Transformations and Viewing
Operations
1
Transformation
Transformation operations are usually involved in modeling
objects (points, lines, 3D models) in CAD
2
Cartesian Coordinate
- 2D space in Cartes
3D Reconstruction
1
3D Reconstruction
Problem
Given xixi
Compute P, P and Xi such that
x i = PX i
xi = PXi
Reconstruction method
Compute F from correspondences
2. Compute camera matrices from F
3.
Motion Analysis
1
Motion Related Problems
Motion detection
Registers any detected motion
For security
Single camera
Moving object detection and location
Relative motion between object and camera
Image Processing
1
Image
Processing
Operation
Original
Increased contrast
Change in Hue
Posturized
Blurred
2
Rotated
Image Processing
Image Processing
Processing of a 2D picture by a computer
Image e
Two View Geometry
1
Structure
(i)
Correspondence geometry: Given an image point x in
the first view, how does this constrain the position of the
corresponding point x in the second image?
(ii) Camera
Image Formation
1
Image Formation
Discrete color
Intensity
2
Reflection and Shading
Light scattered and reflected when it hits an objects surface
objects
Bidirectional reflectance distribution functio
Camera Calibration
1
Introduction
Estimating the camera projection matrix
Xi x i
P?
Computation of camera matrix is known as resectioning
From sufficient corresponding world and image lines
2
Basic
Camera Models
1
Finite Cameras
Camera is a mapping between 3D world and a 2D image
Basic pinhole model
Euclidean coordinate system (a general space defined by 3 axes)
Projection of points in the s
MAEG 5720
Computer Vision in Practice
Lecturer: Dr.YM Tang
Email: [email protected]
1
Assessment Scheme
Projects
Tests
T t
Final examination
2
Course Outline
Computer vision
Transformations and vi
Segmentation
1
Segmentation
Finding shape and size of image object
Important in the analysis of image data
Thresholding
Segment object and background
It is the transformation of an image f to an