In this issue, we recommend a Python tool for adding and extracting blind watermarks from images—Blind Watermark.

blind_watermark is a Python tool that can add and extract blind watermarks from images, and supports four ways: adding numbers, embedding images, embedding text, and embedding binaries. It can prevent effects such as rotation angle, random screenshots, multiple occlusion, vertical cropping, horizontal cropping, zoom attacks, etc.

Installation

pip install blind-watermark

Or install the latest development version

git clone git@github.com:guofei9987/blind_watermark.git
cd blind_watermark
pip install .

use

command line

# Embed Watermark:
blind_watermark –embed –pwd 1234 examples/pic/ori_img.jpeg “watermark text” examples/output/embedded.png

# Extract Watermark:
blind_watermark –extract –pwd 1234 –wm_shape 111 examples/output/embedded.png

Python

• Embed text watermarks
  from blind_watermark import WaterMark

  bwm1 = WaterMark(password_img=1, password_wm=1)
  bwm1.read_img(‘pic/ori_img.jpg’)
  wm = ‘@guofei9987 Long live open source! ‘
  bwm1.read_wm(wm, mode=’str’)
  bwm1.embed(‘output/embedded.png’)
  len_wm = len(bwm1.wm_bit)
  print(‘Put down the length of wm_bit {len_wm}’.format(len_wm=len_wm))
  Extract text watermarks
  bwm1 = WaterMark(password_img=1, password_wm=1)
  wm_extract = bwm1.extract(‘output/embedded.png’, wm_shape=len_wm, mode=’str’)
  print(wm_extract)
  Embed image watermarks
  from blind_watermark import WaterMark

  bwm1 = WaterMark(password_wm=1, password_img=1)
  # read original image
  bwm1.read_img(‘pic/ori_img.jpg’)
  # read watermark
  bwm1.read_wm(‘pic/watermark.png’)
  # embed
  bwm1.embed(‘output/embedded.png’)
  Extract image watermarks
  bwm1 = WaterMark(password_wm=1, password_img=1)
  # notice that wm_shape is necessary
  bwm1.extract(filename=’output/embedded.png’, wm_shape=(128, 128), out_wm_name=’output/extracted.png’, )

Effects of various attacks