Digital

Detecting which digital number an image represents

Detecting which digital number an image represents
  1. What are digital numbers in remote sensing?
  2. What is digital number value?

What are digital numbers in remote sensing?

Digital number in remote sensing systems, a variable assigned to a pixel, usually in the form of a binary integer in the range of 0–255 (i.e. a byte). The range of energies examined in a remote sensing system is broken into 256 bins.

What is digital number value?

Each pixel also has a numerical value, called a digital number (DN), that records the intensity of electromagnetic energy measured for the ground resolution cell represented by that pixel. Digital numbers range from zero to some higher number on a gray scale.

Autocorrelation Expected value and autocorrelation
Expected value and autocorrelation
What is autocorrelation value?What is the difference between autocorrelation and autocovariance?What does the autocorrelation function tell you?What ...
Energy Energy or power of exponential summation signal
Energy or power of exponential summation signal
Is exponential function energy or power signal?How do you know if a signal is energy or power signal?Is exponential signal an energy signal?What is e...
Negative Is the negative spectrum (by DFT) of a real signal needed to reconstruct it?
Is the negative spectrum (by DFT) of a real signal needed to reconstruct it?
What does DFT do to a signal?What do negative values in FFT mean?Why are there negative frequencies in FFT?What happens if we apply DFT twice to a si...