Image Aquisition Flashcards
1
Q
what is image acquisition
A
creation of a digital representation of the visual characteristics of an object
2
Q
how does image acquisition work?
A
- lens focuses image on sensor
- sensitivity to infrared light reduced by filter
- sensor turns light into recordable image
3
Q
focal length
A
1/f = 1/s (lens to sensor) + 1/sā (lens to object)
4
Q
magnification (m)
A
image / object = - s/sā
5
Q
what is a photodiode
A
most common and basic sensor for image acquisition
it generates charge proportional to the number of photons that reach it
6
Q
CCD (Charged coupled device)
A
lower noise, higher power consumption
7
Q
CMOS (complementary metal oxide semi conductor)
A
higher noise but lower power consumption
8
Q
Bilinear interpolation
A
uses the 4 nearest neighbours and takes their weighted average to produce output
