How to open .raw files in matlab?

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Pooja 2013-4-18

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评论： zinah n 2019-9-24

采纳的回答： Jan

Hello,

How will I open my .raw files in matlab?

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Jan 2013-4-21

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https://ww2.mathworks.cn/matlabcentral/answers/72525-how-to-open-raw-files-in-matlab#answer_83002

在 MATLAB Online 中打开

Even after the large number of questions for clarifications and a lot of comments, the actual problem does not get clearer. It seems, like our messages do no reach you, Pooja:

 It is your turn to find out the details of the format.
 We cannot help you, when we have to guess, what you need.

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Image Analyst 2013-4-24

在 MATLAB Online 中打开

Pooja: Just replace the header with some known values, like

BytesPerPixel  = 1; % Let's assume we're using 8 bit images.
% BytesPerPixel  = 2; % Use 2 if you know you have 16 bit images.
x_size = 320; % You need to figure this number out - we don't know it.
y_size = 240; % You need to figure this number out - we don't know it.
if BytesPerPixel  == 1
    yourImage = fread(fid, [x_size y_size], '*uint8');
elseif BytesPerPixel  == 2
    yourImage = fread(fid, [x_size y_size], '*int16'); 
else
    error('Unsupported BytesPerPixel  %d', BytesPerPixel  );
end
% yourImage will be a 2D array after this 
% with x_size columns and y_size rows.

And I also changed the name of fileHandle to fid (what you used) since you didn't seem to know to do that. But again, like we've all been telling you over several messages, you need to figure out, or guess, on the number of rows (y_size) and number of columns (x_size). If you guess, you might get something that looks almost normal but skewed (sheared). Then you can just keep guessing until it looks right. Or better yet, just ask the person who created your image.

Pooja 2013-4-25

在 MATLAB Online 中打开

Thank you so much.Got the o/p

if true
  % row=1024;  col=1024;
fin=fopen('b1.raw','r');
I=fread(fin,row*col,'uint8=>uint8'); 
Z=reshape(I,row,col);
Z=Z';
k=imshow(Z)
end

Walter Roberson 2013-4-25

If the question is finished please Accept one of the Answers.

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Image Analyst 2013-4-18

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Pooja, do you have any idea at all ...

what the lateral size of the image is (number of rows and columns), and
whether it's grayscale, RGB color or multispectral,
if color how the red, green, and blue values are positioned (interleaved)
how many bits (8 or 16 are typical) is the pixel written out
if there is a header and how long it might be?

Or are you willing to guess at some typical values? You can pass in an array to the fread() function to get back a 2D array.

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Pooja 2013-4-21

sorry, instead of stHeader.BytesPerVoxel == 1 what should i give?

fid = fopen('mars.raw');

rawdata = fread(fid, inf, '*uint8');

fclose(fid);

stHeader.BytesPerVoxel is an undefined function.

Image Analyst 2013-4-21

As you can see from the '*uint8' or '*uint16' in the fread() statement, it's either 1 or 2, for 8 bit (one byte) or 16 bit (2 bytes) respectively. x_size will be the number of columns, and y_size is the number of rows that you want in your 2D array (which I called oneSlice but you can call rawdata if you want).

Now, notice how your fread() doesn't look like mine because you didn't put in the desired output matrix size ([x_size y_size]) like I did. Why not?

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Walter Roberson 2013-4-18

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There are different .raw file formats, different ones for different manufacturers.

http://blogs.mathworks.com/steve/2011/03/08/tips-for-reading-a-camera-raw-file-into-matlab/

http://www.mathworks.com/matlabcentral/fileexchange/23394-fast-import-of-compressed-binary-raw-files-created-with-ltspice-circuit-simulator

http://www.mathworks.com/matlabcentral/fileexchange/29344-read-medical-data-3d

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Pooja 2013-4-18

Thanks for the reply.I am having .raw files of consultative committee for space data standards (CCSDS) .I am not able to open it.

Walter Roberson 2013-4-18

The most I can seem to find is the commercial product from ledin.com which is a Telemetry toolbox for MATLAB.

I have not checked to see if that handles DELTA-DOR files.

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Jan 2013-4-18

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"Raw" means an individually defined binary format usually. Because there are many different formats named "raw", you have to ask the creator how this file has been created and how the format is defined. But it is not reliable to let the forum's users guess, which RAW-format it might be.