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Digital photogrammetry: 
» pixel size 
: image quality 
: noise considerations 
Ulf Almroth 
The Royal Institute of Technology 
Department of Photogrammetry 
Stockholm, 1985 
ABSTRACT 
INTROOUCTION 
RESOLUTION ANO PIXEL SIZE 
3.1 Sampling in the Space Domain 
3.2 Resolution, Modulation Transfer and Threshold Modulation 
3.3 Application to Digital Systems 
NOISE IN THE PHOTOGRAPHIC IMAGE 
4.1 Granularity 
4.2 Spectral Characteristics of Grain Noise 
4.3 Signal-dependent and -independent Noise 
A MODEL FOR THE DIGITIZING PROCESS 
5.1 Digitizing with a Finite Aperture 
5.2 Stochastic Models. 
NOISE AND QUANTIZATION 
6.1 Probability of Separating Two Areas of Different Brightness 
6.2 Performance Measures 
6.3 Application to Film Digitizing 
IMAGE QUALITY AND SYSTEM PERFORMANCE 
CONCLUSIONS 
8.1 Pixel Size 
8.2 Image Quality and System Performance Measures 
REFERENCES 
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