OmniTek OTR 1001 User Guide, v3.1a
E-4
E.3 Waveform View
(Not available in PQA Mode)
The Waveform View
offers high resolution displays of the video’s YCbCr / RGB components.
Arbitrary combinations of colour components may be displayed simultaneously, optionally
together with a composite waveform derived from the luma and chroma data within the original
video stream (see below). Waveforms may optionally be overlaid with a graticule calibrated in
ms along the (horizontal) timing axis and giving either digital values, percentage IRE or
millivolts along the vertical voltage axis. The labels shown below are also optional. For RGB
and YUV, two separate waveform calibrations are offered: SMPTE range (decimal 64 –
940/960) or Full Range 0 – 1023 (Full Range is always used when working with XYZ),
Waveforms can be shown either for a single line (the line currently selected by the crosshair
cursor) or for all the lines in the current frame/in the current Region of Interest where this is
enabled (see above). If required, the waveform can be shown offset from either axis of the
graticule or the whole pattern shifted up or down, left or right by applying the appropriate offset
– see ‘Lock Waveform Graticule’ below.
Waveforms may further be adjusted for gamma and other corrections that may have been applied
to the video source. Gamma may be either applied or removed as required, while other linear, log
or custom adjustments applied to RGB or XYZ waveforms can be handled through the
application of the appropriate look-up table (LUT). The Reference White Level used in
converting between RGB and XYZ may also be set to the required value.
Notes:
(i) Custom lookup tables should be in CSV (comma separated variable) format. LUTs are
included for Sony SR and Thomson Viper cameras, which can be modified to create complete
custom LUTs. The supplied LUTs are located in
c: Program Files\OmniTek\DataLab\LUTs
(ii) Where the VIEW_3D option is installed, the Waveform View can also be used to compare
luma and chroma levels between left-eye and right-eye Stereo 3D video images or between a
reference image and a test image (see Section I.8). The latter option is also available where the
ALIGNMENT option is installed.
Figure E-4:
Example waveform display.
Control is offered over several aspects of the waveform display, including:
Which colour components are displayed, the colour(s) they are displayed in and how they
are arranged (in parade form; stacked or overlaid).
The line/lines of the video that are analysed together (selected through a combination of
the position of the crosshair cursor, the line mode and the sweep mode).
The horizontal magnification and vertical gain that are applied.
The OTR 1001 also offers the option of filtering/ interpolating the waveform.
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