Generate arbitrary shape PRNU shown as such #27

New Issue

Benjamin_Loison · 2024-03-28T21:59:25+01:00

Benjamin_Loison commented

2024-03-28 21:59:25 +01:00

Would enable easy comprehension if adding images thanks to splitting helps.

See #21 and #24.

Would enable easy comprehension if adding images thanks to splitting helps. See #21 and #24.

Benjamin_Loison referenced this issue

2024-03-28 22:01:22 +01:00

Estimating fake PRNU on noise-free images #25

Benjamin_Loison added the

enhancement

high priority

quick

labels 2024-03-29 12:21:19 +01:00

Benjamin_Loison commented

2024-03-29 12:43:13 +01:00

import os
from PIL import Image, ImageFont, ImageDraw

# Supports `WIDTH` > `HEIGHT` and conversely.
WIDTH = 1_000
HEIGHT = 1_000
TEXT = 'PRNU'

img = Image.new('L', (WIDTH, HEIGHT))
draw = ImageDraw.Draw(img)
# I guess that the maximal character height is higher than the maximal character width. Hence, the `TEXT` may not be spanned on the full width.
fontSize = min(HEIGHT, WIDTH // len(TEXT))
font = ImageFont.truetype(os.path.expanduser('~/.local/share/fonts/impact.ttf'), fontSize)
# Center vertically, especially in the case `HEIGHT` > `WIDTH`.
draw.text((0, HEIGHT // 2 - fontSize // 2), TEXT, 255, font = font)

img.show()

I do not know if I have done anything on Linux Mint to have this font at this location.

find /usr/share/fonts/ -iname '*impact*'

does not return any result on my Linux Mint.

```py import os from PIL import Image, ImageFont, ImageDraw # Supports `WIDTH` > `HEIGHT` and conversely. WIDTH = 1_000 HEIGHT = 1_000 TEXT = 'PRNU' img = Image.new('L', (WIDTH, HEIGHT)) draw = ImageDraw.Draw(img) # I guess that the maximal character height is higher than the maximal character width. Hence, the `TEXT` may not be spanned on the full width. fontSize = min(HEIGHT, WIDTH // len(TEXT)) font = ImageFont.truetype(os.path.expanduser('~/.local/share/fonts/impact.ttf'), fontSize) # Center vertically, especially in the case `HEIGHT` > `WIDTH`. draw.text((0, HEIGHT // 2 - fontSize // 2), TEXT, 255, font = font) img.show() ``` I do not know if I have done anything on Linux Mint to have this font at this location. ```bash find /usr/share/fonts/ -iname '*impact*' ``` does not return any result on my Linux Mint.

Benjamin_Loison commented

2024-03-29 12:45:41 +01:00

Should also be able to Gaussian noise the generated text.