def build(step):
return BlockBitHider(
TransformHider(
SingleBitHider(ScanMapping(),
BinaryQuantizationIndexModulation(step)),
ImageTransform(
SeparableTransform(transform.TCHEBICHEF, transform.DCT2))))
def build(step, alpha, dimension=8):
CHARLIER = matrix.CharlierMatrix(dimension, alpha=alpha).get_values()
return BlockBitHider(
TransformHider(
SingleBitHider(ScanMapping(),
BinaryQuantizationIndexModulation(step)),
ImageTransform(SeparableTransform(CHARLIER, transform.DCT2))))
def build(step, a, q, dimension=8):
qc = QCharlierMatrix(dimension, a=a, q=q)
th = TchebichefMatrix(dimension, N=dimension)
transform = SeparableTransform(qc.get_values(), th.get_values())
return BlockBitHider(
TransformHider(
SingleBitHider(ScanMapping(),
BinaryQuantizationIndexModulation(step)),
ImageTransform(transform)))