Abstract: An information processing method running on a mobile device for converting a textual representation of a currency amount from a base currency to a target currency is provided, including capturing an image of text including a currency amount from a selected region in a larger portion of text displayed on the display; determining the parameters of a region of interest by detecting one or more contours of individual characters located in the captured image; defining an analysis image by the mobile device by selecting a portion of the captured image using the parameters of the region of interest; recognizing a series of non-numerical symbols and numbers in the analysis image by the mobile device via optical character recognition; adding, by the mobile device, the recognized non-numerical symbols and the numbers as an entry in an array; selecting one of the entries from the array; converting the numerical amount from the base currency to the target currency; and overlaying in the selected region, the converted num