A 500dpi capacitive-type CMOS fingerprint sensor with pixel-level adaptive image enhancement scheme is discussed. A virtually-grounded metal shield effectively suppresses the parasitic capacitances without extra circuits and a configurable diffusion network is used to generate a adaptive local threshold level for pixel-level image enhancement. Capacitve-type CMOS fingerprint sensors have advantages of compact size and low-power consumption compared to optical sensors without any requirement of additional components.
|Journal||Digest of Technical Papers - IEEE International Solid-State Circuits Conference|
|Publication status||Published - 2002|
|Event||2002 IEEE International Solid-State Circuits Conference - San Francisco, CA, United States|
Duration: 2002 Feb 3 → 2002 Feb 7
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering