0.4.0: reimplementation SHARPENBAD 

0.3.1: added SDSNR 

0.3.0: correct UM 

0.2.9: execution time of ssin and vifp by 4 times down 

0.2.8: fixed vifp1 and added mse-c and psnr-c 

0.2.5: smallfry 

0.2.4: init