Contact image sensor module for banknote recognition

• Main Authors: ZHAO YUMIN, WU LIANYU, SHI OU, PENG TONG
• Format: Patent
• Language: Chinese; English
• Published: 18.01.2012
• Subjects: CHECKING-DEVICES; HANDLING OF COINS OR OF PAPER CURRENCY OR SIMILAR VALUABLEPAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING,DISPENSING, CHANGING OR DEPOSITING; PHYSICS

The invention relates to a contact image sensor module for banknote recognition, which comprises a contact image sensor (CIS) which is used for converting an image into a voltage signal; a resolution setting circuit which is used for setting different resolutions of the CIS; a light-emitting diode (LED) constant-current drive circuit which is used for controlling the magnitude of the drive current of an LED and keeping the drive current to be constant; an analog front-end (AFE) circuit which is used for amplifying the analog signal of the image; a field programmable gate array (FPGA) logic device which is used for generating control signals for the CIS, the resolution setting circuit, the LED constant-current drive circuit, the AFE circuit and the like; and a parallel-to-serial conversion circuit which is used for completing the parallel-to-serial conversion of a digital image signal, wherein the input of the parallel-to-serial conversion circuit comes from the AFE circuit and the output of the parallel-to-se