'Returns the image data after it has been processed by any normalization options in use.
This method also sets the attributes self.levelMin and self.levelMax
to indicate the range of data in the image.'

def getProcessedImage(self):

    if (self.imageDisp is None):
        image = self.normalize(self.image)
        self.imageDisp = image
        (self.levelMin, self.levelMax) = list(map(float, self.quickMinMax(self.imageDisp)))
    return self.imageDisp
