Finding the pattern of a backdoor

[EvilWatermelon]

Hi,

I try to find the backdoor pattern from the add_pattern_bd() in my poisoned images. I need this pattern as an image file. Do you have this image or can I generate it from the function? I use this function in PoisoningAttackBackdoor(add_pattern_bd).

[beat-buesser]

Hi @EvilWatermelon I think the easiest approach would be to run add_pattern_bd() on an array and set add_pattern_bd() then the patterns should be in the 3x3 pixels in the bottom-right corner and you select these pixels from the returned array and save as image. Would this work for you?

[EvilWatermelon]

Yes, that could work. OpenCV can convert arrays to images and back. Thanks!