Jamison Lofthouse wrote:
The subject sounds exactly like the reCAPTCHA< https://www.google.com/recaptcha/intro/index.html%3E tagline. Not sure how beneficial the project would be but I have seen it used. Maybe worth looking into. Thanks, Negative24
I should note that the latest reCAPTCHA¹ is actually *less* friendly. ¹ the “please select all images of foobars” version.
I don't think it should be considered as the “best solution” (for wikis where it's suitable to install), nor should we repeat their errors.
A small list:
1) It still has user assumptions based on 1a) language: the user must understand what a "foobar" is before he can select those², and they aren't always common use words, precisely.
1b) cultural: will the user easily discover all the photos expected to be coffee if that's not a common beverage on his country?
² no, the sample image³ is not enough to discern what they want. At least with the expected easiness.
³ confusing UI btw, since the naive assumption would be to expect you also had to tick it (which is disabled).
2) confusing images: Sometimes it's not clear what is depicted in the photograph. Not even being a human.
3) wrong images: Sometimes there are images that are not really foobars (suppose they are the similar barfoos), and thus *shouldn't* be marked as such. But according to recaptcha they are. (and your grudgingly selection of the barfoo in order to pass the captcha probably means that Google is performing a wrong training reinforcing their idea that it is indeed a foobar)
In terms of difficulty for humans I would score them as: images recaptcha > original reCaptcha > door numbers recaptcha > nocaptcha recaptcha