User`s manual

STOC USER’S MANUAL ©2005 VIDERE DESIGN
7 User Controls
The CMOS imagers are fully controllable via the 1394 interface. User
programs may input color images (STOC-C only), set video digitization
parameters (exposure, gain, red and blue balance), and subsampling modes.
All of these parameters can be set with the SRI Small Vision System. They
are also accessible to user programs through the capture API (Section
8).
User controls for frame size and sampling modes are on the main capture
window dialog. Video digitization controls are accessed through a dialog
invoked with the Video… menu item.
Figure 7-1 shows the dialog.
7.1 Submode
The submode specifies what video streams are output by the STOC. There
is an API call in SVS to set the submode directly – see the SVS Users’
Manual. In smallv, the submode is set indirectly, by the Function and Warp
inputs. The default submode, left rectified image and disparity image, is set
by using Function->Stereo and turning Warp on. By default, this is done
when the STOC is first opened. Setting Function->None turns off stereo
processing, and outputs the right rectified image in place of the disparity
image. Turning off Warp will output both original images.
Table 5
summarizes these settings. Note that it is not possible to invoke the Test
Submode from smallv.
7.2 Color
Color information from the stereo digital head (STOC-C only) is input as
raw colorized pixels, and converted by the interface library into an RGB
color channel. The primary color channel corresponds to the left image,
which is the reference image for stereo. The right image color channel is
not available. The color images will be de-warped to take into account lens
distortion, and are aligned with the disparity image.
Color information from the camera is input only if the Color button is
pressed on the main window (
Figure 2-1).
Because the typical color camera uses a colorizing filter on top of its pixels,
the color information is sampled at a lower resolution than a similar non-
colorized camera samples monochrome information. In general, a color
camera has about ¼ the spatial resolution of a similar monochrome camera.
The relative amounts of the three colors, red/green/blue, affects the
appearance of the color image. Many color CCD imagers have attached
processors that automatically balance the offsets among these colors, to
Figure 7-1 Video Parameters dialog.
Functio
n
War
p
Submode
None Off LO, RO
None On LR, RR
Stereo On LR, DP
Stereo Off Not
available
Table 5 Submodes invoked by settings in smallv.
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