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    <p>DDSM images are compressed in .LJPEG format and they need to be decompressed first before processing them.</p> <p>I've figured out a way to convert DDSM images into raw images, but it is a long way, and I don't have a better way.</p> <ul> <li><p><strong>Reading DDSM dataset images in steps:</strong></p> <ol> <li>Clone the repository at <a href="https://github.com/multinormal/ddsm" rel="nofollow noreferrer">https://github.com/multinormal/ddsm</a>, which contain two executables [ <code>jpeg.exe</code> and <code>ddsmraw2pnm.exe</code> ].</li> </ol></li> </ul> <p>2- Download and install <a href="http://cygwin.com/setup.exe" rel="nofollow noreferrer">cygwin</a>.</p> <p>3- Download and setup <a href="http://www.mathworks.com/matlabcentral/fileexchange/4176-pnm-toolbox-3-01?download=true" rel="nofollow noreferrer">Matlab pnmreader code</a>.</p> <p>4- Create a folder and make its contents like the following:<br></p> <ul> <li>jpeg.exe</li> <li>ddsmraw2pnm.exe</li> <li>ConvertDDSMImageToRaw.m [ <em>implementation comes later in answer</em> ]</li> <li>cygwin1.dll [ <em>from "C:\cygwin" or anwhere else where you've installed cygwin</em> ]<br></li> </ul> <p>5- the <code>ConvertDDSMImageToRaw</code> function implementation.</p> <pre><code>function ConvertDDSMImageToRaw(filename, columns, rows, digitizer) %// ConvertDDSMImageToRaw Convert an image of ddsm database to raw image. %// ------------------------------------------------------------------------- %// Input:- %// o filename : String representing ddsm image file name. %// o columns : Double representing number of columns in the image. %// o rows : Double representing number of rows in the image. %// o digitizer: String representing image normalization function name, %// which differ from one case to another and have the set of %// values ['dba', 'howtek-mgh', 'howtek-ismd' and 'lumisys' ] %// ------------------------------------------------------------------------- %// Prepare and execute command of image decompression commandDecompression = [which('jpeg.exe') ' -d -s ' filename]; dos(commandDecompression); %// ------------------------------------------------------------------------- %// Prepare and execute command that convert the decompressed image to pnm format. rawFileName = [ filename '.1']; columns = num2str(columns); rows = num2str(rows); digitizer = ['"' digitizer '"']; commandConversion =[ which('pnm.exe') ,' ',rawFileName,' ',columns,' ',rows,' ',digitizer]; dos(commandConversion); %// ------------------------------------------------------------------------- %// Wrtie the image into raw format pnmFileName = [rawFileName '-ddsmraw2pnm.pnm']; image = pnmread(pnmFileName); imwrite(image,[filename '.raw']); end </code></pre> <p>6- get the image information <code>[cols,rows,digitizer]</code> from the .ics file:</p> <p><img src="https://i.stack.imgur.com/pbuJd.png" alt=".ics file example"></p> <p>if the digitizer is 'howtek' use it as 'howtek-mgh', that's what I've figured out.</p> <p>7- convert you image now using the function we've impelemented, like the following:</p> <pre><code>filename = 'A_1709_1.LEFT_CC.LJPEG'; digitizer = 'howtek-mgh'; imageSize = [ 5341 2806 ]; ConvertDDSMImageToRaw(filename, imageSize(1) , imageSize(2), digitizer); </code></pre>
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    1. POGetting data from Digital Database for Screening Mammography (DDSM)
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    1. USSameh Kamal
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    1. CO+1 for detailed and nice answer
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    2. COLJPEG ... another "interesting" exotic image file format. Is there a sample file anywhere publicly available for testing this procedure?
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    3. CO@ernestopheles .. you can download some images from [http://marathon.csee.usf.edu/Mammography/Database.html]
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