Automatic Fingerprint Acquisition System An example employing Hardware-Software Co- Design - Komal kasat Nalini Kumar Gaurav Chitroda

Outline Motivation Introduction Finger-print Based Sensors System-On-Chip Architectures Hardware-Software System Co-Design Results and Conclusions Future Work

Motivation Differences in Biological characteristics Using them to improve security Using them in place of Pins and Passwords Fingerprint Recognition systems

Introduction Stages of Biometric Recognition Process - Enrolment: Measurement of particular Biometric characteristic of user - Authentication: Comparison of stored template and current input. - Processing and Action Phase Fingerprint Recognition Systems: - Ridges and Valleys Identification - Fingerprint Pores

Finger-print based sensors Optical sensors Ultrasound sensors RF sensors Silicon based Sensors Pressure based sensors Capacitance based sensors Thermal sensors

System-On-Chip Architecture

Hardware-Software Co-Design Overview : The paper focuses on the first stage of the System Acquisition and Reconstruction

HW-SW partitioning Compute-intensive tasks are selected to be implemented by Hardware - Image Acquisition and Reconstruction Less intensive tasks are implemented by Software running on Microprocessor - Sequence of steps or scheduling - Detection of finger on sensor

SOFTWARE TASKSHARDWARE TASKS T IMESEQUENCET IMESEQUENCE No Finger On Sensor Finger On Sensor Task 1: Finger Detection Task 3: Image Reconstruction Task 2: Slice Acquisition Task 4: Image Storage Task 5: END Fingerprint Acquisition No Finger On Sensor

Image Acquisition Stage A) Handling of the sensor to get the fingerprint slices B) Storage of the captured slices in a correct way

Reconstruction On-the-Fly Stage Tasks in Reconstruction Stage: a) Management of the concurrent acquisition stage, b) Reconstruction of the fingerprint image from the acquired slices c) Handshaking with the microcontroller in order to allow the image storage process.

Overlap is found between the first and second slices by line comparison. After detection of overlap an interrupt is generated to the microcontroller to transfer the overlapped lines to memory. Repeated till done or finger taken off

Acquisition time is obviously dependent on finger sliding speed. But good quality fingerprint images can be obtained at freq of 200 slices/sec.

Results and Conclusions The platform permits the Hw-Sw co- design of medium-low complex systems. The described architecture has provided the authors with a low-cost solution. The first stage of the Automated Fingerprint identification system is detailed.

Future Work To develop further stages: - image enhancement phase - Signature Extraction - Signature Storage - Biometric matching - Encryption of the verification result

Questions ???