March 2020
Intermediate to advanced
366 pages
9h 8m
English
book
OpenCV 4 with Python Blueprints - Second Edition
by Dr. Menua Gevorgyan, Michael Beyeler (USD), Arsen Mamikonyan, Michael Beyeler
Content preview from OpenCV 4 with Python Blueprints - Second Edition
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ISO speed
ISO speed is the sensitivity of the sensors used in cameras. It is measured using numbers that map the sensitivity of the digital sensor to the chemical films that were used when computers were not around yet.
ISO speed is measured in two numbers; for example, 100/21°, where the first number is the speed on the arithmetic scale and the second number is the number on the logarithmic scale. Since these numbers have a one-to-one mapping, usually the second one is omitted, and we simply write ISO 100. ISO 100 is two times less sensitive to light than ISO 200 and it is said that the difference is 1 stop.
It is easier to talk in powers of 2 rather than powers of 10, so photographers came up with the notion of stops. One stop is two times ...