Morfology operation for face extraction MRI構造画像から顔表面画像の抽出 ---- Input file name imagefile : Analyze 3D image file (*.img) ---- output variable surf_face.V = vertex point in face (SPM-Right-[m] coordinate) surf_face.F = patch index for face surf_face.face_parm = parameter structure extracting face 2006/2/3 M.Sato Copyright (C) 2011, ATR All Rights Reserved. License : New BSD License(see VBMEG_LICENSE.txt)
0001 function [surf_face] = vb_job_face(imagefile,face_parm) 0002 % 0003 % Morfology operation for face extraction 0004 % MRI構造画像から顔表面画像の抽出 0005 % 0006 % ---- Input file name 0007 % imagefile : Analyze 3D image file (*.img) 0008 % ---- output variable 0009 % surf_face.V = vertex point in face (SPM-Right-[m] coordinate) 0010 % surf_face.F = patch index for face 0011 % surf_face.face_parm = parameter structure extracting face 0012 % 0013 % 2006/2/3 M.Sato 0014 % 0015 % Copyright (C) 2011, ATR All Rights Reserved. 0016 % License : New BSD License(see VBMEG_LICENSE.txt) 0017 0018 0019 if ~exist('imagefile','var') 0020 %%%% DEBUG Setting %%%% 0021 udir = [getenv('MATHOME') '/SBIdata-new/Retino-TY/']; 0022 imagefile = [udir '3D.img']; 0023 facefile = [udir 'TY.face.mat']; 0024 end 0025 0026 % 0027 % ----- Usually, following setting need not be changed. 0028 % However, if extraction result is not good enough, 0029 % change the morphology operation by setting 'Radius' 0030 0031 % Manual threshold value for face extraction 0032 % ヒストグラムからの自動設定ではなく手で閾値を設定する場合、 0033 % 閾値 'Graylevel' 設定 : Graylevel より大きい値を持つボクセルを頭部として抽出 0034 if ~exist('face_parm','var') | ~isfield(face_parm,'Graylevel') 0035 Graylevel = []; 0036 face_parm.Graylevel = Graylevel; 0037 else 0038 Graylevel = face_parm.Graylevel; 0039 end 0040 0041 % ---- Define order and size of dilation/erosion ---- 0042 % Dilation/erosion are done consecutively according to Radius 0043 % 穴埋め・孤立点削除 (モルフォロジー) 変換の順序と半径を指定 0044 % 0045 % Radius [mm] of Morfology operation 0046 % R > 0 : dilation 0047 % R < 0 : erosion 0048 % Example of 'Radius' 0049 % Radius = [ -2 2 ]; : remove small island in background 0050 % Radius = [ -2 2 6 -6]; : remove small island & fill holes 0051 % 1. remove small island in background (R = -2, 2) 0052 % 2. fill holes inside the brain (R = 6, -6) 0053 0054 % Default morphology setting parameter 0055 if ~isfield(face_parm,'Radius') 0056 Radius = [ -2 2 2 2 2 -2 -2 -2]; 0057 face_parm.Radius = Radius; 0058 else 0059 Radius = face_parm.Radius; 0060 end 0061 0062 % Subsampling step size [mm] 0063 % 3D 画像処理のための間引きステップサイズ 0064 if ~isfield(face_parm,'step') 0065 step = 1; 0066 face_parm.step = step; 0067 else 0068 step = face_parm.step; 0069 end 0070 0071 % Prob. to detrmine Threshold value for face extraction 0072 % using Rayleigh distribution 0073 % : 背景ノイズが従うRayleigh分布に含まれると判断する閾値確率 0074 % この値が大きいほど閾値が大きくなる 0075 % Standard value: pmax = 0.998 or 0.999 0076 if ~isfield(face_parm,'pmax') 0077 pmax = 0.998; 0078 face_parm.pmax = pmax; 0079 else 0080 pmax = face_parm.pmax; 0081 end 0082 0083 % 0084 % ---- Morfology operation for face extraction 0085 % MRI構造画像から顔表面画像の抽出 0086 % 0087 [Fface, Vface] = vb_face_extract(imagefile , Radius, step, pmax, Graylevel); 0088 0089 % 0090 % ---- Output data 0091 % 0092 0093 surf_face.V = Vface; 0094 surf_face.F = Fface; 0095 surf_face.face_parm = face_parm; 0096 0097 Nmri = 3000; 0098 [surf_face.F_reduce, surf_face.V_reduce] = ... 0099 reducepatch(Fface, Vface, 2 * Nmri); 0100 0101 return 0102 % 0103 % ---- END ---- 0104 % 0105 vb_save(facefile,'surf_face','face_parm'); 0106 0107 % 顔表示 0108 figure; 0109 vb_plot_surf(surf_face.V ,surf_face.F, [0.8 0.7 0.6],'none',1); 0110 view([135, 15]); 0111