Abstract: A binarization device for payment or accounting documents including sensitive data located in respective data window provides a primary binarized document file of the document; a memory stores identification files including identifying images and location information associated to given types of documents; the data window can be identified and localized as comparison with the identification files of the memory; the contribution of the background is subtracted from the window file, the window file is binarized and filtered for spurious pixels obtaining a binarized window file; the binarized document file and the binarized window file are merged to provide the binarized window file in the data window; the evidence of the significant pixel is obtained by sequential analysis on groups of pixels, applying morphological expansion operators on each group of pixels and following erosion of said group of pixels.

Abstract: A binarization device for payment or accounting documents including sensitive data located in respective data window provides a primary binarized document file of the document; a memory stores identification files including identifying images and location information associated to given types of documents; the data window can be identified and localized as comparison with the identification files of the memory; the contribution of the background is subtracted from the window file, the window file is binarized and filtered for spurious pixels obtaining a binarized window file; the binarized document file and the binarized window file are merged to provide the binarized window file in the data window; the evidence of the significant pixel is obtained by sequential analysis on groups of pixels, applying morphological expansion operators on each group of pixels and following erosion of said group of pixels.