Class: PerspectiveTransformAugmenter

PerspectiveTransformAugmenter(sigma)

Applies a random four-point perspective transform to the image (kinda like an advanced form of cropping). Each point has a random distance from the image corner, derived from a normal distribution with sigma sigma.

Warning : this is only working with opencv4nodejs backend

Constructor

new PerspectiveTransformAugmenter(sigma)

Parameters:
Name Type Description
sigma Object

options

Properties
Name Type Attributes Default Description
sigma NumberArgument

the sigma of the normal distribution
keepSize BooleanArgument

If keepSize is set to True (default), each image will be resized back to its original size.
borderValue ColorArgument <optional>
 [0,0,0]

if borderType is "constant" this is used as border pixel values
borderType BorderTypeArgument <optional>
 "constant"

can be "constant", "replicate", "transparent"
cornersVariation Array.<Array.<Number>> <optional>
 null

if set, sigma is not used. For more deterministic behavior, use this to set manually the percent (x,y) variation of each corner
Source:
Examples
// Simple usage, perspective transform on a sigma=10% random perspective tarnsform
ia.perspectiveTransform(0.1);
// Now replicate the borders
ia.perspectiveTransform({
	sigma: 0.1,
	borderType: "replicate"
});