Every time you upload a photo to Facebook or some of the company's services, labels or tags are added automatically. One of the reasons for this addition is that tags can help visually impaired people to understand pictures posted on Facebook (according to the company).
But the fact shows how much the algorithm has developed on Facebook. Needless to say, each tag or tag is automatically added to the bigger social networking data.
And while Facebook's image recognition algorithm continues to evolve to improve existing services such as searching or making sure that images do not violate social networking policies, it can also add information that is not part of the metadata of the image.
The algorithm that analyzes images in Facebook adds more basic tags like sky, tree, cat, and other words that define the image.
Since April 2016 Facebook automatically adds alt tags to the images you upload so they are filled with words-wrenches που αντιπροσωπεύουν το περιεχόμενο των εικόνων σας. Η επισήμανση των εικόνων σας γίνεται από το Deep ConvNet που αναπτύχθηκε από την team Facebook FAIR.
If you're interested in learning how and which labels Facebook adds to your photos, you can install a browser add-on that reveals them.
The Show Facebook Desktop Vision Tags is a browser add-on for him Chrome and Firefox. After installation all you need to do is visit Facebook. You will notice that in the photos that are on the social network, you also see the tags in the upper right corner.
Tags are only in the photos uploaded by someone and not in the images added with a link.
The images you see and do not have labels are because Facebook's image recognition algorithm has had trouble locating the image.
It seems that the algorithm doesn't work correctly for all images and it sure keeps the Facebook engineers busy. But as you will notice it does very well work of for most of the photos on the website.
