Class YarpImageHelper

java.lang.Object

YarpImageHelper

public class YarpImageHelper
extends java.lang.Object

Helper class to convert YARP image to Matlab matrices (images).

Constructor Summary

Constructors

Constructor	Description
YarpImageHelper(int h, int w)	Constructor, specify height and width of the image you are going to convert.

Method Summary

Modifier and Type	Method	Description
float[][]	get2DMatrix(ImageFloat img)	Converts a floating point YARP image to a two dimensional array.
short[][]	get2DMatrix(ImageRgb img)	Converts a color YARP image to a two dimensional array.
float[][]	get2DMatrixBlue(ImageRgbFloat img)	Access a floating point YARP image by planes.
float[][]	get2DMatrixGreen(ImageRgbFloat img)	Access a floating point YARP image by planes.
float[][]	get2DMatrixRed(ImageRgbFloat img)	Access a floating point YARP image by planes.
short[][][]	get3DMatrix(ImageRgb img)	Converts a YARP image to a 3D array.
short[][]	getB(ImageRgb img)	Access a YARP image by planes.
short[][]	getG(ImageRgb img)	Access a YARP image by planes.
short[][]	getMonoMatrix(ImageRgb img)	Converts a YARP image to grayscale.
short[][]	getR(ImageRgb img)	Access a YARP image by planes.
static short[]	getRawImg(ImageRgb img)	Fast conversion of a YARP image to a one dimensional array.
ImageRgb	setRawImg(short[] vec1ds, int height, int width, int pixelSize)	Fast conversion from matlab image format (based on leo's structure) to a YARP image format in MATLAB, the reshape function to modify the matrix to be a 1d vector IN = reshape(label, [h*w*pixelSize 1]); and, if not previously done cast it to int16 eg: tempImg = cast(IN,'int16'); \author Vadim Tikhanoff

Methods inherited from class java.lang.Object

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

Constructor Detail

YarpImageHelper

public YarpImageHelper(int h,
                       int w)

Constructor, specify height and width of the image you are going to convert.

Parameters:

h - image height

w - image width

Method Detail

getMonoMatrix

public short[][] getMonoMatrix(ImageRgb img)

Converts a YARP image to grayscale. Returns a height by width two dimensional array. This array is compatible with a Matlab matrix.

Parameters:

img - input image

Returns:

the two dimensional array which contains the image

get3DMatrix

public short[][][] get3DMatrix(ImageRgb img)

Converts a YARP image to a 3D array. This array is compatible with a [HxWx3] Matlab matrix. Note: passing 3d arrays from/to Matlab/Java is SLOW (at least on Matlab 6.5); use getB/getR/getG or get2DMatrix.

Parameters:

img - input image

Returns:

the three dimensional array which contains the image

getR

public short[][] getR(ImageRgb img)

Access a YARP image by planes. Returns a 2D array which contains the red plane, this is a [HxW] array compatible with Matlab.

Parameters:

img - input image

Returns:

the two dimensional array which contains the red plane

getG

public short[][] getG(ImageRgb img)

Access a YARP image by planes. Returns a 2D array which contains the green plane, this is a [HxW] array compatible with Matlab.

Parameters:

img - input image

Returns:

the two dimensional array which contains the green plane

getB

public short[][] getB(ImageRgb img)

Access a YARP image by planes. Returns a 2D array which contains the blue plane, this is a [HxW] array compatible with Matlab.

Parameters:

img - input image

Returns:

the two dimensional array which contains the blue plane

get2DMatrix

public short[][] get2DMatrix(ImageRgb img)

Converts a color YARP image to a two dimensional array. Returns a [Hx3*W] array which contains the 'justaposition' of the three color planes of the image. This array can be copied into a Matlab matrix: OUT=[R|G|B] where R, G, B are three [HxW] matrices formed by the color planes. From OUT you can create a color image [HxWx3] by typing: IMG=uint8(H,W,3); IMG(:,:,1)=OUT(:,1:W); IMG(:,:,2)=OUT(:,W+1:2*W); IMG(:,:,3)=OUT(:,2*W+1:3*W);

Parameters:

img - input image

Returns:

output array

get2DMatrix

public float[][] get2DMatrix(ImageFloat img)

Converts a floating point YARP image to a two dimensional array.

Parameters:

img - input image

Returns:

output array

get2DMatrixRed

public float[][] get2DMatrixRed(ImageRgbFloat img)

Access a floating point YARP image by planes. Returns a 2D array which contains the red plane, this is a [HxW] array compatible with Matlab.

Parameters:

img - input image

Returns:

the two dimensional array which contains the red plane

get2DMatrixGreen

public float[][] get2DMatrixGreen(ImageRgbFloat img)

Access a floating point YARP image by planes. Returns a 2D array which contains the green plane, this is a [HxW] array compatible with Matlab.

Parameters:

img - input image

Returns:

the two dimensional array which contains the green plane

get2DMatrixBlue

public float[][] get2DMatrixBlue(ImageRgbFloat img)

Access a floating point YARP image by planes. Returns a 2D array which contains the blue plane, this is a [HxW] array compatible with Matlab.

Parameters:

img - input image

Returns:

the two dimensional array which contains the blue plane

getRawImg

public static short[] getRawImg(ImageRgb img)

Fast conversion of a YARP image to a one dimensional array. In MATLAB, USE: reshape(OUT, [height width pixelsize]); Extended function to work with padding (Vadim Tikhanoff) \author Leo Pape

Parameters:

img - input image

Returns:

output array

setRawImg

public ImageRgb setRawImg(short[] vec1ds,
                          int height,
                          int width,
                          int pixelSize)

Fast conversion from matlab image format (based on leo's structure) to a YARP image format in MATLAB, the reshape function to modify the matrix to be a 1d vector IN = reshape(label, [h*w*pixelSize 1]); and, if not previously done cast it to int16 eg: tempImg = cast(IN,'int16'); \author Vadim Tikhanoff

Returns:

output yarp image