1. A method for reducing boundary jitter during a document image capture session, the method comprising: receiving a sequence of one or more video frames from an image capture device, wherein at least some of the video frames comprise a target object to be captured; identifying one or more polygons in the video frames; applying one or more intra-frame filters to the polygons to select one or more candidate object boundaries, wherein the one or more candidate object boundaries correspond to one of the polygons from a respective one or more of the video frames; applying one or more inter-frame filters to the one or more candidate object boundaries to select a particular one of the one or more candidate object boundaries that bounds the target object; and sending a representation of the particular one of the one or more candidate object boundaries to a graphics processor to be visually displayed on a display screen of the image capture device.