Abstract: A credit transaction system and a method thereof using fingerprint information strengthen an authentication function of a card user's identity. The system includes a terminal for credit transactions which has a function of authenticating the identity of the card user using the fingerprint and transmits transaction particulars and card information of the card user; a transaction approval determining unit for receiving the transaction particulars and the card information from the terminal, confirming a credit status of the card user, and informing an approval/rejection of the transactions to the terminal; and a management server, connected to the terminal, for mutually communicating the fingerprint information and the card information with the terminal.

Abstract: The method for acquiring fingerprint by using a linear fingerprint detecting sensor comprises the steps of: capturing a fingerprint image sequentially through the fingerprint detecting sensor; dividing scanned fingerprint image as a predetermined segments according to a constant time and speed; detecting the optimum overlap region by comparing each image strip and its segment with the next image strip; calculating the value of mean image variation through the overlap region; and mixing the entire image by applying the mean image variation value to each image strip. According to the present invention, the method for acquiring fingerprints by a linear fingerprint detecting sensor in accordance with the present invention can improve the correct recognition rate greatly by estimating and compensating for the scanned image by the fingerprint detecting sensor and accurately restoring the same to the original image.