1. A computer implemented method for identifying interest points, the computer implemented method comprising: receiving a set of digital images and a set of threshold values, wherein the set of digital images includes a set of digital frames; calculating a set of directional values for each pixel in a set of pixels within each digital frame in the set of digital frames to form a number of directional values; identifying a set of interest points within each digital frame in the set of digital frames using the set of threshold values and the number of directional values; and determining a set of characteristics for the set of interest points.