1. A method of processing a digital video signal corresponding to an image, comprising acts of: identifying, using a first edge detecting process, a set of zero or more edges in the image based upon the digital video signal; identifying, using an independent second edge detecting process that is different than the first edge detecting process, at least one additional edge in the image that is not identified by the first edge detecting process; combining the set of edges and the at least one additional edge to generate an edge map that includes the set of edges and the at least one additional edge; and processing the digital video signal to modify visually perceptible artifacts in the image based upon the edge map, wherein the digital video signal includes luminance and chrominance components for each pixel of the image, and wherein at least one of the acts of identifying includes acts of: performing, for each pixel of the image, a 2-dimensional gradient measurement by convolving each pixel of the image with a pixel mask to determine horizontal and vertical gradient values for each luminance and chrominance component of a respective pixel; comparing an absolute value of each of the horizontal and vertical gradient values to a respective threshold; and identifying the respective pixel as an edge when the absolute value of at least one of the horizontal and vertical gradient values exceeds the respective threshold.