Method multiply

ij/src/main/java/ij/plugin/FFT.java:147–165

Multiplies a Fourier domain image by a filter @param imp A frequency domain image, which is modified. @param filter The filter, 32-bits (0-1) or 8-bits (0-255) @see #forward @see #inverse @see #filter

(ImagePlus imp, ImageProcessor filter)

	 * @see #filter
	*/
	public static void multiply(ImagePlus imp, ImageProcessor filter) {
		Object obj = imp.getProperty("FHT");
		FHT fht = obj!=null&&(obj instanceof FHT)?(FHT)obj:null;
		if (fht==null)
			return;
		int size = fht.getWidth();
		boolean isFloat = filter.getBitDepth()==32;
		if (!isFloat)
			filter =  filter.convertToByte(true);					
		filter = filter.resize(size, size);
		swapQuadrants(filter);
		float[] fhtPixels = (float[])fht.getPixels();
		for (int i=0; i<fhtPixels.length; i++) {
			if (isFloat)
				fhtPixels[i] = fhtPixels[i]*filter.getf(i);
			else
				fhtPixels[i] = (float)(fhtPixels[i]*(filter.get(i)/255.0));
		}
	}
	
	/**
	 * Performs an inverse FHT transform.