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Author: zhgqcn

Pretreatment/generate_LR_metasr_X1_X4.m

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+function generate_LR_metasr_X1_X4()
+%% settings
+path_save = 'D:\ALL_DataSet\BSDS\train_HR_4';
+path_src = 'D:\ALL_DataSet\BSDS\train_HR_2';
+ext               =  {'*.png'};
+filepaths           =  [];
+for i = 1 : length(ext)
+    filepaths = cat(1,filepaths, dir(fullfile(path_src, ext{i})));
+end
+nb_im = length(filepaths);
+DIV2K_HR = [];
+
+for idx_im = 1:nb_im
+    fprintf('Read HR :%d\n', idx_im);
+    ImHR = imread(fullfile(path_src, filepaths(idx_im).name));
+    DIV2K_HR{idx_im} = ImHR;
+end
+FolderLR_bicubic = fullfile(path_save,'LR_bicubic')
+if ~exist(FolderLR_bicubic)
+    mkdir(FolderLR_bicubic)
+end
+    
+%% generate and save LR via imresize() with Bicubic
+for scale=2:2
+    FolderLR = fullfile(path_save,'LR_bicubic', sprintf('X%.2f',scale));
+    
+    if ~exist(FolderLR)
+        mkdir(FolderLR)
+    end
+    for IdxIm = 1:nb_im
+        fprintf('IdxIm=%d\n', IdxIm);
+        ImHR = DIV2K_HR{IdxIm};
+        [h,w,n]=size(ImHR);
+        if mod(h,scale) ~= 0
+            h = h - 4;
+        end
+        if mod(w,scale) ~= 0
+            w = w - 4;
+        end
+        ImHR =ImHR(1:h,1:w,:);
+        ImLR = imresize(ImHR, 1/scale, 'bicubic');
+        % name image
+        fileName = filepaths(IdxIm).name
+        NameLR = fullfile(FolderLR, fileName);
+        % save image
+        imwrite(ImLR, NameLR, 'png');
+    end
+end
+
+
+end