Engee documentation

ImageTransformations.jl

Introduction

Image Transformation is the process of changing the coordinate system of an image by resizing, rotating, etc. These operations have various applications, e.g, medical image registration.

Installation

(v1.0) pkg> add ImageTransformations

Key functions

The exported functions in this package include

  • restrict for 2-fold down sampling

  • imresize for arbitrary resizing

  • imrotate for image rotation

  • warp for general image warping, and related functions

    • WarpedView

    • warpedview

    • InvWarpedView

    • invwarpedview

These functions all have docstrings that give more details about their usage.

There are in-place version of many of the functions, e.g., imresize! etc.

Examples

  • Resize

using ImageTransformations, TestImages
img = testimage("mandrill")
img_small = imresize(img, ratio=1/8)
img_medium = imresize(img_small, size(img_small).*2)

Resulting images (small and medium): img_small img_medium

  • Warping

using ImageTransformations, TestImages, CoordinateTransformations, Rotations

img = testimage("camera");

# define transformation
trfm = recenter(RotMatrix(pi/8), center(img));
imgw = warp(img, trfm);

Resulting image: img_warp