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The Design of a Single-Bit CMOS Image Sensor for Iris Recognition Applications
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,...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5855011/ https://www.ncbi.nlm.nih.gov/pubmed/29495273 http://dx.doi.org/10.3390/s18020669 |
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author | Park, Keunyeol Song, Minkyu Kim, Soo Youn |
author_facet | Park, Keunyeol Song, Minkyu Kim, Soo Youn |
author_sort | Park, Keunyeol |
collection | PubMed |
description | 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 mm(2) 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. |
format | Online Article Text |
id | pubmed-5855011 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-58550112018-03-20 The Design of a Single-Bit CMOS Image Sensor for Iris Recognition Applications Park, Keunyeol Song, Minkyu Kim, Soo Youn Sensors (Basel) Article 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 mm(2) 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. MDPI 2018-02-24 /pmc/articles/PMC5855011/ /pubmed/29495273 http://dx.doi.org/10.3390/s18020669 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Park, Keunyeol Song, Minkyu Kim, Soo Youn The Design of a Single-Bit CMOS Image Sensor for Iris Recognition Applications |
title | The Design of a Single-Bit CMOS Image Sensor for Iris Recognition Applications |
title_full | The Design of a Single-Bit CMOS Image Sensor for Iris Recognition Applications |
title_fullStr | The Design of a Single-Bit CMOS Image Sensor for Iris Recognition Applications |
title_full_unstemmed | The Design of a Single-Bit CMOS Image Sensor for Iris Recognition Applications |
title_short | The Design of a Single-Bit CMOS Image Sensor for Iris Recognition Applications |
title_sort | design of a single-bit cmos image sensor for iris recognition applications |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5855011/ https://www.ncbi.nlm.nih.gov/pubmed/29495273 http://dx.doi.org/10.3390/s18020669 |
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