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public BufferedImage dilate3(BufferedImage bi)
{
BufferedImage buff = new BufferedImage(bi.getWidth(), bi.getHeight(), bi.getType());

Kernel kernel = new Kernel(3, 3, new float[] {
1f, 1f, 1f,
1f, 1f, 1f,
1f, 1f, 1f
});

ConvolveOp op = new ConvolveOp(kernel);
op.filter(bi, buff);

return buff;
}

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