Google+ released an amazing feature that uses object recognition to tag photos.
Here is a Reddit thread discussing it. Generalized object recognition is an incredibly difficult problem - this is the first product that I have seen which supports it. This isn't a gimmick - it can recognize objects in pictures without *any* corresponding text information (such as in the filename, title, comments, etc). Here are some examples on my photos (none of these photos contain any corresponding text data to help):
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjya932cGSPo-mWgoM29PdB53TBnHkS8w4T8IQJMKO64WQ0Oum1lW45z75TN67k4LlbE7x63ajVDHYu18ItDPTdk2hCp8UTHhh7I1tCG4CaxEoP_1mxlFvy6bgGEdZyUHmu3XOV/s320/plane.png)
At first I thought this last one was a misclassification, until I zoomed in further and saw a tiny plane:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgF2e8PBOYk-n_T6hhoEFXwkidMuY79xmAb37HRxM-HeaBZwIF2u6pMkziLhqfsypcDKPihsihEOPbeguZDkTe2XGffUeO9uGRissutSdusjNYlFLIYaSTFGkvNOvsprtGMv0PR/s320/plane2.png)
Of course, there are also many misclassifications since this is such a hard problem:
This squirrel came up for [cat]:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiSLj9u4jbUzJjR5BA2WEOcKvPKzOBsoiV0hD7pwg-E9ro3Lge5dmiVyVumP7QJN5VVUz7_sOUerHM8_wh5mnYCwZmczJo-0ApwFxUMi0bSEAHDoC_xbz8BHWUD9ngZP5OU21oB/s320/cat.png)
This train came up for [car]:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgyvjOjpmaMXRAfHXM9aQZD0szSPF42Ja3kDR7boeHQcL2r_-kKoyk1XPkUPLAIYX5z3XxVS7tmqddPJExyyJLZWPePg_-Uqci59bSka_6majDGP2PofhbywgbXWjMGlfjPsvLV/s320/car.png)
This goat came up for [dog]:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhRUPgGiE4xGz-W_Ua_Lf1UjMKLa-stsGr2ZTfsVjtB_ph_3xot1DZwP9H5HQzDJ7zjNQRqzqqbaZ73phweO7dfN4g0mwn0te6IZvkkVSIdMC_AYdwoyBpE1YaDrFIzN1JJ8xr_/s320/dog.png)
These fireworks came up for [flower]:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhx5TPBPHtCZbz0_w7gloU5Sji6rwrgkefNBFl0BYjHqdp2D-_q4ul1Dgf-tybFj8SWY3GcYPcC5YUR84oGuXQux0zWmEIBYRb1hg82mSHuud9N0fwcl2JfWUWa8Tv0V1vD3eq-/s320/flowers.png)
This millipede came up for [snake]:
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