1. A method of global parallax correction for an array camera having at least first and second image sensors and processing circuitry, the method comprising: capturing first and second images using the first and second image sensors, respectively, wherein the first and second images contain at least one object having edges; with the processing circuitry, computing first and second edge images based on the first and second images, respectively, wherein the first and second edge images contain the edges of the at least one object in the first and second images; and with the processing circuitry, generating a first global parallax correction based on the first and second edge images, wherein generating the first global parallax correction based on the first and second edge images comprises: with the processing circuitry, computing a first horizontal projection curve based on a horizontal projection of the first edge image and a second horizontal projection curve based on a horizontal projection of the second edge image.