org.openimaj.video.processing.motion

Class GridMotionEstimator

java.lang.Object

org.openimaj.video.Video<T>

org.openimaj.video.processor.VideoProcessor<T>

org.openimaj.video.analyser.VideoAnalyser<FImage>

org.openimaj.video.processing.motion.MotionEstimator

org.openimaj.video.processing.motion.GridMotionEstimator

All Implemented Interfaces:

Closeable, AutoCloseable, Iterable<FImage>

public class GridMotionEstimator
extends MotionEstimator

Estimates the motion field over a grid.

Author:

David Dupplaw (dpd@ecs.soton.ac.uk)

Created:

1 Mar 2012

Field Summary

Fields inherited from class org.openimaj.video.processing.motion.MotionEstimator

motionVectors

Constructor Summary

Constructors

Constructor and Description
GridMotionEstimator(MotionEstimatorAlgorithm alg, int x, int y, boolean fixed) Construct a grid-based motion estimator.
GridMotionEstimator(Video<FImage> v, MotionEstimatorAlgorithm alg, int x, int y, boolean fixed) Construct a chained grid-based motion estimator.

Method Summary

Modifier and Type	Method and Description
protected Map<Point2d,Point2d>	estimateMotionField(MotionEstimatorAlgorithm estimator, VideoFrame<FImage> vf, VideoFrame<FImage>[] array) This method needs to be overridden for specific layouts of motion field within the image.

Methods inherited from class org.openimaj.video.processing.motion.MotionEstimator

analyseFrame, getMotionVectors

Methods inherited from class org.openimaj.video.analyser.VideoAnalyser

processFrame

Methods inherited from class org.openimaj.video.processor.VideoProcessor

countFrames, getCurrentFrame, getFPS, getHeight, getNextFrame, getTimeStamp, getWidth, hasNextFrame, process, process, processingComplete, reset

Methods inherited from class org.openimaj.video.Video

close, getCurrentFrameIndex, iterator, seek, setCurrentFrameIndex

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Detail

GridMotionEstimator

public GridMotionEstimator(MotionEstimatorAlgorithm alg,
                           int x,
                           int y,
                           boolean fixed)

Construct a grid-based motion estimator. If fixed is true, the x and y values represent the width and height of the pixel blocks. If fixed is false, the x and y represent the number of grid elements to spread evenly across the frame.

Parameters:

alg - The estimator algorithm to use

x - The x value

y - The y value

fixed - Whether x and y represent pixels or grid count.

GridMotionEstimator

public GridMotionEstimator(Video<FImage> v,
                           MotionEstimatorAlgorithm alg,
                           int x,
                           int y,
                           boolean fixed)

Construct a chained grid-based motion estimator. If fixed is true, the x and y values represent the width and height of the pixel blocks. If fixed is false, the x and y represent the number of grid elements to spread evenly across the frame.

Parameters:

v - The video to chain to

alg - The estimator algorithm to use

x - The x value

y - The y value

fixed - Whether x and y represent pixels or grid count.

Method Detail

estimateMotionField

protected Map<Point2d,Point2d> estimateMotionField(MotionEstimatorAlgorithm estimator,
                                                   VideoFrame<FImage> vf,
                                                   VideoFrame<FImage>[] array)

This method needs to be overridden for specific layouts of motion field within the image.

Specified by:

estimateMotionField in class MotionEstimator

vf - The current frame

array - The list of previous frames (based on the estimator)

Returns:

The motion field

See Also:

org.openimaj.video.analysis.motion.MotionEstimator#estimateMotionField(org.openimaj.video.analysis.motion.MotionEstimator.MotionEstimatorAlgorithm, org.openimaj.image.FImage, org.openimaj.image.FImage[])