Which of the following statements is/are incorrect Mapping the co-ordinates
2015
Which of the following statements is/are incorrect ?
(a) 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 transformation
(b) The right-handed cartesian co-ordinates system in whose co-ordinates we describe the picture is known as world co-ordinate system
(c) The co-ordinate system that corresponds to the device or workstation where the image is to be displayed is known as physical device co-ordinate system
(d) Left-handed co-ordinate system in which the display area of the virtual display device corresponds to the unit (∣𝑥∣) square whose lower left-hand corner is at the origin of the co-ordinate system, is known as normalized device co-ordinate system
Codes :
- A.
(a) only
- B.
(a) and (b)
- C.
(c) only
- D.
(d) only
Attempted by 101 students.
Show answer & explanation
Correct answer: D
Answer: Only the statement that describes the normalized device coordinate system as left-handed and as using a '(|x|) square' is incorrect.
Explanation of each statement:
Mapping the coordinates of the points and lines that form the picture into the appropriate coordinates on the device or workstation is known as viewing transformation — Correct. Viewing transformation refers to converting the picture from its modeled coordinates into coordinates appropriate for display (this commonly includes viewport/device mapping or is treated as part of the viewing pipeline).
The right-handed Cartesian coordinate system in whose coordinates we describe the picture is known as the world coordinate system — Correct. The world coordinate system is the reference coordinate space used to define object geometry.
The coordinate system that corresponds to the device or workstation where the image is to be displayed is known as the physical device coordinate system — Correct. This refers to device-specific coordinates (for example pixel coordinates) on the output device.
Left-handed coordinate system in which the display area of the virtual display device corresponds to the unit '(|x|) square' whose lower left-hand corner is at the origin is known as normalized device coordinate system — Incorrect. Normalized device coordinates (NDC) map the display area to a canonical unit region (commonly x and y normalized to the 0..1 interval in many 2D conventions, or to -1..1 in some graphics APIs). The statement's claim about left-handedness is misleading because handedness depends on convention/API, and the phrase '(|x|) square' is unclear and incorrect.
Therefore the only incorrect statement is the one that mischaracterizes the normalized device coordinate system.