Image noise Flashcards
1
Q
what is image noise
A
random variation of brightness or colour information in images
2
Q
Gaussian noise
A
caused by thermal agitation which is caused by the movement of electrons
3
Q
Uniform noise
A
not often encountered in the real world
4
Q
Impulse noise
A
aka salt and pepper noise. creates white and black dots resembling salt and pepper
–> remove using a median filter
5
Q
Sensor pattern noise: shot noise
A
due to random fluctuations in photon energy captured by the sensor
6
Q
Sensor pattern noise: Readout noise
A
electric charge built up with in the onboard processes which leaves random noise
7
Q
PRNU
A
Photo Response Non Uniformity
pattern produced is consistent and unique to the image sensor.
build an “exemplar print” to compare to the “latent print”
