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Sensors 2018, 18(2), 669; doi:10.3390/s18020669

The Design of a Single-Bit CMOS Image Sensor for Iris Recognition Applications

Department of Semiconductor Science, Dongguk University-Seoul, Seoul 04620, Korea
Author to whom correspondence should be addressed.
Received: 10 January 2018 / Revised: 22 February 2018 / Accepted: 23 February 2018 / Published: 24 February 2018
(This article belongs to the Special Issue Image Sensors)
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This paper presents a single-bit CMOS image sensor (CIS) that uses a data processing technique with an edge detection block for simple iris segmentation. In order to recognize the iris image, the image sensor conventionally captures high-resolution image data in digital code, extracts the iris data, and then compares it with a reference image through a recognition algorithm. However, in this case, the frame rate decreases by the time required for digital signal conversion of multi-bit digital data through the analog-to-digital converter (ADC) in the CIS. In order to reduce the overall processing time as well as the power consumption, we propose a data processing technique with an exclusive OR (XOR) logic gate to obtain single-bit and edge detection image data instead of multi-bit image data through the ADC. In addition, we propose a logarithmic counter to efficiently measure single-bit image data that can be applied to the iris recognition algorithm. The effective area of the proposed single-bit image sensor (174 × 144 pixel) is 2.84 mm2 with a 0.18 μm 1-poly 4-metal CMOS image sensor process. The power consumption of the proposed single-bit CIS is 2.8 mW with a 3.3 V of supply voltage and 520 frame/s of the maximum frame rates. The error rate of the ADC is 0.24 least significant bit (LSB) on an 8-bit ADC basis at a 50 MHz sampling frequency. View Full-Text
Keywords: Analog-to-digital converter; CMOS image sensor; edge detection; iris recognition; XOR Analog-to-digital converter; CMOS image sensor; edge detection; iris recognition; XOR

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Park, K.; Song, M.; Kim, S.Y. The Design of a Single-Bit CMOS Image Sensor for Iris Recognition Applications. Sensors 2018, 18, 669.

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