/**
* Copyright 2012 Infogosoft
*
* This file is part of jsdicom.
*
* jsdicom is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
*
* jsdicom is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with jsdicom. If not, see http://www.gnu.org/licenses/.
*/
function instance_number_sort(filelist) {
    filelist.sort(function(a,b) {
        return a.InstanceNumber - b.InstanceNumber;
    });
}

function min_max_voi(file) {
    var min = Math.min.apply(this, file.PixelData);
    var max = Math.max.apply(this, file.PixelData);
    var center = min + (max-min)/2;
    var level = max-min;
    return [center, level];
}