dicom_decode_jpg8.m
4b5355e68791master

dicom_decode_jpg8.m
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			function pixel_cells = dicom_decode_jpg8(comp_fragment)
			%DICOM_DECODE_JPG8 Decode a JPEG compressed bytestream.
			% PIXEL_CELLS = DICOM_DECODE_JPG8(COMP_FRAGMENT) decompresses the 8-bit
			% to 16-bit lossy or lossless JPEG compressed fragment COMP_FRAGMENT and
			% returns the decompressed PIXEL_CELLS. PIXEL_CELLS is an m-by-n
			% rectangular array of image data returned by IMREAD and contains a
			% complete, correctly shaped and oriented image.
			%
			% PIXEL_CELLS is a UINT8 array is the JPEG file contains 8 or fewer bytes
			% per sample. Otherwise PIXEL_CELLS is a UINT16 array. PIXEL_CELLS will
			% need to be cast to a signed type if the DICOM file's Pixel Representation
			% is 1.
			%
			% See also: IMREAD, IMFINFO.

			% Copyright 1993-2010 The MathWorks, Inc.

			% Open a temporary file for the JPEG data.
			tmp_file = tempname;
			fid = fopen(tmp_file, 'w');

			if (fid < 3)
			error(message('images:dicom_decode_jpg8:CouldNotOpenFile', tmp_file))
			end

			% Write the JPEG bytestream to the file.
			count = fwrite(fid, comp_fragment, 'uint8');

			if (count ~= length(comp_fragment))
			warning(message('images:dicom_decode_jpg8:dataTruncatedWhenWritingToTempFile'))
			end

			% Close the temporary file.
			fclose(fid);

			% Reread the file.
			try
			pixel_cells = imread(tmp_file, 'jpeg');
			catch ME
			delete(tmp_file);
			rethrow(ME)
			end

			% Remove the temporary file.
			try
			delete(tmp_file);
			catch
			warning(message('images:dicom_decode_jpg8:CouldNotDeleteTempFile', tmp_file))
			end