Welcome to another day of my 75 writing. Because clearly, nothing brings joy like discovering how a single rebellious pixel can throw your…Continue reading on Coinmonks »Welcome to another day of my 75 writing. Because clearly, nothing brings joy like discovering how a single rebellious pixel can throw your…Continue reading on Coinmonks »
The One Pixel Attack: How a Single Dot Can Fool Deep Learning
Welcome to another day of my 75 writing. Because clearly, nothing brings joy like discovering how a single rebellious pixel can throw your super-smart AI into a full-blown identity crisis. Today’s hot mess is called the One Pixel Attack — an adversarial trick that proves our so-called intelligent machines are, in fact, overconfident clowns in digital disguise.
Let’s warm up with some basics. A neural network for image classification takes an image x (say, a dog picture) and outputs a class label f(x) (hopefully “dog”). More formally, you can think of it like this:
f(x): R^(m × n × 3) → {1, 2, …, K}
Here:
- m × n = width × height of the image,
- 3 = color channels (RGB),
- K = number of possible classes (dog, cat, airplane, etc.).
Now, the One Pixel Attack asks a very simple but devilish question:
What if I only change one single pixel in this giant grid of pixels? Could I trick the model into completely misclassifying the image?
Formally, the attacker wants to find another image x' such that:
- The difference between
xandx'is at most 1 pixel. - The label changes: f(x’) ≠ f(x).
That’s it. One dot. One tiny insult to the network’s intelligence. And shockingly, it works.
Why does one pixel matter?
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