Parameters:  X : array_like, shape (n, m) or (n, m, 3) or (n, m, 4)
Display the image in X to current axes. X may be an
array or a PIL image. If X is an array, it
can have the following shapes and types:
 MxN – values to be mapped (float or int)
 MxNx3 – RGB (float or uint8)
 MxNx4 – RGBA (float or uint8)
The value for each component of MxNx3 and MxNx4 float arrays
should be in the range 0.0 to 1.0. MxN arrays are mapped
to colors based on the norm (mapping scalar to scalar)
and the cmap (mapping the normed scalar to a color).
cmap : Colormap , optional, default: None
If None, default to rc image.cmap value. cmap is ignored
if X is 3D, directly specifying RGB(A) values.
aspect : [‘auto’  ‘equal’  scalar], optional, default: None
If ‘auto’, changes the image aspect ratio to match that of the
axes.
If ‘equal’, and extent is None, changes the axes aspect ratio to
match that of the image. If extent is not None , the axes
aspect ratio is changed to match that of the extent.
If None, default to rc image.aspect value.
interpolation : string, optional, default: None
Acceptable values are ‘none’, ‘nearest’, ‘bilinear’, ‘bicubic’,
‘spline16’, ‘spline36’, ‘hanning’, ‘hamming’, ‘hermite’, ‘kaiser’,
‘quadric’, ‘catrom’, ‘gaussian’, ‘bessel’, ‘mitchell’, ‘sinc’,
‘lanczos’
If interpolation is None, default to rc image.interpolation .
See also the filternorm and filterrad parameters.
If interpolation is ‘none’, then no interpolation is performed
on the Agg, ps and pdf backends. Other backends will fall back to
‘nearest’.
norm : Normalize , optional, default: None
A Normalize instance is used to scale
a 2D float X input to the (0, 1) range for input to the
cmap . If norm is None, use the default func:normalize .
If norm is an instance of NoNorm ,
X must be an array of integers that index directly into
the lookup table of the cmap .
vmin, vmax : scalar, optional, default: None
vmin and vmax are used in conjunction with norm to normalize
luminance data. Note if you pass a norm instance, your
settings for vmin and vmax will be ignored.
alpha : scalar, optional, default: None
The alpha blending value, between 0 (transparent) and 1 (opaque)
origin : [‘upper’  ‘lower’], optional, default: None
Place the [0,0] index of the array in the upper left or lower left
corner of the axes. If None, default to rc image.origin .
extent : scalars (left, right, bottom, top), optional, default: None
The location, in datacoordinates, of the lowerleft and
upperright corners. If None , the image is positioned such that
the pixel centers fall on zerobased (row, column) indices.
shape : scalars (columns, rows), optional, default: None
filternorm : scalar, optional, default: 1
A parameter for the antigrain image resize filter. From the
antigrain documentation, if filternorm = 1, the filter
normalizes integer values and corrects the rounding errors. It
doesn’t do anything with the source floating point values, it
corrects only integers according to the rule of 1.0 which means
that any sum of pixel weights must be equal to 1.0. So, the
filter function must produce a graph of the proper shape.
filterrad : scalar, optional, default: 4.0
The filter radius for filters that have a radius parameter, i.e.
when interpolation is one of: ‘sinc’, ‘lanczos’ or ‘blackman’
