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Blind watermark based on dct and svd.
pip install blind-watermark
For the current developer version:
git clone git@github.com:guofei9987/blind_watermark.git
cd blind_watermark
pip install .
# 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
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:
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！
| 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 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:
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 | |
|
See it here
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.
WaterMark(..., processes=None)
processes: number of processes, can be integer. Default None, meaning use all processes.text_blind_watermark: https://github.com/guofei9987/text_blind_watermark
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