import matplotlib.pyplot as plt
import numpy as np


data = np.array([[0,0,2,2],
                 [0,0,2,2],
                 [2,2,2,3],
                 [2,2,3,3]])

fig = plt.figure()
sbplt = fig.add_subplot()
sbplt.imshow( data ,cmap='jet')

sbplt.set_xticks([])
sbplt.set_yticks([])

H,W = data.shape
for i in range(H):
    for j in range(W):
        _ = sbplt.text(j, i, int(data[i,j]),
                    ha="center", va="center", color="w")

fig.savefig('/tmp/hoge.pdf')