Patent ID: 7469122
Filing Date: 2008-12-23
Classification: H04N

Abstract:
1. A document size detecting device, comprising: a flatbed having a first flatbed edge and a second flatbed edge intersecting with each other, wherein the flatbed is for a document having a first edge and a second edge to be placed thereon, at least one of the first edge and the second edge of the document is aligned with one of the first flatbed edge and the second flatbed edge; a sensing region, part of which is covered by only a part of the document, with a remainder of the document not covering the sensing region; a matrix optical sensing unit for capturing an image of the part of the document inside the sensing region and outputting an image signal accordingly, wherein the sensing region is formed on the flatbed according to a sensing ability of the matrix optical sensing unit; and a logic processing unit for receiving the image signal and determining the size of the document according to the image signal and a position relationship between the sensing region and the flatbed.