Support conversion of complex-valued ImgLib2 images to Python

[rafaelgov95]

I'm not able to print FFT results with ij.py.show!

import skimage
import imagej
import numpy as np
from skimage import io
import imagej
import imglyb
from jnius import cast
from jnius import autoclass


ij = imagej.init('sc.fiji:fiji:2.0.0-pre-10')

img = io.imread('https://www.fi.edu/sites/fi.live.franklinds.webair.com/files/styles/featured_large/public/General_EduRes_Heart_BloodVessels_0.jpg')

img = np.mean(img, axis=2)
print(ij.op().help('filter.fft'))
result= ij.op().filter().fft(ij.py.to_java(img))

Error 'JavaException: JVM exception occurred: java.util.concurrent.ExecutionException: java.lang.ClassCastException: net.imglib2.type.numeric.complex.ComplexFloatType cannot be cast to net.imglib2.type.numeric.real.AbstractRealType java.lang.RuntimeException'

[ctrueden]

@rafaelgov95 Apologies that this was never answered. The problem is that ImgLib2 images can be complex-valued, and we are not handling conversion of this case.

[ctrueden]

I wish someone at LOCI had time to work on this, but we don't. So it remains an open opportunity for enhancement. 😉