The document discusses a new smartphone app called PhotoScan that allows users to digitally scan physical photos into high-quality digital files using just a smartphone camera. The app uses advanced computer vision algorithms to detect the edges of each photo and stitch the images together into a single high-resolution digital file that can be easily shared online or printed. PhotoScan eliminates the need for a physical scanner and provides a simple way for users to digitize their old photo collections with just a phone.