What is the best way to programatically detect porn images? (2009) • Hacker News Board

Re: What is the best way to programatically detect porn images? (2009)

#51

Post by sireat » Wed, Oct 16, 2013, 3:19 PM UTC

selmnoo wrote: post #9

phorese wrote: post #8

Earlier quoted context omitted.

So i can literally get paid for looking at porn. Huh, who knew... :)

At the cost of your mental health, sure. I recall reading an article about the human workers who had this job at Google... they had crap benefits, crap pay, and no mental healthcare. As a result a lot of the people in the field had depression and other mental issues.

I signed up as a worker on MT a few years ago just for kicks. Let's just say that labeling adult images got old real fast.

Only interesting tasks were the psychology ones, but they got boring too (think Daniel Kahnemans experiments repeated ad nauseum).

How people last on MT longer than a month is something that I

Re: What is the best way to programatically detect porn images? (2009)

#52

Post by cobrausn » Wed, Oct 16, 2013, 3:20 PM UTC

nailer wrote: post #38

I used pifilter (now WeSEE:Filter , http://corp.wesee.com/products/filter/ ) for a production, realtime, anonymous confession site (imeveryone.com) in 2010. It cost, IIRC, a tenth of a cent per image URL. Rather than being based on skin tone, it was created based on algos to specifically identify labia, anuses, penises, etc. REST API: send a URL, get back a yes/no/maybe. You decided what to do with the maybes. My exp…

I don't remember where I read this, but someone once recommended having a bot that posts the image to 4chan b feed and monitor the views and replies. Since porn images on b usually had somewhat predictable replies, it would be a good way to augment another technique and prevent false positives. Funny idea, but not really sure how viable.

Re: What is the best way to programatically detect porn images? (2009)

#53

Post by singlow » Wed, Oct 16, 2013, 3:32 PM UTC

So, who's going to write the ROT13 algorithm for images. Just call it ROT128 and rotate the color value of the bits and use a ROT128 image viewer to view the original image.

Re: What is the best way to programatically detect porn images? (2009)

#54

Post by kalleboo » Wed, Oct 16, 2013, 3:37 PM UTC

singlow wrote: post #53

So, who's going to write the ROT13 algorithm for images. Just call it ROT128 and rotate the color value of the bits and use a ROT128 image viewer to view the original image.

That function is typically called "Invert".

Re: What is the best way to programatically detect porn images? (2009)

#55

Post by digitalsushi » Wed, Oct 16, 2013, 3:39 PM UTC

Invent an algorithm that can calculate humanity's creative thoughts.

Re: What is the best way to programatically detect porn images? (2009)

#56

Post by Fomite » Wed, Oct 16, 2013, 3:39 PM UTC

_mulder_ wrote: post #25

Here's an idea... Develop a bot to trawl NSFW sites and hash each image (combined with the 'skin detecting' algorithms detailed previously). Then compare the user uploaded image hash with those in the NSFW database. This technique relies on the assumption that NSFW images that are spammed onto social media sites will use images that already exist on NSFW sites (or are very similar to). Then it simply becomes a case o…

"This multi-TB disk array labeled 'Porn' has a legitimate business use!"

Re: What is the best way to programatically detect porn images? (2009)

#57

Post by level09 » Wed, Oct 16, 2013, 3:41 PM UTC

would any one be interested in purchasing an API subscription for this kind of service ? IMO, a pipeline of AI filters can be efficient to some extent.

Re: What is the best way to programatically detect porn images? (2009)

#58

Post by maddddddddddddd » Wed, Oct 16, 2013, 3:44 PM UTC

this is what i did my final image processing project on in college. it was fun to sit in front of a room of people with loads of porn on the projector.

bottom line: you can't do this with any acceptable level of accuracy.

Re: What is the best way to programatically detect porn images? (2009)

#59

Post by djent » Wed, Oct 16, 2013, 3:44 PM UTC

It wouldn't solve the entire problem, but you could look for the watermarks that major porn networks stamp on their images.

Re: What is the best way to programatically detect porn images? (2009)

#60

Post by t2d2 » Wed, Oct 16, 2013, 3:48 PM UTC

cobrausn wrote: post #52

nailer wrote: post #38

I used pifilter (now WeSEE:Filter , http://corp.wesee.com/products/filter/ ) for a production, realtime, anonymous confession site (imeveryone.com) in 2010. It cost, IIRC, a tenth of a cent per image URL. Rather than being based on skin tone, it was created based on algos to specifically identify labia, anuses, penises, etc. REST API: send a URL, get back a yes/no/maybe. You decided what to do with the maybes. My exp…

I don't remember where I read this, but someone once recommended having a bot that posts the image to 4chan b feed and monitor the views and replies. Since porn images on b usually had somewhat predictable replies, it would be a good way to augment another technique and prevent false positives. Funny idea, but not really sure how viable.

Using /b/ as an unpaid mechanical Turk alternative sounds intriguing yet profoundly disturbing.

Imagine being able to fire off a dozen /b/tards bots at the website or target of your choice.