Blind watermarking is a 'invisible stamping' technology that can embed watermarks in pictures that are difficult for the human eye to detect. Only with the help of programs can they be identified and extracted. It is commonly used in data leakage traceability, copyright protection and other scenarios. This library can extract watermarks without the original picture and supports the identification of watermarks after the picture is cropped or rotated, as well as password encryption and other functions.