MATLAB: Convert an Image to a binary (.bin) file

.binbinary fileconvert image to binary fileimageImage Processing Toolbox

Hello

I am trying to convert an image to a binary file (not binary image) for further processing in another software. I have tried the following code but does not seems to work as the file I am creating is zero bytes !

I= imread('cameraman.bin','w')
    fid=fopen ('cameraman.bin','w');
      fwrite(fid,I,'float32');

Can someone advice me on how to do this correctly ?

Thank you

Best Answer

As far as I know there is no defined format for .bin. It's like .raw - you can basically define it however you want. You need to find out what format that other software package wants.

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MATLAB: How to make .bin file

"I tried below code but it seems the binary file is not good". How do you define "good"?

Following code shows the image is saved and loaded properly.

img = imread('pears.png');
fid = fopen('test.bin', 'w+');
fwrite(fid, img, 'uint8');
fclose(fid);
fid = fopen('test.bin', 'r');
img_loaded = uint8(fread(fid, inf, 'uint8'));
fclose(fid);
img_loaded = reshape(img_loaded, size(img));
imshow(img_loaded);

MATLAB: Is it possible to create a sparse binary (.bin) file on disk

In case anyone comes across this question looking for the same thing...at some point in the last year I figured out a much better way to do this. Make a system call to

fallocate (Linux/UNIX - create or extend file)
fsutil file createnew (Windows - create file)
fsutil file seteof (Windows - extend file)
mkfile -n (MacOS - create file)

I haven't figured out extending a file on MacOS, but since this is a very unusual use case for me I have it setup to either zero-write to the end of the file or to read the data, delete, allocate a larger file, and re-write the data when a file of MacOS needs to be sparse-extended.

This is effectively instant, since it is true write-less allocation. For example, as a test I just allocated a 4 GB file in 0.05 seconds.

That said, writing non-sequentially to a file like this can be very slow, so you might be better off adding in zeros and writing data to the end of the file on the fly as needed, but write less allocation is possible to implement from within MATLAB.

Best Answer

Related Solutions

MATLAB: How to make .bin file

MATLAB: Is it possible to create a sparse binary (.bin) file on disk

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