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Generic Geometric Transformations

Perform generic geometric transformations using the imwarp workflow

Use these functions to perform general 2-D and N-D geometric transformations. Use the geometric transformation classes to define the transformation and then use imwarp to apply the transformation to an image.

Functions

imwarpApply geometric transformation to image
findboundsFind output bounds for spatial transformation
fliptformFlip input and output roles of spatial transformation structure
makeresamplerCreate resampling structure
maketformCreate spatial transformation structure (TFORM)
tformarrayApply spatial transformation to N-D array
tformfwdApply forward spatial transformation
tforminvApply inverse spatial transformation

Using Objects

WarperApply same geometric transformation to many images efficiently
imref2d Reference 2-D image to world coordinates
imref3d Reference 3-D image to world coordinates
affine2d2-D affine geometric transformation
affine3d 3-D affine geometric transformation
projective2d 2-D projective geometric transformation
PiecewiseLinearTransformation2D2-D piecewise linear geometric transformation
PolynomialTransformation2D2-D polynomial geometric transformation
LocalWeightedMeanTransformation2D 2-D local weighted mean geometric transformation

Topics

Matrix Representation of Geometric Transformations

Affine and projective transformations are represented by matrices. You can use matrix operations to perform a global transformation of an image.

2-D and 3-D Geometric Transformation Process Overview

To perform a general geometric transformation of a 2-D or 3-D image, first define the parameters of the transformation, then warp the image.

N-Dimensional Spatial Transformations

You can create custom geometric transformations to process images of arbitrary dimension, or to change the dimensionality of the output image from the input image.

Perform Simple 2-D Translation Transformation

This example shows how to shift an image vertically and horizontally. Use spatial referencing information to display the original image and the translated image from the same perspective.

Image Coordinate Systems

Learn how image locations are expressed using pixel indices and spatial coordinates.

Specify Fill Values in Geometric Transformation Output

This example shows how to specify the color of blank space in the image after a geometric transformation.

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