/**
* Integer version of {@link #biorthogonal_F32}.
*
* @param J The wavelet's degree. K = J-2.
* @param borderType How image borders are handled.
* @return Description of the Daub J/K wavelet.
*/
public static WaveletDescription<WlCoef_I32> biorthogonal_I32(int J, BorderType borderType) {
if (J != 5) {
throw new IllegalArgumentException("Only 5 is currently supported");
}
WlCoef_I32 forward = new WlCoef_I32();
forward.offsetScaling = -2;
forward.offsetWavelet = 0;
forward.scaling = new int[5];
forward.wavelet = new int[3];
forward.denominatorScaling = 8;
forward.scaling[0] = -1;
forward.scaling[1] = 2;
forward.scaling[2] = 6;
forward.scaling[3] = 2;
forward.scaling[4] = -1;
forward.denominatorWavelet = 2;
forward.wavelet[0] = -1;
forward.wavelet[1] = 2;
forward.wavelet[2] = -1;
BorderIndex1D border;
WlBorderCoef<WlCoef_I32> inverse;
if (borderType == BorderType.WRAP) {
WlCoef_I32 inner = computeInnerBiorthogonalInverse(forward);
inverse = new WlBorderCoefStandard<>(inner);
border = new BorderIndex1D_Wrap();
} else if (borderType == BorderType.REFLECT) {
WlCoef_I32 inner = computeInnerBiorthogonalInverse(forward);
inverse =
convertToInt(
(WlBorderCoefFixed<WlCoef_F32>) biorthogonal_F32(J, borderType).getInverse(), inner);
border = new BorderIndex1D_Reflect();
} else {
throw new IllegalArgumentException("Unsupported border type: " + borderType);
}
return new WaveletDescription<>(border, forward, inverse);
}
private static void convertCoef_F32_to_I32(
int denominatorScaling, int denominatorWavelet, WlCoef_F32 o, WlCoef_I32 r) {
r.denominatorScaling = denominatorScaling;
r.denominatorWavelet = denominatorWavelet;
r.scaling = new int[o.scaling.length];
r.wavelet = new int[o.wavelet.length];
r.offsetScaling = o.offsetScaling;
r.offsetWavelet = o.offsetWavelet;
for (int j = 0; j < o.scaling.length; j++) {
r.scaling[j] = Math.round(o.scaling[j] * denominatorScaling);
}
for (int j = 0; j < o.wavelet.length; j++) {
r.wavelet[j] = Math.round(o.wavelet[j] * denominatorWavelet);
}
}
private static WlCoef_I32 computeInnerBiorthogonalInverse(WlCoef_I32 coef) {
WlCoef_I32 ret = new WlCoef_I32();
// center at zero
ret.offsetScaling = -coef.wavelet.length / 2;
// center at one
ret.offsetWavelet = 1 - coef.scaling.length / 2;
ret.denominatorScaling = coef.denominatorWavelet;
ret.denominatorWavelet = coef.denominatorScaling;
ret.scaling = new int[coef.wavelet.length];
ret.wavelet = new int[coef.scaling.length];
for (int i = 0; i < ret.scaling.length; i++) {
if (i % 2 == 0) ret.scaling[i] = -coef.wavelet[i];
else ret.scaling[i] = coef.wavelet[i];
}
for (int i = 0; i < ret.wavelet.length; i++) {
if (i % 2 == 1) ret.wavelet[i] = -coef.scaling[i];
else ret.wavelet[i] = coef.scaling[i];
}
return ret;
}
