Patent ID: 8498023

Claim:
An image scanning device comprising: a scanning unit configured to execute image scanning of a document and thereby generates image data; at least one processing unit configured to successively process the image data outputted from the scanning unit; a transmission unit configured to transmit the image data outputted from the processing unit; a storage unit, in which multiple buffer areas to be used for transferring the image data among the scanning unit, the at least one processing unit and the transmission unit are allocated; a controller configured to execute: acquiring information on usage status of each of the buffer areas during a period from scanning a part of the document consisting of a plurality of sheets or a period from scanning a part of the document consisting of a single sheet to transmission of the image data of the part of the document; changing storage area allocation at least between two of the buffer areas based on the usage status after acquiring the usage status of the part of the document; and scanning a remainder of the document using the buffer area after changing storage area allocation.