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5 Functionality
5.4
Multiple Slope Mode (High Dynamic Range)
The Multiple Slope High Dynamic Range (HDR) mode is a special integration mode that
increases the dynamic range of the pixels, and thus avoids the saturation of the pixels in many
cases. The multiple slope mode is also called multiple slope mode or piecewise linear mode.
The multiple slope mode clips illuminated pixels which reach a programmable voltage, while
leaving the darker pixels untouched (see Fig. 5.25). The clipping level can be adjusted once (2
slopes) or twice (3 slopes) within the exposure time.
Parameters:
Multislope_Mode
There are 3 predefined multiple slope parameter sets:
LowCompression
,
NormalCompression
and
HighCompression
. If
Multislope_Mode
is set to
UserDefined
then the
individual parameters can be set to user defined values.
Multislope_NrSlopes
Number of slopes.
Multislope_NrSlopes
=2: 2 slopes with only kneepoint B.
Multislope_NrSlopes
=3: 3 slopes with kneepoints A and B.
Multislope_Value1
Corresponds to Vlow1: the higher the value, the higher the compression.
Multislope_Time1
Time corresponding to kneepoint B. The value is the fraction (per mill) of
the total exposure time.
Multislope_Value2
Corresponds to Vlow2: the higher the value, the higher the compression.
This value is ignored if
Multislope_NrSlopes
=2.
Multislope_Time2
Time corresponding to kneepoint A. The value is the fraction (per mill) of
the total exposure time. This value is ignored if
Multislope_NrSlopes
=2.
The red line in Fig. 5.25 shows a pixel with high illumination. Without the multiple slope
mode, the pixel would have reached its saturated value. With multiple slope mode, the pixel
reaches value P1 which is below the saturation value. The resulting pixel response in this case is
shown in Fig. 5.26. The blue line (P2) shows a pixel with low illumination. Its value never
reaches Vlow2 or Vlow1 at the kneepoints and the resulting response is linear.
The parameters
Multislope_Value1
and
Multislope_Value2
are only applied after
a camera trigger. Note that in free-running mode the camera trigger is applied
internally by the camera itself.
58 of 123
MAN069 12/2018 V1.1
Summary of Contents for MV1-D4096 Series
Page 1: ...Photonfocus MV1 D4096 Camera Series CMOS camera with GigE interface MAN069 12 2018 V1 1 ...
Page 10: ...1 Preface 10 of 123 MAN069 12 2018 V1 1 ...
Page 12: ...2 Introduction 12 of 123 MAN069 12 2018 V1 1 ...
Page 32: ...4 Product Specification 32 of 123 MAN069 12 2018 V1 1 ...
Page 94: ...6 Hardware Interface 94 of 123 MAN069 12 2018 V1 1 ...
Page 108: ...7 Software 108 of 123 MAN069 12 2018 V1 1 ...
Page 110: ...8 Mechanical Considerations 110 of 123 MAN069 12 2018 V1 1 ...
Page 112: ...9 Troubleshooting 112 of 123 MAN069 12 2018 V1 1 ...
Page 118: ...12 Support and Repair 118 of 123 MAN069 12 2018 V1 1 ...
Page 120: ...13 References 120 of 123 MAN069 12 2018 V1 1 ...
Page 124: ...B Camera Revisions 124 of 123 MAN069 12 2018 V1 1 ...