GUIDE; "store[s

How should I update the data of a plot in Matlab?

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Suppose that I want to update a plot with a new data. What method should I choose? Set the XDataSource property to some name, update the variable, and call refreshdata Erase the original plot , and call plot command again. Use Set('Xdata',...') Andrey Rubshtein Short answer : always use Set('Xdata',...') . Example code: function PlotUpdate() x = 0:.1:8; y = sin(x); h = plot(x,y); y = sin(x.^3); set(h,'XData',x,'YData',y); end Long answer: There are three relevant measures by which one should choose the best method. Code clarity - How easy it is for someone to read your code? Runtime - How

How can I program a GUI in MATLAB? [closed]

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问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 6 years ago . I need to create a GUI in MATLAB for my project. I looked everywhere for examples of how to program a GUI but I couldn\'t find a lot. What are some good sites or techniques for GUI programming in MATLAB? 回答1: The first place you need to go is Matlab Help on Creating Graphical User Interfaces . Then, you can

How should I update the data of a plot in Matlab?

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问题 Suppose that I want to update a plot with a new data. What method should I choose? Set the XDataSource property to some name, update the variable, and call refreshdata Erase the original plot , and call plot command again. Use Set(\'Xdata\',...\') 回答1: Short answer : always use Set('Xdata',...') . Example code: function PlotUpdate() x = 0:.1:8; y = sin(x); h = plot(x,y); y = sin(x.^3); set(h,'XData',x,'YData',y); end Long answer: There are three relevant measures by which one should choose

How to put these images together?

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问题 I have 200 time points. For each time point, there is an image, the size of which is 40*40 double , corresponds to this time point. For example, image 1 corresponds to time point 1 ; image k corresponds to time point k ( k = 1,2,...,200 ). The time points are T = 1:200 , with the images named as Image_T , thus Image_1 , Image_2 etc. I want to put all these 200 images together. The final size is 40*40*200 double. The final image looks like fMRI image ( fmri_szX = 40 , fmri_szY = 40 and fmri