org.datavec.image.transform

Class WarpImageTransform

java.lang.Object

org.datavec.image.transform.BaseImageTransform<org.bytedeco.opencv.opencv_core.Mat>

org.datavec.image.transform.WarpImageTransform

All Implemented Interfaces:

ImageTransform

public class WarpImageTransform
extends BaseImageTransform<org.bytedeco.opencv.opencv_core.Mat>

Warps the perspective of images deterministically or randomly. Calls opencv_imgproc.warpPerspective(Mat, Mat, Mat, Size, int, int, Scalar) with given properties (interMode, borderMode, and borderValue).

Author:

saudet

Field Summary

Fields inherited from class org.datavec.image.transform.BaseImageTransform

converter, currentImage, random

Constructor Summary

Constructors

Constructor and Description
WarpImageTransform(float delta) Calls this(null, delta, delta, delta, delta, delta, delta, delta, delta).
WarpImageTransform(float dx1, float dy1, float dx2, float dy2, float dx3, float dy3, float dx4, float dy4) Calls this(null, dx1, dy1, dx2, dy2, dx3, dy3, dx4, dy4).
WarpImageTransform(Random random, float delta) Calls this(random, delta, delta, delta, delta, delta, delta, delta, delta).
WarpImageTransform(Random random, float dx1, float dy1, float dx2, float dy2, float dx3, float dy3, float dx4, float dy4) Constructs an instance of the ImageTransform.

Method Summary

Modifier and Type	Method and Description
protected ImageWritable	doTransform(ImageWritable image, Random random) Takes an image and returns a transformed image.
float[]	query(float... coordinates) Transforms the given coordinates using the parameters that were used to transform the last image.

Methods inherited from class org.datavec.image.transform.BaseImageTransform

getCurrentImage, transform, transform

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

WarpImageTransform

public WarpImageTransform(float delta)

Calls this(null, delta, delta, delta, delta, delta, delta, delta, delta).

WarpImageTransform

public WarpImageTransform(Random random,
                          float delta)

Calls this(random, delta, delta, delta, delta, delta, delta, delta, delta).

WarpImageTransform

public WarpImageTransform(float dx1,
                          float dy1,
                          float dx2,
                          float dy2,
                          float dx3,
                          float dy3,
                          float dx4,
                          float dy4)

Calls this(null, dx1, dy1, dx2, dy2, dx3, dy3, dx4, dy4).

WarpImageTransform

public WarpImageTransform(Random random,
                          float dx1,
                          float dy1,
                          float dx2,
                          float dy2,
                          float dx3,
                          float dy3,
                          float dx4,
                          float dy4)

Constructs an instance of the ImageTransform.

Parameters:

random - object to use (or null for deterministic)

dx1 - maximum warping in x for the top-left corner (pixels)

dy1 - maximum warping in y for the top-left corner (pixels)

dx2 - maximum warping in x for the top-right corner (pixels)

dy2 - maximum warping in y for the top-right corner (pixels)

dx3 - maximum warping in x for the bottom-right corner (pixels)

dy3 - maximum warping in y for the bottom-right corner (pixels)

dx4 - maximum warping in x for the bottom-left corner (pixels)

dy4 - maximum warping in y for the bottom-left corner (pixels)

Method Detail

doTransform

protected ImageWritable doTransform(ImageWritable image,
                                    Random random)

Takes an image and returns a transformed image. Uses the random object in the case of random transformations.

Specified by:

doTransform in class BaseImageTransform<org.bytedeco.opencv.opencv_core.Mat>

Parameters:

image - to transform, null == end of stream

random - object to use (or null for deterministic)

Returns:

transformed image

query

public float[] query(float... coordinates)

Description copied from interface: ImageTransform

Transforms the given coordinates using the parameters that were used to transform the last image.

Specified by:

query in interface ImageTransform

Overrides:

query in class BaseImageTransform<org.bytedeco.opencv.opencv_core.Mat>

Parameters:

coordinates - to transforms (x1, y1, x2, y2, ...)

Returns:

transformed coordinates