Systemy wizyjne
Vision systems
Laboratory 1
High speed camera test stand
ISSUES:
1. Camera technical parameters, camera usage, record modes & settings ,
- rate vs. exposure, aperture vs. exposure, acquisition settings (record modes)
Lecturer: Piotr Kohut, PhD eng. Date: Grade
Students' names:
1.
2.
3.
Idea of test stand
Idea of this test stand is to record an object in
motion. Then using a proper software analyse
this images and gain data (position x,y,z and
orientation yaw,pitch,roll) describing motion of this
object is 3D space.
Test stand procedure
Test stand procedure is divided into 3 main parts:
ð Lab_1_Image aquisition  using Motion Studio
ð Lab_2_Camera calibration  using GML Camera
Toolbox
ð Lab_3_Image analysis, trajectory tracking,
displaying results  using Tema software
Test stand
ð A model to track, with
quadrant markers placed
at known positions
ð A scene - uniform
background for a model
ð Camera recording 3
marked walls of the
model
ð Lighting - as close to the
model as possible and
aproximately along the
axis of camera
Motion Studio
ð Main feature  acquisition of the sequence
of images recorded by the high-speed
camera
ð Setting the parameters of recording, such
as frequency rate, exposure time, region of
interest
ð Simple image processing, filters.
ð Internal or external trigger
Motion Studio
3. Acquisition
1. Open 2. Camera 4. Set
settings -
camera control - Live aperture
Camera
8. Acquisition
5. Set rate and 6. Position the 7. Adjust the
settings 
exposure model focus
Record
9. Camera
10. Save
control -
acquisition
playback
Motion Studio
1. Open camera. Select all the available types of cameras.
1. Open
camera
2. Camera
control - Live
Motion Studio
Choose the X-Stream XS3 camera, USB 2.0
1. Open
camera
2. Camera
control - Live
Motion Studio
2. Camera control - Live
" Rec - switches record mode on. However, it does not
starts acquiring
" Trigger - while in record mode, sets the moment of
1. Open
camera
acquisition
" Live - sends live preview from the camera onto the
screen, but not records images
2. Camera
control - Live
" Stop
Now, choose Live mode.
3. Acquisition
settings -
Camera
Experimental Tests_1
ð Camera control - Live
Motion Studio
3. Acquisition settings - Camera
ð Rate - number of frames per second.
ð Exposure - time of acquisition of a single
2. Camera
frame in microseconds. It can be adjusted
control - Live
by the buttons -1/2f and 1/2f.
Maximum time is determined by set Rate.
The higher rate, the lower maximum
3. Acquisition exposure time. Longer exposure provides
settings -
more light and brighter image; shorter -
Camera
darker image.
ð Low light mode ( ) - Temporarily sets
Rate to 25Hz and exposure to four times the
4. Set
current value. It is useful for preview in low-
aperture
light conditions.
ð ROI - region of interest - Sets the area of
frames, we want to acquire. Maximum is
1280x1024. Number of lines determines the
maximum Rate. For largest ROI, maximum
rate is 610Hz
Motion Studio
ROI - region of interest
Sets the area of
2. Camera frames, we want to
control - Live
acquire. Maximum is
1280x1024. Number
3. Acquisition
settings -
of lines determines
Camera
the maximum Rate.
4. Set
For largest ROI,
aperture
maximum rate is
610Hz
Experimental test_2
ð Rate &
ð ROI& .
Motion Studio
4. Adjusting aperture
ð Should be relatively high
3. Acquisition to provide high depth of
settings -
field and ensure that all
Camera
markers will be tracked
properly
4. Set
aperture
ð On the other hand
higher aperture reduces
5. Set rate amount of light and
and exposure
longer exposure time
has to be set
ð Set the value from 4 to 8
Motion Studio
5. Choosing appropriate rate and exposure
For high precision of tracking a movement, it is
good to provide as high rate as possible. However,
4. Set
you have to provide enough light. Because of this,
aperture
set maximum exposure for given rate.
5. Set rate
and exposure
6. Position the
Appropriate
model
amount of light
Motion Studio
Too much light Too little light:
4. Set
aperture
5. Set rate
and exposure
6. Position the
model
Experimental test_3
ð Aperture
ð Exposure
Motion Studio
6. Positioning of a model:
ð Model should occupy major part in the centre of a frame.
ð All three walls should be equally, well visible. The closer to
perpendicular they are, the more reliable tracking is. Three markers,
which are most difficult to be tracked properly are marked on the
image:
5. Set rate
and exposure
6. Position
the model
7. Adjust the
focus
Motion Studio
7. Adjusting the focus
ð After positioning of a model, the focus
6. Position
has to be adjusted on the lens of the
the model
camera. It has to be set so, that
7. Adjust the
images of all the markers: the closest
focus
to the camera, as well as furthest
8. Acquisition
ones, has to be equally sharp.
settings 
Record
ð ATTENTION! Focus cannot be
changed between acquiring the
sequence and calibration!
Motion Studio
Well focused image
Bad focused image
6. Position
the model
7. Adjust the
focus
8. Acquisition
settings 
Record
Experimental test4
ð Focus
Motion Studio
8.Acquisition settings  Record
Record mode:
7. Adjust the
ð Normal - the camera acquires and
focus
stops when assumed number of
frames was recorded
8. Acquisition
ð Circular - enables to acquire
settings 
Record
frames which occurred before and
after "Trigger" button. Length of pre-
and post-trigger can be adjusted by
9. Camera
control -
Trigger Adjust
playback
ð BROC (Burst Record on
Command) - enables to acquire
several sequences in one record,
each at the time of trigger.
Motion Studio
Record and trigger
Choose circular
mode, set the
7. Adjust the
focus
number of frames to
obtain sequence of
8. Acquisition
settings 
length 0.5s - 1s, set
Record
pre-trigger to, e.g.
9. Camera
25% of length.
control -
playback
Motion Studio
9. Camera control -
playback
8. Acquisition
settings 
Record
A sequence after
9. Camera
control -
acquisition can be
playback
played with a Play
10. Save
button. The speed can
acquisition
be adjusted with a
slider
Motion Studio
10. Saving acquisition
Use "Save Acquisition" button (marked with red rectangle).
You can choose folder, name for files and format.
9. Camera
control -
playback
10. Save
acquisition
Experimental test5
ð Recording modes