Saving a Bilevel - or Binary Image

Question

Matthew Moynihan 2011-1-26

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https://ww2.mathworks.cn/matlabcentral/answers/451-saving-a-bilevel-or-binary-image

Hello,
     I am creating a black and white movie in my code.  I create a 4 dimensional matrix of zeros.  Each number in the matrix is a uint8.  This is the problem.
B = zeros(X, Y, 1, NumberOfFrames);
B = uint8(B);  
All I want to save is a 1 and a 0.  By doing a unit8 I add 7 extra bits to each pixel.  This is over a 25 minute mov file!! How can I save the information using less memory?  Is there for example an: 
   B = binary(B); 
Command?

Thanks!

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Answer 1

Sean de Wolski 2011-1-26

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B = false(X, Y, 1, NumberOfFrames); %casts as logical (1bit)

or

B = logical(B); %for something already in black and white but not 1bit

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Answer 2

Siddharth Shankar 2011-1-26

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在 MATLAB Online 中打开

B = zeros(X, Y, 1, NumberOfFrames);
B = logical(B);

is what you are looking for. More info here: Logical Types

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Matthew Moynihan 2011-1-27

Yes, I know, I used the Repmat function to duplicate the logical value.

Siddharth Shankar 2011-1-27

Sean, the code provided above is by no means meant to be "best practice" or the "best way" to do something. I was simply working off the code that "justthebasics" provided. The key was to make him aware of the LOGICAL function.

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