So far, you can't do much about it except keep your head down, covered with a wide-brimmed hat, and hope that someone won't snap a clear photo of you. But that's not a great solution if you don't want your life dramatically changed and your interactions with the world and the people in it made difficult.
"You can try wearing sunglasses. But sunglasses alone can't prevent face detection. Because face detection uses features like the eyes and nose, it's hard to prevent just by concealing your eyes," notes Isao Echizen, Associate Professor at the Digital Content and Media Sciences Research Division of Japan's National Institute of Informatics.
So, with the help of colleagues, the Professor Echizen has developed a device he dubbed "privacy visor", which uses 11 near-infrared LEDs to thwart face detection systems.
"Light from these near-infrared LEDs can't be seen by the human eye, but when it passes through a camera's imaging device, it appears bright. The LEDs are installed in these locations because, a feature of face detection is, the eyes and part of the nose appear dark, while another part of the nose appears bright. So, by placing light sources mostly near dark parts of the face, we've succeeded in canceling face detection characteristics, making face detection fail," he explained for DigInfo TV.
But not all camera are affected in this way by infrared light, so the researchers also created a simpler (and cheaper to produce) visor that uses reflective material instead of electricity to achieve the same goal.
These visors do seem somewhat cumbersome, and could definitely be a problem for people who need to wear prescription glasses. Also, let's face it, don't look nearly as cool as Google Glass.
Nevertheless, they might be a step in the right direction. As a pessimist / realist that knows that technological progress can't be stopped and that its evolution is already surpassing that of laws that should curb its use, I welcome any product and service that is geared towards protecting user privacy.