How can I read specific images from TID2013 dataset in MATLAB? - matlab

Question

How can I read specific images from TID2013 dataset in MATLAB? I written the following code but it start from first to end of the list. The images are in this format: ixx.yy.z.bmp means xx is the number of image, yy is the model of the noise and z is the level of the noise. I just want to work with models 1,2 in level 4,5 but I don't know how to do it. please someone help me! By the way there are 25 reference images, 24 models of noise and 5 level of each model of noise that I wrote them vertically in info1.txt , info2.txt , info3.txt respectively.
clc; clear; close all;
% read Original images
cd 'C:\Users\Desktop'
for NO1 = 1:25
in1 = fopen('info1.txt');
xx = fgets(in1);
A = imread(strcat('C:\Users\Desktop\reference_images\',xx,'.bmp'));
A = rgb2gray(A);
end
% read distorted images
for NO1 = 1:25
in1 = fopen('info1.txt');
xx = fgets(in1);
for NO2 = 1:24
in2 = fopen('info2.txt');
yy = fgets(in2);
for NO3 = 1:5
in3 = fopen('info3.txt');
z = fgets(in3);
B = imread(strcat('C:\Users\Desktop\distorted_images\',xx,yy,z,'.bmp'));
B = rgb2gray(B);
C = imadjust(B);
% Write restored images
imwrite(C,['C:\Users\Desktop\restored_images\','i',sprintf('%02d',NO1),'_',sprintf('%02d',NO2),'_',num2str(NO3),'.bmp']);
end
end
end

Answer 1

The only thing you need to do is to change values of your for loops. Note that in matlab, in contrast with most other languages, for-loops are not restricted to specific step length and can be any vectors.
imageNames = textread('info1.txt', '%s');
noiseModels = textread('info2.txt', '%s');
noiseLevels = textread('info3.txt', '%s');
imageIndices = 1:25;
modelIndices = [1, 2, 7:8];
levelindices = [4 5];
sourceDir = 'C:\Users\Desktop\distorted_images\';
destDir = 'C:\Users\Desktop\restored_images\';
for ii = imageIndices
name = imageNames{ii};
for jj = modelIndices
model = noiseModels{jj};
for kk = levelindices
level = noiseLevels{kk};
sourcePath = sprintf('%s%s%s%s.bmp', sourceDir, name, model, level)
destPath = sprintf('%si%02d_%02d_%02d.bmp', destDir, ii, jj, kk)
B = imread(sourcePath);
B = rgb2gray(B);
C = imadjust(B);
imwrite(C, destPath);
end
end
end