Pretrained model psnr is 28.6136, less than result in paper 28.88

[alg-leon]

I test the output png generate by your pretrained model.

But psnr is 28.615,less than the result in paper 28.88. Could you provide your eval code. Thanks a lot!!

folder = '.\sid\Sony';

path_list = dir(fullfile(folder,'\*_out.png'));
img_num = length(path_list);
%calculate psnr
total_ssim = 0;
if img_num > 0 
   for j = 1:img_num 
       image_name = path_list(j).name;
       input = imread(fullfile(folder,image_name));
       gt = imread(fullfile(folder,[image_name(1:end-8), '_gt.png']));
       psnr_val = psnr(im2double(input), im2double(gt));
       total_psnr = total_psnr + psnr_val;       
   end
end