Colour Modes
OmniTek XR can display the waveforms in a variety of modes, which may be selected either from the Colour mode drop down in the panel or from the Colour mode menu. The possible modes are:
YCbCr | Displays video in the original format as per the serial input |
YUV (SD) | Displays video on graticules that match regular SD data |
YCbCr + Composite | As YCbCr but also showing a composite waveform created |
| from the component data (see below) |
YUV + Composite (SD) | As YUV (SD) but also including the composite waveform, |
| created as above |
Y + RGB | Shows luma plus the RGB component data |
RGB | Standard RGB display |
RGB + Composite | RGB display together with a composite waveform created |
| from the component data (see below) |
Composite | Only shows the composite waveform |
Bowtie | Shows a standard Bowtie display |
In all modes, selector boxes appear for each item included in the waveform display, so that items not required need not be shown. The remaining items automatically stretch to fill the space when an item is removed. The waveforms can all be displayed as full width, with each different component stacked vertically, or in a standard parade form (selectable via the separate Parade option).
Composite display
Where the colour mode specifies ‘Composite’, the waveforms shown include one showing the Composite waveform corresponding to the luma and chroma data within the original video datastream.
The composite waveform takes the form of a band of varying width around a central line that follows the Y (luma) component of video data. The width of the band at any point of the waveform is determined by the chroma components of the waveform, the magnitude and phase of which determine an overall magnitude (M) for the colour component of the signal. The outer limits of the composite waveform are given by Y + M and Y – M.
In the OmniTek XR display, the area between the Y + M and Y – M curves is filled in with solid colour as there is no useful information to be obtained from this area.
The range of values between which the composite waveform runs is one of the aspects of the video that OmniTek XR monitors. In particular, it monitors where these values go outside the permitted range set on the Video: Analyzer page of the Engineering Settings control window (see page 23). The proportion of the incoming video for which the composite signal goes outside the specified range is reported on in the Video Status window (see page 84) and logged in the Event Log window (see page 104).
Panel Controls
Colour mode
These controls allow the selection of the components to display, either stacked vertically or in parade form.
Look & Feel
The ‘Look & Feel’ controls are provided to fine tune the gain, gamma curve and decay of the waveform traces. However these controls are not normally used as these aspects of the display are automatically adjusted to suit variable levels of gain etc.
Page 58 | OmniTek XR User Guide, Software Release 2.3 |
