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)
MxN arrays are mapped to colors based on the norm (mapping
scalar to scalar) and the cmap (mapping the normed scalar to
a color).
Elements of RGB and RGBA arrays represent pixels of an MxN image.
All values should be in the range [0 .. 1] for floats or
[0 .. 255] for integers. Outofrange values will be clipped to
these bounds.
 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).
The alpha argument is ignored for RGBA input data.
 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
For raw buffer images
 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'
