Transform

Applies linear transformations to an image, such as scaling, rotation, skewing, or warping, altering its shape or orientation.

🖼️ Image options and parameters of transform method

transform method uses transformation matrix to rotate, translate, and/or scale the image. User needs to pass on the matrix that will be applied to the image. Matrix must have either 2 rows and 3 columns or 3 rows and 3 columns:

$$\begin{bmatrix} a & b & c\\ d & e & f \\ g & h & i \end{bmatrix}$$

If 2x3 matrix is passed, the algorithm will consider it as affine transformation so last row will be set as [0,0,1];

• the first a and e are responsible for image scaling
• b and d are responsible for shear. Combination of these 4 variables allows rotating. c and f are responsible for image translation.
• g and h are used for an operation called projection. It allows changing image perspective.
• i is a normalization factor. It acts like a "scaling factor" for the entire coordinate system. Think of it as a zoom lens setting.

For more information take a look at the tutorial about image transformations

note

transform() function can accept 2x3 as well as 3x3 matrix. If matrix's size is 2x3 that it becomes an affine transformation. This means that transformation happens on the same

caution

Matrix cannot be singular. Otherwise it cannot be inverted. Click here to learn more.

Source:LennaBarbaraStandard boatMandrillPeppersHouse

Ran in 0.00μs (Infinity ops/s)

Kinds of images compatible with algorithm

Image property	What it means	Possible values
bitDepth	number of bits per channel	[8,16]
components	number of components	any
alpha	is alpha channel allowed	true

Parameters and its default values

• transformMatrix

• options

Options

Property	Required	Default value
borderType	no	constant
borderValue	no	0
fullImage	no	-
height	no	-
interpolationType	no	bilinear
inverse	no	-
width	no	-