Use hunger games to take advantage of historical price data present in OFF product's picture

[serpico]

Problem

Related to #107. While browsing certain categories on OFF website I noticed some specific product's sticker mentioned the price, weight , price per kg and additional infos which could be used to populate open prices for example https://world.openfoodfacts.org/category/comte

The location can even be inferred using the logo of the shop and either the town and/or postal code also printed on the stickers ex https://world.openfoodfacts.org/product/2460576024479/comte-aop-15-mois-d-affinage
I don't have a clear idea how often that's the case but I've seen dozens of those stickers for comté alone - and it's probably true for other cheeses packaged à la coupe, meat...

Maybe start with only several selected categories and ask "is there a price on the sticker?" ( or something similar ) and filter through the "deck" of pictures...

Additional context

I have no idea how much of (semi)automatic prefiltering could realistically be done before the data collected can be added to open price, so it could be a lot of work for not much result, but some of the pictures date back 5 years ago or more so it's interesting from an historical perspective.

There's also the issue of the date ( open price use the date of purchase or the date the price tag was photographed as proof ) in that case data available on the sticker are usually packaging date and best before/expiration date, would that be enough for the prices to be accepted into open prices ? can we use the picture's timestamp ?

For the value discount yes/no I've seen stickers promotion on some pictures.

Shop's disambiguation, what if there's several shops from the same chain in the same postal code area ?

[raphodn]

fyi I created a discussion here on a related idea (leverage Hunger Games to crowdsource prices)