Table of Contents
Advertisement
4 Functionality
4.8.2 Gamma
The 'Gamma' mode performs an exponential amplification, configurable in the range from 0.4
to 4.0. Gamma > 1.0 results in an attenuation of the image (see Fig. 4.39), gamma < 1.0 results
in an amplification (see Fig. 4.40). Gamma correction is often used for tone mapping and
better display of results on monitor screens.
300
250
200
150
100
50
0
0
Figure 4.39: Applying gamma correction to an image (gamma > 1)
300
250
200
150
100
50
0
0
Figure 4.40: Applying gamma correction to an image (gamma < 1)
52 of 109
Grey level transformation − Gamma: y = (255 / 1023
200
400
x: grey level input value (10 bit) [DN]
Grey level transformation − Gamma: y = (255 / 1023
200
400
x: grey level input value (10 bit) [DN]
γ
γ
) ⋅ x
(γ ≥ 1)
600
800
γ
γ
) ⋅ x
(γ ≤ 1)
600
800
γ = 1.0
γ = 1.2
γ = 1.5
γ = 1.8
γ = 2.5
γ = 4.0
1000
1200
γ = 1.0
γ = 0.9
γ = 0.8
γ = 0.6
γ = 0.4
1000
1200
MAN064 02/2020 V1.1
Advertisement
Table of Contents
