A Measurement Method for Spectral Responsivity of Digital Cameras

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  • SUGIURA Hiroaki
    Imaging Systems Laboratory Mitsubishi Electric Corporation
  • KUNO Tetsuya
    Imaging Systems Laboratory Mitsubishi Electric Corporation
  • MATOBA Narihiro
    Information Technology R&D Center Mitsubishi Electric Corporation
  • IKEDA Hiroaki
    Department of Urban Environment Systems Faculty of Engineering, Chiba University

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Other Title
  • ディジタルカメラの分光応答度特性測定方法
  • ディジタル カメラ ノ ブンコウ オウトウド トクセイ ソクテイ ホウホウ

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Abstract

In order to achieve color management for open systems such as Internet, it is important to elucidate the color characteristics of individual equipment. Traditionally, printed test charts have been employed to evaluate the color reproduction of digital cameras. But this evaluation method could not measure the spectral responsivity which is the most fundamental color characteristics of digital cameras. Color signal outputs from digital cameras can be calculated from spectral distribution of an illumination, spectral reflectance of a shooting object, and spectral responsivity of a camera. The methods of measuring spectral distribution of illuminations and spectral reflectance of objects have been established unambiguously, and their characteristics are available from various databases. However, no accurate methods have been clearly defined regarding the measurement of the spectral responsivity characteristics of digital cameras. This paper describes the measurement method which realize to measure the spectral responsivity including negative lobes. As the subject of our new measurement method, we assume a digital camera which simply adopt linear matrix for color signal processing. The newly developed methods can reduce the effects of measurement errors caused by automatic functions such as automatic exposure controlling or automatic white balancing which are adopted by the majority of consumer digital cameras. This paper also describes an arrangement of equipment, definition of test chart and raw data handling together with some worked examples. The International Standard based on our methods has been published as IEC 61966-9.

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