| Patent Number |
Title Of Patent |
Date Issued |
| 6980286 |
Ultra-thin optical fingerprint sensor with anamorphic optics |
December 27, 2005 |
| Disclosed is an ultra-thin optical imaging sensor with anamorphic optics comprising of an image capturing panel an anamorphic optical lens of at least two optical magnification powers, and an imaging sensor. The image sensor captures a light reflection from an image deposited on the imag |
| 6894723 |
Ranking-based automatic dark compensation circuit |
May 17, 2005 |
| A ranking-based automatic dark compensation circuit for efficiently estimating dark level in a CCD or CMOS image sensor. The ranking circuit comprises of k staggered comparators, each comparator having an associated temporary result register. Each comparator having two inputs, with the |
| 6763127 |
Apparatus and method for fingerprint recognition system |
July 13, 2004 |
| A fingerprint recognition method includes iterative gamma correction that compensates moisture effect, feature extraction operations, directional morphological filtering that effectively links broken ridges and breaks smeared ridges, adaptive image alignment by local minutia matching, gl |
| 6750955 |
Compact optical fingerprint sensor and method |
June 15, 2004 |
| For use in capturing a fingerprint image, an optical fingerprint sensor. In one embodiment of the present invention, the optical fingerprint sensor includes: (1) a light source on a PCB assembly, (2) a diffuser that receives light from the light source, (3) a right angle prism that r |
| 6538695 |
On-chip fixed-pattern noise calibration for CMOS image sensors |
March 25, 2003 |
| An on-chip FPN calibration method and circuits scheme applying a reference voltage signal to an array of calibration pixels coupled to a sensor matrix. Two data values are read from each bit line and used to calculate an offset and a gain error for a pixel column. A reference offset and |
| 6137432 |
Low-power column parallel ADC in CMOS image sensors |
October 24, 2000 |
| A low-power column parallel ADC architecture for image sensors that reduces the power consumption by reducing the number of switchings of a comparator to digitize a row of pixel data. Two ramp reference signals are provided in accordance with the principles of this invention. A first ram |
