Journal of the Korea Institute of Information and Communication Engineering (한국정보통신학회논문지)

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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Image Sensor Module for Detecting Space Illuminance in Indoor Environment

실내 환경의 공간조도 검출을 위한 이미지센서모듈

  • Moon, Seong-Jae (Micro LED Research Center, Korea Photonics Technology Institute) ;
  • Lim, Yeong-Seog (Department of Electronics and computer Engineering, Chonnam National University)
  • Received : 2019.05.23
  • Accepted : 2019.06.17
  • Published : 2019.07.31
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Abstract

The traditional illuminance intensity detection method using a single sensor has a problem that uniformity of illuminance detection is deteriorated depending on the measurement position due to the narrow FOV characteristic. In order to overcome this problem, a method of detecting an average illuminance value through a plurality of illuminance sensors is used, but the complexity and detection error are increased. In this paper, we propose a illuminance intensity detection method based on a single image sensor with wide FOV. The proposed method can solve the problems such as system complexity and error increase of existing illuminance sensor. The test results show that the difference of average value is 12% using a illuminance sensor, 10.7% using five illuminance sensors, and 6.2% using an image sensor compared with the reference value using the color difference illuminometer. It is confirmed that the proposed method can easily and accurately detect the space illuminance with improved uniformity.

기존 단일 조도센서를 이용한 조도검출 방식은 좁은 FOV (Field of View) 특성 상 측정 위치에 따라 검출 조도의 균일도가 저하된다. 다수개의 조도센서를 통해 평균 조도값을 검출하는 방법은 복잡도 증가 및 계산과정에서 오류가 증가하는 문제점을 가지고 있다. 본 논문에서는 넓은 FOV를 가지는 하나의 이미지센서를 기반으로 한 조도검출 방법을 제안하였으며, 제안된 방법은 기존 조도센서가 가지는 시스템 복잡도, 오류 증가 등의 문제점이 해결 가능하다. 실내 환경에서의 성능평가 결과는 색차조도계 (CL-200A)를 이용한 기준값 대비 조도센서가 1개인 경우 평균 12%, 조도센서가 5개인 경우 평균 10.7%, 이미지센서의 경우 평균 6.2% 차이가 발생하는 것을 확인하였으며, 이를 통해 이미지센서를 기반으로 한 제안된 검출방법은 균일성이 향상된 공간조도를 간단하고 정확하게 검출할 수 있음을 확인하였다.

Keywords

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Fig. 1 Characteristic of Illumination sensor

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Fig. 2 Flow Chart of Space Illumination Detection Method

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Fig. 3 Operation of Auto Exposure

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Fig. 4 Block Diagram of Image Sensor Module

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Fig. 5 Operation of ISP

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Fig. 6 Generated Space Illumination Detection LUT

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Fig. 7 Circuit Diagram of Image Sensor and ISP

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Fig. 8 Manufactured Image Sensor Module and System Control

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Fig. 10 Implementation of CdS Sensor FW

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Fig. 9 Performance Evaluation Structure

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Fig. 11 Differences by Measurement Item

Table. 1 CL-200A Specifications

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Table. 2 Corrected Value of Illumination

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Table. 3 Data by Measurement Item

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