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Software User Manual - Argos3D - P33x
Last change: 29 June 2020/Version 10
A frame average filter over up to 255 frames can be applied. The number of frames is configurable.
The frame rate of the data interface will be divided by the number of configured frames to be averaged, e.g., if
the camera is configured to 40 frames per second, and the frame average filter with number 4 is used, the
resulting output frame rate will be 10.
4.4
ToF Image Enhancements
4.4.1
Pixel invalidation
The Argos3D - P33x provides an on-board check for invalid pixels:
•
Underexposed pixels: The amplitude is too low for the distance value to be trustworthy. The Argos3D -
P33x sets the pixel distance to the maximum value. The threshold is set via register
ConfidenceThresLow
.
•
Overexposed pixels: The amplitude is too high for the distance value to be trustworthy. The Argos3D -
P33x sets the pixel distance to the minimum value. The threshold is set via register
ConfidenceThresHigh
.
•
Invalid pixels: The Argos3D - P33x features an additional amplitude check called ACF (auto correlation
function) Plausibility Check. It detects inconsistent pixels e.g. in case of fast movement in the scene.
4.4.1.1
Distance values
If the amplitude of the reflected signal is below a threshold (underexposure) the distance value of the
appropriate pixel will be set to 0xFFFF. If the amplitude is too high (overexposure) the distance value will be set
to 0x0000.
For invalid pixels, the distance value is set to 0x0001.
4.4.1.2
XYZ values
If the amplitude of the reflected signal is below a threshold (underexposure) the X value of the appropriate pixel
is set to 32767 (0x7FFF), i.e., the largest positive Int16 value. Y and Z values are set to 0.
If the amplitude of the reflected signal is above a threshold (overexposure) the X of the appropriate pixel is set to
0. Y and Z values are set to 0 as well.
If the ACF plausibility check classified the pixel’s distance as invali
d, the X value of the appropriate pixel is set to 1.
Y and Z values are set to 0.