How to convert image (bmp,jpg....) to .bin file ?

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dao 2014-10-15

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https://ww2.mathworks.cn/matlabcentral/answers/158666-how-to-convert-image-bmp-jpg-to-bin-file

评论： Geoff Hayes 2014-10-16

I have a colour image and I want convert it to binary such as .bin (without losing color). In C code, I can easly use 'fopen' but it can't work in matlab. Anybody help me please.

Sorry my E is not good.

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dao 2014-10-16

编辑：dao 2014-10-16

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Thank Geoff Hayes for your help, But how can I read this bin ? I use

    fid = fopen('myBin.bin', 'r');
    R = fread(r,[626 1124 3],'uint8');
    imshow(R)

but fread function doesn't receive Three-dimensional matrix. So how can I convert this .bin file to image ?

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Answer 1

Geoff Hayes 2014-10-15

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https://ww2.mathworks.cn/matlabcentral/answers/158666-how-to-convert-image-bmp-jpg-to-bin-file#answer_155258

在 MATLAB Online 中打开

dao - if you have read the image from file (as a bmp or jpg) using imread, then you can use fopen and fwrite to write the data to a binary file. For example,

 % read the image from file
 myImage = imread('someImage.jpg');
 % open a file to write to
 fid     = fopen('myBin.bin','w+');
 if fid>0
     % write the data to file
     fwrite(fid,myImage,'uint8');
     % close the file
     fclose(fid);
 end

In the above, we read in some image and open a file for writing (using w+ to indicate that we wish to open or create a new file for writing). It is assumed that the data type for the image is uint8 so we use that in our precision field of the fwrite function.

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dao 2014-10-16

Thank for your help. Can you explain more to me about 'uint8=>uint8' ? I still don't get it

Geoff Hayes 2014-10-16

From fread precision, the left hand side of the => is the source, and the right hand side is the output. So 'uint8=>uint8' means that for every 8 bit unsigned integer that we read in, we save this value as an 8-bit unsigned integer in our R (output) matrix. I did this because without it, R would be a matrix of data type double, since the default precision is 'uint8=>double'.

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