How to convert jpg matrix to binary matrix

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Bence Salanki 2017-10-7

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回答： Walter Roberson 2017-10-10

Hi!

I would like to send an image with a LED, and to do that first I need to read the .jpg image with imread(), but here as a result I get a matrix with decimal elements. Later, for sending the image I will need only binary elements (1-LED is ON, 0-LED is OFF). I was thinking of using the dec2bin() conversion and the result I can store in a new matrix as a string (since it has more elements) and at the sending I just run through each string with a loop and turn the on/off depending on the 0/1 values, but the problem is that after the dec2bin() conversion I will get different sized strings and the receiver shouldn't know these sizes. Is there any other solutions for this problem?

Thank you so much.

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Answer 1

Star Strider 2017-10-7

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Try the im2bw or the imbinarize functions in the Image Processing Toolbox. See the documentation on them for necessary details.

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Bence Salanki 2017-10-7

编辑：Bence Salanki 2017-10-7

Thank you very much for your answer. The thing is that I don't want to loose the color information and the functions that you suggested are converting the image into black&white.

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Answer 2

Image Analyst 2017-10-8

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在 MATLAB Online 中打开

Here's one approach:

for k = 0 : 255 % Show what happens for every gray level.
  thisString = dec2bin(k);
  string8 = '00000000';
  string8(end-length(thisString)+1:end) = thisString
end

Now all the pixels will be 8 characters, with leading zeros if necessary.