What does a colon followed by comma do to an image?

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Recap 2016-3-9

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/272382-what-does-a-colon-followed-by-comma-do-to-an-image

评论： Recap 2016-3-14

采纳的回答： Adam

在 MATLAB Online 中打开

I don't quite understand what the following code is doing.

numFolder=fullfile('NumberZero/','Zero/');
for i=1:10;
    numName=sprintf('%d.bmp',i);
    image1=imread([numFolder, numName]);
    im1(:,:,i)=image1; % what is this line doing?
end

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Adam 2016-3-9

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https://ww2.mathworks.cn/matlabcentral/answers/272382-what-does-a-colon-followed-by-comma-do-to-an-image#answer_212975

编辑：Adam 2016-3-9

在 MATLAB Online 中打开

im1(:,:,i)

means take all elements of your 3d array in the first and 2nd dimensions and only the i'th value in the 3rd dimension.

So basically it turns your data from 3d to 2d in this case by extracting just one slice from the 3rd dimension of a volume.

doc colon

The comma is just the standard syntax for separating the dimensions of your matrix which is why in your case I could easily see that im1 is 3d.

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Adam 2016-3-14

I'm not really familiar with neural networks so I'm not sure I would be able to help with that.

Recap 2016-3-14

The code is there and general comments of what its doing. except that i dont get what its exactly the algorithms are doing because im not familiar with matlab syntax. You can have a look at it from my dropbox if your interested.

https://www.dropbox.com/s/gg0fnxewv72od17/NeuroTrainingNumbers.m?dl=0

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