Output garbled characters

example： decode is "hello 123", after extract is:

Welcome to use blind-watermark, version = 0.4.4 Make sure the version is the same when encode and decode Your star means a lot: https://github.com/guofei9987/blind_watermark This message only show once. To close it: blind_watermark.bw_notes.close()

Extract succeed! watermark is: X'�����?.ި���