/// <summary> Splits the current subband in its four subbands. It changes the status
/// of this element (from a leaf to a node, and sets the filters), creates
/// the childs and initializes them. An IllegalArgumentException is thrown
/// if this subband is not a leaf.
///
/// <p>It uses the initChilds() method to initialize the childs.</p>
///
/// </summary>
/// <param name="hfilter">The horizontal wavelet filter used to decompose this
/// subband. It has to be a AnWTFilter object.
///
/// </param>
/// <param name="vfilter">The vertical wavelet filter used to decompose this
/// subband. It has to be a AnWTFilter object.
///
/// </param>
/// <returns> A reference to the LL leaf (subb_LL).
///
/// </returns>
/// <seealso cref="Subband.initChilds">
///
/// </seealso>
protected internal override Subband split(WaveletFilter hfilter, WaveletFilter vfilter)
{
// Test that this is a node
if (isNode)
{
throw new System.ArgumentException();
}
// Modify this element into a node and set the filters
isNode = true;
this.hFilter = (AnWTFilter)hfilter;
this.vFilter = (AnWTFilter)vfilter;
// Create childs
subb_LL = new SubbandAn();
subb_LH = new SubbandAn();
subb_HL = new SubbandAn();
subb_HH = new SubbandAn();
// Assign parent
subb_LL.parentband = this;
subb_HL.parentband = this;
subb_LH.parentband = this;
subb_HH.parentband = this;
// Initialize childs
initChilds();
// Return reference to LL subband
return(subb_LL);
}
/// <summary> Calculates the parameters of the SubbandAn objects that depend on the
/// Quantizer. The 'stepWMSE' field is calculated for each subband which is
/// a leaf in the tree rooted at 'sb', for the specified component. The
/// subband tree 'sb' must be the one for the component 'n'.
///
/// </summary>
/// <param name="sb">The root of the subband tree.
///
/// </param>
/// <param name="c">The component index
///
/// </param>
/// <seealso cref="SubbandAn.stepWMSE">
///
/// </seealso>
protected internal override void calcSbParams(SubbandAn sb, int c)
{
float baseStep;
if (sb.stepWMSE > 0f)
{
// parameters already calculated
return;
}
if (!sb.isNode)
{
if (isReversible(tIdx, c))
{
//UPGRADE_WARNING: Data types in Visual C# might be different. Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
sb.stepWMSE = (float)System.Math.Pow(2, -(src.getNomRangeBits(c) << 1)) * sb.l2Norm * sb.l2Norm;
}
else
{
//UPGRADE_TODO: The equivalent in .NET for method 'java.lang.Float.floatValue' may return a different value. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1043'"
baseStep = (float)((System.Single)qsss.getTileCompVal(tIdx, c));
if (isDerived(tIdx, c))
{
//UPGRADE_WARNING: Data types in Visual C# might be different. Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
sb.stepWMSE = baseStep * baseStep * (float)System.Math.Pow(2, (sb.anGainExp - sb.level) << 1) * sb.l2Norm * sb.l2Norm;
}
else
{
sb.stepWMSE = baseStep * baseStep;
}
}
}
else
{
calcSbParams((SubbandAn)sb.LL, c);
calcSbParams((SubbandAn)sb.HL, c);
calcSbParams((SubbandAn)sb.LH, c);
calcSbParams((SubbandAn)sb.HH, c);
sb.stepWMSE = 1f; // Signal that we already calculated this branch
}
}
/// <summary> Calculates the parameters of the SubbandAn objects that depend on the /// Quantizer. The 'stepWMSE' field is calculated for each subband which is /// a leaf in the tree rooted at 'sb', for the specified component. The /// subband tree 'sb' must be the one for the component 'n'. /// /// </summary> /// <param name="sb">The root of the subband tree. /// /// </param> /// <param name="n">The component index. /// /// </param> /// <seealso cref="SubbandAn.stepWMSE"> /// /// </seealso> protected internal abstract void calcSbParams(SubbandAn sb, int n);
