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详细说明： % Upsample. This is for regular upsampling comparison. img_upsampled = imresize(img_small, 2, 'bilinear'); [psnr_upsampled, ~] = psnr(img_upsampled, img); % DWT of the small image. [LL_small, LH_small, HL_small, HH_small] = dwt2(img_small, filter); dwt_upsampling_mode = 'bilinear'; LL_upsampledd = imresize(LL_small, 2, dwt_upsampling_mode); LH_upsampledd = imresize(LH_small, 2, dwt_upsampling_mode); HL_upsampledd = imresize(HL_small, 2, dwt_upsampling_mode); HH_upsampledd = imresize(HH_small, 2, dwt_upsampling_mode); LL_upsampl edd = LL_orig; % Upsample each DWT component. dwt_upsampling_mode = 'bicubic'; LL_upsampled = imresize(LL_small, 2, dwt_upsampling_mode); LH_upsampled = imresize(LH_small, 2, dwt_upsampling_mode); HL_upsampled = imresize(HL_small, 2, dwt_upsampling_mode); HH_upsampled = imresize(HH_small, 2, dwt_upsampling_mode); LL_upsampled = LL_orig; %LH_upsampled = LH_orig; %HL_upsampled = HL_orig; %HH_upsampled = HH_orig; img_dwt_upsampledd = idwt2(LL_upsampledd, LH_upsampledd, HL_upsampledd, HH_upsampledd, filter); img_dwt_upsampledd = imresize(img_dwt_upsampledd, size(img)); % IDWT of the upsampled. img_dwt_upsampled = idwt2(LL_upsampled, LH_upsampled, HL_upsampled, HH_upsampled, filter); img_dwt_upsampled = imresize(img_dwt_upsampled, size(img)); [psnr_dwt_upsampled, ~] = psnr(img_dwt_upsampled, img); ...展开收缩
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