blind_watermark

Sun, 26 Oct 2025 15:25:42 +0800

guofei9987/blind_watermark

Blind watermark based on DWT-DCT-SVD.

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

`1`	`pip install blind-watermark`

For the current developer version:

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

How to use

Use in bash

# embed watermark into image:
blind_watermark --embed --pwd 1234 examples/pic/ori_img.jpeg "watermark text" examples/output/embedded.png
# extract watermark from image:
blind_watermark --extract --pwd 1234 --wm_shape 111 examples/output/embedded.png

Use in Python

Original Image + Watermark = Watermarked Image

+ ‘@guofei9987 开源万岁！’ =

See the codes

Embed watermark:

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 watermark:

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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！

attacks on Watermarked Image

attack method	image after attack	extracted watermark
Rotate 45 Degrees		‘@guofei9987 开源万岁！’
Random crop		‘@guofei9987 开源万岁！’
Masks		‘@guofei9987 开源万岁！’
Vertical cut		‘@guofei9987 开源万岁！’
Horizontal cut		‘@guofei9987 开源万岁！’
Resize		‘@guofei9987 开源万岁！’
Pepper Noise		‘@guofei9987 开源万岁！’
Brightness 10% Down		‘@guofei9987 开源万岁！’

embed images

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')

Extract watermark:

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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', )

attack method	image after attack	extracted watermark
Rotate 45 Degrees
Random crop
Mask

embed array of bits

See it here

As demo, we embed 6 bytes data:

`1`	`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:

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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

`1`	`WaterMark(..., processes=None)`

processes number of processes, can be integer. Default None, which means using all processes.

text_blind_watermark (Embed message into text): https://github.com/guofei9987/text_blind_watermark
HideInfo（hide as image, hide as sounds, hide as text）：https://github.com/guofei9987/HideInfo

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