CS654: Digital Image Analysis Lecture 6: Basic Transformations.

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Presentation transcript:

CS654: Digital Image Analysis Lecture 6: Basic Transformations

Recap of Lecture 5 Different distance measures D4, D8,Dm, Euclidean Application of distance transform Shape matching Arithmetic and logical operations on images Combining images

Today’s outline Basic mathematical transformations in 2-D and 3-D Translation Rotation Scaling Inverse transformation Perspective projection Cartesian and homogeneous co-ordinate system

Basic transformations in 2-D Translation Rotation Scaling Concatenate transformations Transformation about an arbitrary point

Rotation about a point other than the Origin 1. Translate the object so that the point of translation is moved to the origin 2.Rotate the relocated object as normal around the origin 3.Undo the translation in Step 1 to return the newly rotated object to its new rotated location. Find the new end points of the line segment which connects the points (1,1) to (3,3) when it is rotated anti-clockwise about the point (1,1) through an angle of π/2.

Basic transformation in 3D: Translation Translation Scaling Rotation About z-axisAbout x-axisAbout z-axis

Commutative and non-commutative transformation Non-Commutative Non-uniform scale, rotate Translate – scale Rotate - translate Commutative Translate – translate Scale – scale Rotate – rotate Uniform scaling – rotate

Inverse transformation

Perspective transformation P(X,Y,Z) P I (x,y) Z Y X World co-ordinate Image co-ordinate Given (X,Y,Z) and focal length of the camera can we determine the camera coordinate system?

Relation between camera coordinate and world coordinate Using similar triangle concept compute the relation between world coordinate and camera coordinate

Homogeneous coordinate system

Thank you Next Lecture: Camera Model and Imaging Geometry