1. A method comprising: receiving, by a computing device, an input image of an environment having a plurality of overlapping physical notes, each the plurality of physical notes having a background color and a border having a border color different from the background color; processing the input image with the computing device to apply a color segmenting process to identify, based on the background colors and the border colors of the overlapping physical notes, borders of each of the overlapping physical notes in the input image; processing the identified borders of each of the overlapping physical notes as fiducial markers for the respective physical note to extract, based on the fiducial markers, content for each of the respective overlapping physical notes, wherein the extracted content for a respective physical note includes portions of the border of the respective overlapping physical note not covered by another physical note of the plurality of overlapping physical notes; creating, by the computing device, a plurality of digital notes, each of the digital notes representing a particular one of the identified overlapping physical notes; and associating, by the computing device, the extracted content for each respective physical note of the identified overlapping physical notes with a corresponding digital note of the plurality of digital notes that represents the respective physical note.