Region of Interest toolbar
The Region of Interest toolbar acts in conjunction with the Waveform and Vector Scope windows to provide fine detail control over the part of the video frame that is used to create waveforms etc. Many of controls can also be achieved by other means but some
The details of the section of the video frame picked out for display are set through the Horizontal and Vertical controls that form the major part of the ROI window display (described below).
The Region of Interest controls are global in that they have a parallel effect on the waveforms, the Vector Scope view, and any histograms. The Data View display, however, is unaffected by these controls, as it always shows the incoming data around the current crosshair position.
Line mode
The top control is crucial. It lets you select between displaying the waveform of a single line, a waveform based on multiple lines (the Multi option), and a Sweep mode in which an arbitrary number of lines can be displayed.
This control is also available by clicking on the Line Mode icon on the Windows toolbar.
Horizontal/Vertical
The horizontal and vertical controls allow you to identify a specific area of interest within the video frame, and to set the scaling that is applied. These items can be variously set by moving sliders, moving counters to particular values, or clicking on buttons within the toolbar that select certain specific values. Further details are given below.
Horizontal position (Multi and Line modes only)
The default waveform position has pixel 1 at the left of the display, and the last active pixel on the right of the display. In Line and Multi mode, it is possible to scroll the view of the waveform using the H pos slider. This
provides a useful means of examining blanking data. Additionally, it is possible to focus in on the section of the waveform around the selected point of interest by magnifying the image using either the H mag slider or numeric data entry, or by clicking on the provided ‘x10’, ‘x5’ or ‘x2’ buttons.
A full single line (including the blanking area) may be displayed by using the ‘1L’ button, while the waveform associated with two full lines can be displayed by clicking the ‘2L’ button. (This ‘2L’ display is chiefly of value in Line mode.)
Vertical (line) position
It is similarly possible to select a vertical portion of the video image from which to create waveforms, using the Y controls.
In Multi mode, the line at the centre of the region of interest is set using the Y pos slider/counter, while the number of lines around that line from which the waveform is to be generated is set using the Y range slider/counter. (The buttons allow quick selection of the first and last lines of each field.)
OmniTek XR User Guide, Software Release 2.3 | Page 63 |
