APPENDIX B
Radiometric and Photometric Quantities
B.1 RADIOMETRIC QUANTITIES
Radiometry deals with the measurement of energy in an electromagnetic field. We shall define a few radiometric quantities that are of interest to image processing.
B.1.1 Radiant Energy
Radiant energy, Q, is the energy contained in an electromagnetic field or the energy delivered to a given receptor by such a field and its unit is joules (J).
B.1.2 Radiant Flux
Radiant flux, Φ, or power is the time rate of change of radiant energy, Q. It is the rate at which radiant energy is transferred between two regions. It is measured in watts, which is joules per second.
B.1.3 Radiant Exitance
Radiant exitance M is the flux density, i.e., it is the flux per unit area leaving a point ...
Get Digital Image Processing with Application to Digital Cinema now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
