Perspective Transformation along specific axes

Animation

Rotate along X axis and translate 5 pixel along X axis

Rotate along XZ axis

Prerequisites

• Linux
• Python 2.7 with numpy
• OpenCV 2.4.9

Usage

Change main function with ideal arguments

python demo.py [path of the image] [degree to rotate] ([ideal width] [ideal height])

e.g., Example of rotating an image along yz-axis from 0 to 360 degree with a 5 pixel shift in +X direction

- rotated_img = it.rotate_along_axis(phi = ang, dx = 5)
+ #rotated_img = it.rotate_along_axis(phi = ang, dx = 5)

- #rotated_img = it.rotate_along_axis(phi = ang, gamma = ang)
+ rotated_img = it.rotate_along_axis(phi = ang, gamma = ang)

Then

python demo.py images/000001.jpg 360

Parameters:

it = ImageTransformer(img_path, img_shape)
it.rotate_along_axis(theta=0, phi=0, gamma=0, dx=0, dy=0, dz=0):

• img_path : the path of image that you want rotated
• shape : the ideal shape of input image, None for original size.
• phi : the rotation around the y axis
• gamma : the rotation around the z axis (basically a 2D rotation)
• dx : translation along the x axis
• dy : translation along the y axis
• dz : translation along the z axis (distance to the image)

Acknowledgments

Code ported and modified from jepson and stackoverflow. Thanks for their excellent work!

Author

Hou-Ning Hu / @eborboihuc