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normalized device co-ordinate system Normalized device coordinates (NDCs) make up a coordinate system that describes positions on a virtual plotting device. The lower left corner corresponds to (0,0), and the upper right corner corresponds to (1,1).
NDCs can be used when you want to position text, lines, markers, or polygons anywhere on the plotting device (that may or may not already contain a plot).
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An image is stored in the memory of the computer in a Cartesian coordinate system typically known as World Coordinate System.
When the same picture is seen in a display device it is displayed in physical device coordinate system.
Mapping the co-ordinates of the points and lines that form the picture into the appropriate co-ordinates on the device or workstation is known as viewing transformatio