Evaluation of solid-state camera systems in varying illumination conditions

J. Saviaro, H. Ailisto, Laitinen Jyrki

    Research output: Contribution to journalArticleScientificpeer-review

    5 Citations (Scopus)

    Abstract

    We propose a practical method for the expeditious determination of the performance of imaging CCD and CMOS camera systems. Special attention is paid to the operation of these devices in varying illumination conditions, which is typical to many surveillance and consumer electronics applications. One emerging application utilizing imaging sensors in variable illumination conditions is the third generation mobile phone, which will deliver wirelessly pictures, graphics, and video. In our method, determination of the system performance is based on the imaging of a calibrated gray scale test chart as a function of illuminance. At each level of illumination the system response is characterized by a signal to random noise figure. The signal is calculated as the difference of the system response to the lightest and darkest areas of the gray scale. The random noise is measured as the standard deviation of the gray values in a difference of two successive images of the test pattern. The proposed method is applied in three exemplary cases: 1. comparison of inexpensive CCD and CMOS cameras, 2. analysis of the effect of wireless image transmission, and 3. comparison of the effects of automatic and manual gain controls.

    Original languageEnglish
    Pages (from-to)896-901
    Number of pages6
    JournalOptical Engineering
    Volume40
    Issue number6
    DOIs
    Publication statusPublished - 1 Jan 2001
    MoE publication typeA1 Journal article-refereed

    Keywords

    • Evaluation of CCD and CMOS cameras
    • Low light level imaging
    • Surveillance
    • Wireless image transmission

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