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. 4.43), gamma < 1.0 results
in an amplification (see Fig. 4.44). Gamma correction is often used for tone mapping and
better display of results on monitor screens.
0
200
400
600
800
1000
1200
0
50
100
150
200
250
300
Grey level transformation − Gamma: y = (255 / 1023
γ
)
⋅
x
γ
(
γ
≥
1)
x: grey level input value (10 bit) [DN]
y: grey level output value (8 bit) [DN]
γ
= 1.0
γ
= 1.2
γ
= 1.5
γ
= 1.8
γ
= 2.5
γ
= 4.0
Figure 4.43: Applying gamma correction to an image (gamma > 1)
0
200
400
600
800
1000
1200
0
50
100
150
200
250
300
Grey level transformation − Gamma: y = (255 / 1023
γ
)
⋅
x
γ
(
γ
≤
1)
x: grey level input value (10 bit) [DN]
y: grey level output value (8 bit) [DN]
γ
= 1.0
γ
= 0.9
γ
= 0.8
γ
= 0.6
γ
= 0.4
Figure 4.44: Applying gamma correction to an image (gamma < 1)
64
Summary of Contents for SM2-D1312-TI6455
Page 1: ...User Manual SM2 D1312 TI6455 VisionCam PS CMOS DSP Camera MAN060 05 2013 V1 0...
Page 2: ......
Page 4: ...2...
Page 8: ...CONTENTS 6...
Page 48: ...4 Functionality Figure 4 28 Example of decimation 2 on image of injection needle 46...
Page 80: ...4 Functionality 78...
Page 110: ...6 Framework Functionalities 108...
Page 116: ...8 Warranty 114...
Page 118: ...9 References 116...
Page 122: ...A Pinouts 120...
Page 123: ...B Revision History Rev 1 0 May 2013 First version 121...
