MATLAB: What is the function pixelIdxListsn

Image Processing Toolboxpixelidlistsn

Hello! I was given and asked to use a function called pixelIdxListsn, but because it was in .mexw64 file, and I am using a Mac so I had to get it in the .m format instead. I was told to get it from the Image Processing Toolbox, but realized that it actually does not belong there. Does anyone know where I can actually get the function, and what is it about? Thank you!

Best Answer

There is no such function in the Image Processing Toolbox as you know. To find alternate code that does the same thing I'd have to know what that function does. I would go back to the author of the .mexw64 file - whoever built/compiled it - and ask them for the source code.

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MATLAB: How to convert a script to a function

There may be other things wrong, but these 2 lines are surely not what you want. You pass in p and v as input arguments, then you just set them to empty here:

p = []; % Celestial body initial positions vector 
        % Will be N by 2 e.g. p1 = [px,py]
v = []; % Celestial body initial velocities vector
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It's not obvious what all the lines of code above this are all about either - they seem somewhat pointless.

You need to use the input arguments that you pass in - e.g. mass, not m as you do further down the code (or you could change your input argument name to 'm', but I much prefer 'mass' as it says what it is, 'm' is meaningless).

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MATLAB: How to calculate the area of different labels and remove the labels with smaller area?

CC is a struct including the field PixelIdxList. If you define the area as number of pixels, you just need the number of elements of each cell:

 elemsize=cellfun(@numel,CC.PixelIdxList);

To remove the small ones (I define "small" as "less than 100 pixels"):

 BW2=BW;
 BW2(vertcat((CC.PixelIdxList{cellfun(@numel,CC.PixelIdxList)<100})))=0;

You can of course do this without copying BW (just ignore the first line and use BW instead of BW2 in the second line).

Edit: If you also want to remove these from CC:

 CC.PixelIdxList(cellfun(@numel,CC.PixelIdxList)<100)=[];
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