8. A apparatus, comprising: an optical device for obtaining a two-dimensional image of the document; an edge detector for performing edge detection within the two-dimensional image to identify edges of the document; an angle detector for determining angles between detected edges; a three-dimensional position calculator for calculating, based on the detected edges and the angles determined, a three-dimensional position of the document relative to a position of the apparatus; a three-dimensional position correction calculator for calculating correction information to correct, by relative movement, the three-dimensional position of the document relative to the position of the apparatus; a guidance feedback processor for deriving first guidance information from the correction information, wherein the first guidance information is provided to a user of the apparatus, prompting the user to perform the relative movement such that the three-dimensional position of the document is correct relative to the position of the apparatus; and a document capture processor for capturing the document.
8. A apparatus, comprising: an optical device for obtaining a two-dimensional image of the document; an edge detector for performing edge detection within the two-dimensional image to identify edges of the document; an angle detector for determining angles between detected edges; a three-dimensional position calculator for calculating, based on the detected edges and the angles determined, a three-dimensional position of the document relative to a position of the apparatus; a three-dimensional position correction calculator for calculating correction information to correct, by relative movement, the three-dimensional position of the document relative to the position of the apparatus; a guidance feedback processor for deriving first guidance information from the correction information, wherein the first guidance information is provided to a user of the apparatus, prompting the user to perform the relative movement such that the three-dimensional position of the document is correct relative to the position of the apparatus; and a document capture processor for capturing the document. 10. The apparatus of claim 8 , further comprising: a relative document movement calculator for calculating, based on the correction information, an amount of the relative movement needed to correct the three-dimensional position of the document relative to the position of the apparatus; and an apparatus feedback processor for deriving second guidance information including the first guidance information and the amount of the relative movement needed to correct the three-dimensional position of the document relative to the position of the apparatus, wherein the second guidance information is provided to the user of the apparatus, prompting the user to perform the amount of the relative movement.