blind-watermark 0.3.1

Blind Watermark in Python

blind-watermark

Blind watermark based on wavelet transform.

• Documentation: https://BlindWatermark.github.io/blind_watermark/#/en/
• 文档： https://BlindWatermark.github.io/blind_watermark/#/zh/
• 中文 readme README_cn.md
• Source code: https://github.com/guofei9987/blind_watermark

install

pip install blind-watermark

For the current developer version:

git clone [e-mail]:guofei9987/blind_watermark.git
cd blind_watermark
pip install .

How to use

How to embed watermark:

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')

How to extract watermark

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', )

demos:

origin image	watermark

image embedded with watermark	extracted watermark

Attack on the embedded image

attack method	image after attack	extracted watermark
Rotate 45 Degrees 旋转攻击.py
Many Coverage 多遮挡攻击.py
50% Horizontal Crop 横向裁剪攻击.py
50% Vertical Crop 纵向裁剪攻击.py
Resize（1200X1920->600X800） 缩放攻击.py
Pepper Noise 椒盐击.py
Brightness 10% Up 亮度调高攻击.py
Brightness 10% Down 亮度调暗攻击.py

embed string

Embed:

from blind_watermark import WaterMark

bwm1 = WaterMark(password_img=1, password_wm=1)
bwm1.read_img('pic/ori_img.jpg')
wm = '@guofei9987 开源万岁！'
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:

bwm1 = WaterMark(password_img=1, password_wm=1)
wm_extract = bwm1.extract('output/embedded.png', wm_shape=len_wm, mode='str')
print(wm_extract)

Output:

@guofei9987 开源万岁！

embed array of bits

As demo, we embed 6 bytes data:

wm = [True, False, True, True, True, False]

Embed:

from blind_watermark import WaterMark

bwm1 = WaterMark(password_img=1, password_wm=1)
bwm1.read_ori_img('pic/ori_img.jpg')
bwm1.read_wm([True, False, True, True, True, False], mode='bit')
bwm1.embed('output/embedded.png')

Extract:

bwm1 = WaterMark(password_img=1, password_wm=1, wm_shape=6)
wm_extract = bwm1.extract('output/打上水印的图.png', mode='bit')
print(wm_extract)

Notice that wm_shape (shape of watermark) is necessary

The output wm_extract is an array of float. set a threshold such as 0.5.

Concurrency

WaterMark(..., processes=None)

• processes: number of processes, can be integer. Default None, meaning use all processes.