The brightness value of a pixel in a digital image is recorded as
A) the absolute average amount of the solar radiance reflected from the pixel
B) a scaled digital number according to the radiometric resolution
C) a digital number ranging from 0 to 8
D) a digital number ranging from 0 to 12

Question

Quizplus · Accepted Answer

The brightness value of a pixel in a digital image is recorded as a scaled digital number according to the radiometric resolution. Radiometric resolution refers to the number of digital values that a sensor can detect, and therefore the range of brightness values that can be recorded. This is typically expressed as a power of two, such as 8-bit (2^8 = 256 values) or 12-bit (2^12 = 4096 values). Therefore, the brightness value of a pixel will be a digital number within the range of values that can be detected by the sensor's radiometric resolution.

The Brightness Value of a Pixel in a Digital Image