read_image.m

通过大小归一化,直方图均衡化的方式读取人脸表情图像数据,

function data = read_image( datafile, row, col )
% Read In Facial Expression Images from CED_WYU Database

if nargin < 3, col      = 32;         end
if nargin < 2, row      = 32;         end
if nargin < 1, datafile = 'DATAFILE'; end

tic

data.num_copy = 11; 
data.num_exp  = 7;
data.num_sub  = 10; 
data.row      = row;
data.col      = col;

filelist=dir('.\images\*.jpg');
N=length(filelist);
data.X = zeros(row, col, N);
data.y= kron(1:data.num_sub, ones(1,data.num_copy*data.num_exp));
for i=1:N
    I=imread(['.\images\' filelist(i).name]);
    I=imresize(I,[row,col],'bicubic');          %大小归一化
    II=histeq(I,255);                           %直方图均衡化
    II=double(II)/255;
    data.X(:, :, i) = II;
end

save(datafile, 'data');
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