How to convert image to binary text file?
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Hello, I have a 512x640 16 bit image. It is in uint16 format. It doesn't have color information (RGB). I want convert each pixel's value to binary and write it to a text file. I've tried some codes but it didn't work. How can i do it? Lets assume my image is 4 bit and the .txt file contains should seem like this:
0010
1100
0100
.
.
1000
回答（1 个）
The error is probably because you don't have write permissions to whatever directory you're trying to write to. You'll have to figure out why that is.
I assume you want to write the output as 16 bit, and that you weren't actually suggesting to convert it to 4-bit.
% a uint16 array
A = im2uint16(imread('cameraman.tif'));
% you should probably explicitly specify the field width.
% otherwise, the width will vary depending on the maximum values in A.
binStr = dec2bin(A,16);
% if whatever reads the file can handle variable-length fields,
% then you could save filesize by omitting the field width specification.
%binStr = dec2bin(A);
% write one word per line
% the expression length given to fprintf() needs to correspond
% to the actual field width, since it's not necessarily 16 characters!
% if the two mismatch, binary words will be split across lines
% and the result will be a jumbled mess.
fname = 'test_binary.txt';
fid = fopen(fname,'w');
expr = [repmat('%c',[1 size(binStr,2)]) '\n'];
fprintf(fid,expr,binStr.');
fclose(fid);
I'm not sure why you're storing image data this way, but bear in mind that you're going to create giant files. Even writing raw uncompressed binary data is much more compact.
% this is 8x as large as an uncompressed PGM
% and 18x as large as a lossless PNG
S = dir(fname); S.bytes
imwrite(A,'test.pgm')
S = dir('test.pgm'); S.bytes
imwrite(A,'test.png')
S = dir('test.png'); S.bytes
2 个评论
Fatih
2023-11-26
FWIW, formats like PGM are very simple binary data with a short header. There really isn't any decoding to do. Depending on the effort-memory tradeoff, you might consider using PGM or even a headerless raw binary file. It would be significantly smaller than text, if that's of any concern (assuming you have the option of changing how the embedded code accepts inputs).
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