I just found this table from i2off + r3nder in Buenos Aires, Argentina. Their initial application looks very promising, and the fact that is running 100% over processing is great for an open source approach. I am still researching this project but I can tell you now they are doing blob detection with a libary build by v3ga which you can get here. Thank you a lot for the inspiration r3nder, and I hope you’ll join the community.
Also a group out of Italy have developed a full Processing based solution also based on “blobDetection” libary. A pdf is available in Italian, from their website.