Read a complex token and output double tokens that represent the real and
   imaginary parts to two different output ports.
   @author Michael Leung, Edward A. Lee, Paul Whitaker
   @version $Id: ComplexToCartesian.java,v 1.1 2006/10/18 08:26:21 bmastromarco Exp $
   @since Ptolemy II 1.0

   the output integer is a negative number. The least significant bit is
   the last boolean token received.
   @author Michael Leung
   @version $Id: BitsToInt.java,v 1.1 2006/10/18 08:26:21 bmastromarco Exp $
   @since Ptolemy II 0.4

   An exception is thrown if the input integer is smaller than
   -2<sup><i>k</i></sup> or greater 2<sup><i>k</i></sup> - 1.
   @author Michael Leung
   @version $Id: IntToBits.java,v 1.1 2006/10/18 08:26:21 bmastromarco Exp $
   @since Ptolemy II 0.4

   The implementation uses java.lang.Math.atan2(double, double).
   @see java.lang.Math#atan2(double, double)
   @author Michael Leung, Edward A. Lee, and Paul Whitaker
   @version $Id: ComplexToPolar.java,v 1.1 2006/10/18 08:26:21 bmastromarco Exp $
   @since Ptolemy II 1.0

   The implementation uses java.lang.Math.atan2(double, double).
   @see java.lang.Math#atan2(double, double)
   @author Michael Leung, Edward A. Lee, Paul Whitaker
   @version $Id: CartesianToPolar.java,v 1.1 2006/10/18 08:26:21 bmastromarco Exp $
   @since Ptolemy II 1.0

to be in radians. If either input is NaN or infinity, then the outputs are
NaN or infinity.
@author Michael Leung, Edward A. Lee, Paul Whitaker
@version $Id: PolarToCartesian.java,v 1.1 2006/10/18 08:26:21 bmastromarco Exp $
@since Ptolemy II 1.0

assumed to be in radians. If either input is NaN or infinity,
then the output is NaN or infinity.
@author Michael Leung, Edward A. Lee, Paul Whitaker
@version $Id: PolarToComplex.java,v 1.1 2006/10/18 08:26:21 bmastromarco Exp $
@since Ptolemy II 1.0

   output port. The x input becomes the real output and the y input becomes the
   imaginary output. If either input port is empty, nothing is produced.
   @author Michael Leung, Jie Liu, Edward A. Lee, Paul Whitaker
   @version $Id: CartesianToComplex.java,v 1.1 2006/10/18 08:26:21 bmastromarco Exp $
   @since Ptolemy II 1.0

   Power Signal to Noise Ratio (PSNR) between them.  The PSNR is output on the
   output port as a DoubleToken.
   @author Michael Leung, Steve Neuendorffer
   @version $Id: PSNR.java,v 1.1 2006/10/05 12:37:06 bmastromarco Exp $
   @since Ptolemy II 0.4

   This actor uses gray scale equalization to redistribute the value of each
   pixel between 0 and 255.
   @author Michael Leung, Steve Neuendorffer
   @version $Id: ImageContrast.java,v 1.1 2006/10/05 12:37:06 bmastromarco Exp $
   @since Ptolemy II 0.2

   Power Signal to Noise Ratio (PSNR) between them.  The PSNR is output on the
   output port as a DoubleToken.
   @author Michael Leung, Steve Neuendorffer
   @version $Id: PSNR.java,v 1.1 2006/10/05 12:37:06 bmastromarco Exp $
   @since Ptolemy II 0.4

   This actor uses gray scale equalization to redistribute the value of each
   pixel between 0 and 255.
   @author Michael Leung, Steve Neuendorffer
   @version $Id: ImageContrast.java,v 1.1 2006/10/05 12:37:06 bmastromarco Exp $
   @since Ptolemy II 0.2