Ejemplos de PyGFT.shift en Python

Ejemplo n.º 1

def gaussianWindow(signal,t,k):
	l = len(signal)
	x = numpy.arange(0,1,1./l).astype(numpy.complex64)
	win = 1*numpy.abs(k)/numpy.sqrt(2*numpy.pi)*numpy.e**(-(x-0.5)**2*numpy.abs(k)**2/2.)
	win = win/(numpy.sum(win)/l)
	win = gft.shift(win,-l/2)
	win = gft.shift(win,t)
	return win

Ejemplo n.º 2

def transform2D():
	N = 256
	image = numpy.zeros((N,N))

	image1 = numpy.copy(image); image1[N/2,N/2] = 1.0
	plot2D(image1,'gaussian','Transform of A 2D Delta: Gaussian Window')
	plot2D(image1,'box','Transform of A 2D Delta: Boxcar Window')

	image2 = dist(image); image2 /= numpy.max(numpy.ravel(numpy.abs(image2))); image2 = numpy.cos(2*numpy.pi*96*image2)
	plot2D(image2,'gaussian','Transform of A Circularly Symmetric Cosine: Gaussian Window')
	plot2D(image2,'box','Transform of A Circularly Symmetric Cosine: Boxcar Window')

	image3 = dist(image); image3 /= numpy.max(numpy.ravel(numpy.abs(image3))); image3 = numpy.cos(2*numpy.pi*48*image3)*gaussian2D(image3,8)
	image3 = gft.shift(image3,-N/4,-N/4)
	image3 += gft.shift(image2*gaussian2D(image3,8),N/4,N/4)
	plot2D(image3,'gaussian','Transform of A Gaussian Modulated Circularly Symmetric Cosine: Gaussian Window')
	plot2D(image3,'box','Transform of A Gaussian Modulated Circularly Symmetric Cosine: Boxcar Window')