1. A method of capturing and processing an image of a document on a mobile device, comprising: activating an image capture device on the mobile device; capturing a plurality of preview images of the document using the image capture device, wherein the image capture device captures each of the plurality of preview images with a lower image quality than an image quality associated with the image capture device capturing a final image; for each of the plurality of preview images, measuring at least one parameter associated with the capturing of the preview image, wherein the at least one parameter is related to the ability to accurately extract text and other content from a captured preview image of the document based on a confidence level; selecting a preview image among a subset of the plurality of preview images that passes the image quality measurement based on the at least one parameter, wherein the selected preview image is temporarily stored; and when a predetermined condition is met, choosing the temporarily stored preview image as a final selected image of the document.