Graphic Type Attribute
| Tag | (0070,0023) |
|---|---|
| Type | Required (1) |
| Keyword | GraphicType |
| Value Multiplicity | 1 |
| Value Representation | Code String (CS) |
If and only if Value Type (0040,A040) is SCOORD:
See Section C.18.6.1.2 for Enumerated Values.
If and only if Value Type (0040,A040) is SCOORD3D:
See Section C.18.9.1.2 for Enumerated Values.
Section C.18.6.1.2
C.18.6.1.2 Graphic Type
When annotation applies to an image, this Attribute defines the type of geometry of the annotated region of interest.
Enumerated Values:
- POINT
-
a single pixel denoted by a single (column,row) pair
- MULTIPOINT
-
multiple pixels each denoted by an (column,row) pair
- POLYLINE
-
a series of connected line segments with ordered vertices denoted by (column,row) pairs; if the first and last vertices are the same it is a closed polygon
- CIRCLE
-
a circle defined by two (column,row) pairs. The first point is the central pixel. The second point is a pixel on the perimeter of the circle.
- ELLIPSE
-
an ellipse defined by four pixel (column,row) pairs, the first two points specifying the endpoints of the major axis and the second two points specifying the endpoints of the minor axis of an ellipse
Note
-
The order of encoding of successive points for any particular Graphic Type is significant, but its meaning is not specified. The meaning of the order may be defined by a particular Template that uses them. For example, a closed POLYLINE may be encoded with a clockwise (right) or counter-clockwise (left) winding order (when viewed from a specified direction). A two-point POLYLINE used to encode a vector with a direction might be expected to originate at the first encoded point and be directed towards the second encoded point, but that is not specified.
-
A Polygon encoded as a POLYLINE is not restricted to being a simple polygon, unless so specified by the Template that uses it.
Section C.18.9.1.2
C.18.9.1.2 Graphic Type
This Attribute defines the type of geometry of the region of interest.
Enumerated Values:
- POINT
-
a single location denoted by a single (x,y,z) triplet
- MULTIPOINT
-
multiple locations each denoted by an (x,y,z) triplet; the points need not be coplanar
- POLYLINE
-
a series of connected line segments with ordered vertices denoted by (x,y,z) triplets; the points need not be coplanar
- POLYGON
-
a series of connected line segments with ordered vertices denoted by (x,y,z) triplets, where the first and last vertices shall be the same forming a polygon; the points shall be coplanar
- ELLIPSE
-
an ellipse defined by four (x,y,z) triplets, the first two triplets specifying the endpoints of the major axis and the second two triplets specifying the endpoints of the minor axis
- ELLIPSOID
-
a three-dimensional geometric surface whose plane sections are either ellipses or circles and contains three intersecting orthogonal axes, "a", "b", and "c"; the ellipsoid is defined by six (x,y,z) triplets, the first and second triplets specifying the endpoints of axis "a", the third and fourth triplets specifying the endpoints of axis "b", and the fifth and sixth triplets specifying the endpoints of axis "c"
Note
-
A circle is a special case of ELLIPSE where the major and minor axis points are equidistant from the center.
-
Coplanar is in the mathematical sense and is not necessarily related to a specific Image Instance.
-
The order of encoding of successive points for any particular Graphic Type is significant, but its meaning is not specified. The meaning of the order may be defined by a particular Template that uses them. For example, a closed POLYGON may be encoded with a clockwise (right) or counter-clockwise (left) winding order (when viewed from a specified direction). A two-point POLYLINE used to encode a vector with a direction might be expected to originate at the first encoded point and be directed towards the second encoded point, but that is not specified.
-
A POLYGON is not restricted to being a simple polygon, unless so specified by the Template that uses it.