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Computers don’t “see” photos and videos in the same way that people do. When you look at a photo, you might see your best friend standing in front of her house. From a computer’s perspective, that same image is simply a bunch of data that it may interpret as shapes and information about color values. While a computer won’t react like you do when you see that photo, a computer can be trained to recognize certain patterns of color and shapes. For example, a computer might be trained to recognize the common patterns of shapes and colors that make up a digital image of a face. This process is known as facial detection, and it’s the technology that helps Google to protect your privacy on services like Street View, where computers try to detect and then blur the faces of any people that may have been standing on the street as the Street View car drove by. It is also what helps services like Google+ photos suggest that you tag a photo or video, since it seems like there might be a face present. Facial detection won’t tell you whose face it is, but it can help to find the faces in your photos.
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