4.2
Pixel Response
4.2.1
Linear Response
The camera offers a linear response between input light signal and output grey level. This can
be modified by the use of LinLog
®
as described in the following sections. In addition, a linear
digital gain may be applied, as follows. Please see Table 3.2 for more model-dependent
information.
Black Level Adjustment
The black level is the average image value at no light intensity. It can be adjusted by the
software by changing the black level offset. Thus, the overall image gets brighter or darker.
Use a histogram to control the settings of the black level.
4.2.2
LinLog
®
Overview
The LinLog
®
technology from Photonfocus allows a logarithmic compression of high light
intensities inside the pixel. In contrast to the classical non-integrating logarithmic pixel, the
LinLog
®
pixel is an integrating pixel with global shutter and the possibility to control the
transition between linear and logarithmic mode.
In situations involving high intrascene contrast, a compression of the upper grey level region
can be achieved with the LinLog
®
technology. At low intensities each pixel shows a linear
response. At high intensities the response changes to logarithmic compression (see Fig. 4.10).
The transition region between linear and logarithmic response can be smoothly adjusted by
software and is continuously differentiable and monotonic.
G r e y
V a l u e
L i g h t I n t e n s i t y
0 %
1 0 0 %
L i n e a r
R e s p o n s e
S a t u r a t i o n
W e a k c o m p r e s s i o n
V a l u e 2
S t r o n g c o m p r e s s i o n
V a l u e 1
R e s u l t i n g L i n l o g
R e s p o n s e
Figure 4.10: Resulting LinLog2 response curve
LinLog
®
is controlled by up to 4 parameters (
Time1
,
Time2
,
Value1
and
Value2
).
Value1
and
Value2
correspond to the LinLog
®
voltage that is applied to the sensor. The higher the parameters
Value1
and
Value2
respectively, the stronger the compression for the high light intensities.
Time1
4.2 Pixel Response
29
Содержание CameraLink MV1-D1312 series
Страница 1: ...User Manual MV1 D1312 I CameraLink Series CMOS Area Scan Camera MAN041 09 2010 V2 5...
Страница 2: ......
Страница 4: ...2...
Страница 8: ...CONTENTS 6...
Страница 14: ...2 How to get started CameraLink 12...
Страница 24: ...3 Product Specification 22...
Страница 49: ...Figure 4 30 Example of decimation 2 on image of injection needle 4 3 Reduction of Image Size 47...
Страница 72: ...4 Functionality Figure 4 56 Unsharp Mask Examples 70...
Страница 110: ...8 Mechanical and Optical Considerations 108...
Страница 112: ...9 Warranty 110...
Страница 114: ...10 References 112...
Страница 118: ...A Pinouts 116...