Peihong Guo's CSCE 646 Projects

Operations supported:

Operation	Command format	Example
Scaling	s sx sy	Scaling by 0.5 in x direction and 0.75 in y direction: s 0.5 0.75
Translation	t tx ty	Translation by 32 in x direction and 64 in y direction: t 32 64
Rotation	r deg	Rotation by 45 degree counter clockwise: r 45
Shear	sh shx shy	Shear transformation with 0.5 in x direction and 0.25 in y direction: sh 0.5 0.25
Mirror	m axis	Mirror along x axis: m x Note: axis can only be x or y
Perspective	p px py	Perspective transformation with vanishing point at (1.0/a,0) and (0, 1.0/b): p a b
Bilinear	b x0 y0 x1 y1 x2 y2 x3 y3	Bilinear transformation with 4 corners(top left, bottom left, top right, bottom right) at (0, 0), (256, 16), (32, 200), (200, 168): b 0 0 256 16 32 200 200 168
Composition	cbegin op1 params op2 params ... cend	cbegin s 0.5 1.5 t 32 64 sh 0.1 0.2 p 0.001 0.002 cend
Swirl	sw degree	Swirl with 90 degree: sw 90
Iteractive Warping	Switch to interactive mode by choosing grid based interactive transformation or moving least square. Enter the grid size. By default, a 1x1 grid is used, and bilinear warping is performed. Grid-based warping is performed if a larger grid is used. Basic operations: Press 'c' to show/hide control points; Press 'g' to show/hide grids; Drag around the control points to deform the image.	Please see the video below for details. For speed consideration, please use Chrome browser ONLY for the interactive warping, and use forward mapping when image quality is not a main concern.