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Camera Resolution: Combining Detector and Optics Performance

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Most image-quality discussions center on resolution, which is thought to uniquely determine system performance. Resolution, however, is a more complex concept.

Gerald C. Holst, JCD Publishing

Camera resolution depends upon the optical blur diameter and the detector size. Schade combined these to create an equivalent resolution that is a function of Fλ/d where F is the focal ratio, λ is the average wavelength, and d is the detector size. In the spatial domain 2.44 Fλ/d is the ratio of the Airy disc diameter to the detector size. In the frequency domain, it is the ratio of the detector cut-off to the optics cut-off (Figure 1). Figure 1. The system MTF is MTFSYS = MTFOPTICSMTFDETECTOR. Since the detector MTF dominates, this is a detector-limited system...Read full article

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    Glossary
    airy disc
    The central peak (including everything interior to the first zero or dark ring) of the focal diffraction pattern of a uniformly irradiated, aberration-free circular optical element or system.
    resolution
    1. In optics, the ability of a lens system to reproduce the points, lines and surfaces in an object as separate entities in the image. 2. The minimum adjustment increment effectively achievable by a positioning mechanism. 3. In image processing, the accuracy with which brightness, spatial parameters and frame rate are divided into discrete levels.
    detector
    1. A device designed to convert the energy of incident radiation into another form for the determination of the presence of the radiation. The device may function by electrical, photographic or visual means. 2. A device that provides an electric output that is a useful measure of the radiation that is incident on the device.
    camerasFeaturesCCDAiry discinfrared cameraslensesBasic ScienceDetectors, Cameras & ImagingresolutionSensors & DetectorsCCD cameradetectorOpticsImaging

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