How to Use a Digital Camera as a Metering Device

How to Use a Digital Camera as a Metering Device
Author(s):    Tatiana Mironova; Alexander Kraiski
Published:   2016
DOI:             10.1117/3.2256725
eISBN: 9781510604971
Description:

This Spotlight discusses how to use a standard commercial digital camera as a very exact metering device in correlation, colorimetric, and intensity measurements. After extracting and calibrating linear data from the camera matrix, the resulting characteristics are comparable with those of technical cameras.

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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.

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