A method for processing a batch of documents, comprising the following steps: - digitising the batch of documents previously prepared by addition of a calibration page to one of the ends of the batch of documents to be processed, so that the calibration page is one of the end pages of the batch, wherein said calibration page is free of any writing, and to which is manually applied by a user at least one reference mark of colour, location and/or shape characteristics freely chosen by the user, the colour of which does not belong to the grey range, and by application of at least one separation mark the properties of which are similar to those of the reference mark applied to the calibration page, wherein said separation mark is applied manually by the user to an end page of each document of the batch to be processed; - after scanning the first page of the batch of documents to be processed, detecting the presence/absence of the calibration page by analysing and calculating the current characteristics comprising the proportion, distribution and colour of the pixels of the first page thus scanned, wherein the presence of the calibration page is detected when its digital representation corresponds to a blank page comprising a reference mark, of chosen characteristics, the colour of which does not belong to the grey range; - if the calibration page is present, smoothing the digital representation of the calibration page so as to reduce the significance of single pixels, the colour of which is not similar to white, and subsequently eliminating pixels, the colour of which is in the grey, black and white range; - memorising the chosen properties of the non-removed pixels corresponding to the reference mark; - after scanning the other pages of the batch to be processed, analysing and calculating the current characteristics of the digital representations of each page, and comparing the similarity of said current characteristics thus calculated with the characteristics chosen by the user from the reference mark applied to the calibration page; and - in case of positive similarity, separating the document from the batch according to the separation mark thus recognised, and saving the current document comprising all the previously analysed pages that have not been saved in a separate document. - digitising the batch of documents previously prepared by addition of a calibration page to one of the ends of the batch of documents to be processed, so that the calibration page is one of the end pages of the batch, wherein said calibration page is free of any writing, and to which is manually applied by a user at least one reference mark of colour, location and/or shape characteristics freely chosen by the user, the colour of which does not belong to the grey range, and by application of at least one separation mark the properties of which are similar to those of the reference mark applied to the calibration page, wherein said separation mark is applied manually by the user to an end page of each document of the batch to be processed; - after scanning the first page of the batch of documents to be processed, detecting the presence/absence of the calibration page by analysing and calculating the current characteristics comprising the proportion, distribution and colour of the pixels of the first page thus scanned, wherein the presence of the calibration page is detected when its digital representation corresponds to a blank page comprising a reference mark, of chosen characteristics, the colour of which does not belong to the grey range; - if the calibration page is present, smoothing the digital representation of the calibration page so as to reduce the significance of single pixels, the colour of which is not similar to white, and subsequently eliminating pixels, the colour of which is in the grey, black and white range; - memorising the chosen properties of the non-removed pixels corresponding to the reference mark; - after scanning the other pages of the batch to be processed, analysing and calculating the current characteristics of the digital representations of each page, and comparing the similarity of said current characteristics thus calculated with the characteristics chosen by the user from the reference mark applied to the calibration page; and - in case of positive similarity, separating the document from the batch according to the separation mark thus recognised, and saving the current document comprising all the previously analysed pages that have not been saved in a separate document.