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How to Use a Digital Camera as a Metering Device
In image capturing, digital sensors have practically displaced the use of photo film. Sensors have a number of advantages in comparison with films: - Conversion of the intensity into digital data is instantaneous (as compared with the procedure of film processing). - Sensors have a large enough dynamic range to achieve a high exposure latitude (it can be increased even more with special means). - Rigid coordinate system may be defined in terms of the pixel number in the image. - Sensor-receiving elements have high repeatability of the geometry and energy parameters. - There is good correspondence of the image data flow with computer storage and processing. These advantages are particularly essential for optical measurements. Progress in computer processor speeds and in calculation techniques led to a jump forward in the use of digital image processing such that it is now widely used in all fields of research, practically displacing pure optical analog methods. In this Spotlight, we consider three fields in which measurements could be implemented with the use of an ordinary digital camera: distance, intensity, and wavelength.
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