Starch-based films incorporated with different concentration of tea polyphenols ( TP) were developed

with the aid of solution casting method． The physical and functional properties of the films were systematically cha

racterized． The results shows that the TP produces no significant effect on the surface and moisture content of the films，but it reduces the transparency and contact angle． It is also noted that， the mechanical properties and water vapor permeability of the film show no linear changes with the increase of the content of TP． In addition， the presence of TP increases the antioxidant and antimicrobial activity of the starch-based films，and the inhibitory effect is more evident against Staphylococcus aureus． In the antibacterial test，a new automatic counting method based on computer vision and machine learning algorithm is established to count the colonies，which perform much faster

without subjective uncertainty．