HD9690 Series HDTV Graticule Generator Manual
OVERVIEW
Revision 1.5
Page 1-7
SMPTE ST 2046-1:2009:
The new SMPTE Standard for Specifications for Safe Action and Safe Title
Areas for Television Systems. These Current safe area specifications are based on fixed pixel
matrix displays and are significantly larger than those specified in RP218,
SMPTE RP 2046-2:2009:
The new SMPTE Recommended Practice specifying Safe Areas for
Protection of Alternate Aspect Ratios. This practice specifies safe areas that should be used
when composing 16:9 images that will be presented on both 4:3 and 16:9 aspect ratio displays.
The choice of whether the image, having been captured in one aspect ratio, should be cropped
for presentation in the other is dictated by creative and business factors. This Practice is
intended to offer guidance on how best to compose the image once the presentation decision
has been made
1.2.1. Graticule Generator Terminology/Definitions
CENTRE OF IMAGE
The centre of an image is defined as the centre of the clean aperture. Horizontally
there will be an equal number of pixels within the clean aperture to the left and right of the
centre point. Vertically there will be an equal number of lines within the clean aperture above
and below the centre point.
CLEAN APERTURE
Is a subset region of the production aperture, which is concentric with the production
aperture. The clean aperture is substantially free from transient effects due to blanking and
picture processing.
EDGE PROCESSING REGION
The region of the production aperture that lies outside the clean
aperture. Blanking transitions should occur completely within the edge-processing region.
IMAGE ASPECT RATIO
Defines the ratio of the horizontal dimension to the vertical dimension of the
production aperture when displayed according to the specifications of the video standard. For
HDTV images the image aspect ratio is 16:9.
IMAGE LATTICE
A two-dimensional array of pixels.
OBJECT
This is the object that is generated by the Graticule Generator and keyed into the video output.
The Graticule Generator can generate the following objects: 1 grid consisting of a pair of
horizontal lines and a pair of vertical lines, hard matte box, 2 cross markers, 2 boxes, and 1
ellipse.
OBJECT ASPECT RATIO
Defines the ratio of the horizontal dimension to the vertical dimension of the
graticule object keyed into an image, when the image is displayed at its defined aspect ratio.
OBJECT PARAMETER
Each object has a set of parameters appropriate for the object. These
parameters control the appearance, position and behaviour of the object on the screen. Some
object parameters are mutually exclusive with others, so the menu structure intelligently shows
only the object parameters that are available in the current mode.
OSD
On Screen Display. This display can be ovelayed on top of the video to view the object
attributes of the controlled object.
ENABLED OBJECT
An enabled object is one that is currently keyed into the video output.
