Usage of the Erosion Plugin

[Stefan Schraß]

Hi there,

I want to erode an image. But I apparently don't use the plugin the right way.

I've loaded the plugin and tried to set the attribut "matrix" with an Boolean[3][3] all "true".

int structuringElementSize = 3;
Boolean[][] structuringElement = new Boolean[structuringElementSize][structuringElementSize];
for (int i = 0; i < structuringElementSize; i++){
    for (int j = 0; j < structuringElementSize; j++) {
        structuringElement[i][j] = true;
    }
}

MarvinImagePlugin.setAttributes("matrix", structuringElement);

But I get an
java.lang.ClassCastException: [[Ljava.lang.Boolean; cannot be cast to [[Z
at org.marvinproject.image.morphological.erosion.Erosion.process(Erosion.java:30)

And I can't figure out what I am doing wrong. So any help is welcome.

[Stefan Schraß]

figured it out... silly mistake.

Boolean != boolean, since Boolean is an Object and boolean a primitive type. Therefore the cast failed.

[Gabriel Archanjo]

Hi,

Another tip! You can declare a 3x3 matrix in this way:

boolean[][] matrix_3x3 = new boolean[][] {

{true,true,true},

{true,true,true},

{true,true,true}

};

 Do not forget to convert your MarvinImage to the binary format before using morphological plug-ins. Use MarvinColorModelConverter for this purpose: http://marvinproject.sourceforge.net/javadoc/marvin/image/MarvinColorModelConverter.html

Kind regards,

Gabriel