How to convert multiple rgb snapshots into grayscale and save them into a folder?

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Omar Ahmad 2014-11-23

0
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https://ww2.mathworks.cn/matlabcentral/answers/163909-how-to-convert-multiple-rgb-snapshots-into-grayscale-and-save-them-into-a-folder

评论： Image Analyst 2014-11-29

I've taken multiple rgb snapshots and saved them into the folder using for-loop. But now I need to know how those snapshots can be converted into grayscale and save them into a folder.

After the above has been done, I need to know how both of these (rgb and gray) can be subtracted so that the difference is spotted.

Please help. thank you very much in advance.

采纳的回答

Image Analyst 2014-11-23

1
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https://ww2.mathworks.cn/matlabcentral/answers/163909-how-to-convert-multiple-rgb-snapshots-into-grayscale-and-save-them-into-a-folder#answer_159921

在 MATLAB Online 中打开

Try this:

grayImage = rgb2gray(rgbImage);
diffGray = double(grayImage) - double(grayReferenceImage);
diffRGB = double(rgbImage) - double(rgbReferenceImage);
if max(abs(diffGray(:))) > 0
    % There is at least one different pixel.
end

In the above coding, may I know what does variable a has to do with. I replaced it with rgbImage and I got it running smoothly. Please advice me If I have replaced with a correct one. And also the above coding perfectly writes the gray images into grayImage folder but fails to write the rgb images into its corresponding folder named rgbImage but another instead. (Matlab's default folder under Documents).

Somehow it writes both the image types onto disk.

thank you very much sir and May God Bless you for your in-depth knowledge and sharing personality. Factually, your way of answering is a bit too detailed and takes time for me to understand... but once understood it gives me a broad idea as to how things work.

I' am a newbie here for this Matlab answers tool and hence I happened to generate two similar questions. I shouldn't have done that. What I discovered was the answers provided to me by both questions were of a different style and I equally liked both. Because the one answered in the other question was short and your one was long and interesting as well. Therefore it took sometime to learn and implement your coding. And that's why it took little time to accept your answer. Thank you so much.

Omar Ahmad 2014-11-29

编辑：Omar Ahmad 2014-11-29

So to make the question short and simple. I want the result of diffGray converted into Binary and save it.By this I must be able to view in Black and White. Please help. This could be my last question. You (image analyst and Mohammed Abouali) helped me alot.

Image Analyst 2014-11-29

在 MATLAB Online 中打开

OK, you want to binarize the difference signal by thresholding it and turning it into a logical array. So you can do something like

binaryImage = diffRGB > someValue; % Like 2 or 5 or whatever

Pick a value that you want to see if the difference is greater than. Like if the difference between the images is more than 3 gray levels, show it, otherwise consider them the same with essentially no difference at all.

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