You can't, and that's demonstrated in this thing I made for fun: https://youtu.be/xzcdopwq7ok

A frame is 40 ms and you blink for more than 100.

Too much effort. Just print out a picture of a person with open eyes.

At that point it's really just the honor code that holds us to honesty.

Add heartbeat detection to verify the person is alive. [1] has one example, Google "use webcam to detect heartbeat" to find more.

[1] https://github.com/thearn/webcam-pulse-detector

Add gaze tracking and have people look at a randomly moving dot.

While entering captcha codes every 10 seconds

This is so useful!

Measurement of other minute facial feature movements besides blinking to detect whether it's a real person vs picture or other video?

I think we've just discovered the real use for Apple's Face ID. Staring contest video games.

>Does closing one eye at a time count

Bah, I just tried it and it did not alleviate my urge to blink! I still want to blink afterwards. Does work it for you?

I imagine drawing eyes on your eyelids would be enough.

Will need some kind of anti-cheating system

Yes we will think about it. Thx.

Trying to fool the blink detector might end up being more fun than not blinking.

That's true. lol

Do you really need it though? It would be pretty immediately obvious to the other player that their opponent is cheating.

The detector model now is not strong enough. It uses traditional computer vision concept to detect the blinking. We plan to combine deep learning to develop a more robust detector model in the future.

Do blind people not blink?

Edit: Figured I could look this up myself. As I thought, yes, they blink - blinking clears particles and such from your eyes. (That is, unless they have trauma that prevents them from blinking, of course.)

Thanks, I didn't think to look it up. I must have recalled a case where the person had such trauma and extended that to blind people in general.