boofcv.alg.interpolate

Class ImageLineIntegral

java.lang.Object

boofcv.alg.interpolate.ImageLineIntegral

public class ImageLineIntegral
extends java.lang.Object

Computes the line integral of a line segment across the image. A line is laid over the image and the fraction of the line which is over a pixel is multiplied by the pixel's value. This is done for each pixel it overlaps.

Two different functions are provided below for handling pixels lines which are either contained entirely inside the image or may contain elements which extend outside the image. If a pixel extends outside the image then ImageBorder is used to handle the pixels outside the image. If the border is not specified then it will likely crash.

Inside image definition:
0 &le x < width
0 &le y < height

Constructor Summary

Constructors

Constructor and Description
ImageLineIntegral()

Method Summary

Modifier and Type	Method and Description
double	compute(double x0, double y0, double x1, double y1) Computes the line segment's line integral across the inside of the image.
double	getLength() Returns the line segment's length
boolean	isInside(double x, double y) Return true if the coordinate is inside the image or false if not. 0 ≤ x ≤ width 0 ≤ y ≤ height
void	setImage(GImageGray image) Specify input image.

Methods inherited from class java.lang.Object

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

Constructor Detail

ImageLineIntegral

public ImageLineIntegral()

Method Detail

setImage

public void setImage(GImageGray image)

Specify input image.

Parameters:

image - image

compute

public double compute(double x0,
                      double y0,
                      double x1,
                      double y1)

Computes the line segment's line integral across the inside of the image. Where the inside is defined as 0 ≤ x ≤ width and 0 ≤ y ≤ height.

Parameters:

x0 - end point of line segment. x-coordinate

y0 - end point of line segment. y-coordinate

x1 - end point of line segment. x-coordinate

y1 - end point of line segment. y-coordinate

Returns:

line integral

isInside

public boolean isInside(double x,
                        double y)

Return true if the coordinate is inside the image or false if not.
0 ≤ x ≤ width
0 ≤ y ≤ height

Note: while the image is defined up to width and height, including coordinates up to that point contribute nothing towards the line integral since they are infinitesimally small.

Parameters:

x - x-coordinate in pixel coordinates

y - y-coordinate in pixel coordinates

Returns:

true if inside or false if outside

getLength

public double getLength()

Returns the line segment's length

Returns:

length