A method for extracting marked regions from document images
Masahiko Hase, Gen Suzuki, Hisayasu Itoh · Systems and Computers in Japan · 1987
Abstract A method of document management in the electronic filing is considered, where the abstract is prepared, filed and retrieved for each document. This paper discusses a method of preparing an abstract from the document image. A method is proposed in which the region marked by the user with a felt‐tip color‐pen, etc., is extracted automatically and filed. The features of the method are as follows: (1) in the extraction of the marked region from the marked document image, the difference of reflectivities between the background (white) and the marked region in the document is utilized; (2) to determine the position of the mark, the algorithm based on the peripheral distribution using the integration of pixels is employed from the viewpoint of speed and accuracy; (3) in the compression to extract only the marked region, a processing to replace n n pixels by a pixel is applied, from the viewpoint of hardware implementation and speed.