catering enterprises can use mark watermark camera to record food. Chefs or waiters can take photos of dishes, add time and place watermarks to the photos, and record the making process and setting effect of dishes. This can help catering enterprises publicize dishes, attract customers' attention, and can also be used as a record of food quality and health and safety. These photos can be used in menus, promotional materials or social media to enhance the brand image and customer experience of the restaurant.