当我尝试使用以下代码绘制histogram bar plot时。
def show_rgb_hist(image):
colours = ('r','g','b')
for i, c in enumerate(colours):
plt.figure(figsize=(20, 4))
histr = cv2.calcHist([image], [i], None, [256], [0, 256])
# plt.plot(histr, color=c, lw=2)
print(histr)
if c == 'r':
colours = [((i/256, 0, 0)) for i in range(0, 256)]
if c == 'g':
colours = [((0, i/256, 0)) for i in range(0, 256)]
if c == 'b':
colours = [((0, 0, i/256)) for i in range(0, 256)]
plt.bar(range(0, 256), histr, color=colours, edgecolor=colours, width=1)
# plt.xlim([0, 256])
plt.show()
show_rgb_hist(image)
我收到以下错误：
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-49-f1c3e87fb229> in <module>()
22 plt.show()
23
---> 24 show_rgb_hist(image)
<ipython-input-49-f1c3e87fb229> in show_rgb_hist(image)
17
18
---> 19 plt.bar(range(0, 256), histr, color=colours, edgecolor=colours, width=1)
20 # plt.xlim([0, 256])
21
~/anaconda3/lib/python3.6/site-packages/matplotlib/pyplot.py in bar(*args, **kwargs)
2646 mplDeprecation)
2647 try:
-> 2648 ret = ax.bar(*args, **kwargs)
2649 finally:
2650 ax._hold = washold
~/anaconda3/lib/python3.6/site-packages/matplotlib/__init__.py in inner(ax, *args, **kwargs)
1715 warnings.warn(msg % (label_namer, func.__name__),
1716 RuntimeWarning, stacklevel=2)
-> 1717 return func(ax, *args, **kwargs)
1718 pre_doc = inner.__doc__
1719 if pre_doc is None:
~/anaconda3/lib/python3.6/site-packages/matplotlib/axes/_axes.py in bar(self, *args, **kwargs)
2083 edgecolor=e,
2084 linewidth=lw,
-> 2085 label='_nolegend_',
2086 )
2087 r.update(kwargs)
~/anaconda3/lib/python3.6/site-packages/matplotlib/patches.py in __init__(self, xy, width, height, angle, **kwargs)
657 """
658
--> 659 Patch.__init__(self, **kwargs)
660
661 self._x = xy[0]
~/anaconda3/lib/python3.6/site-packages/matplotlib/patches.py in __init__(self, edgecolor, facecolor, color, linewidth, linestyle, antialiased, hatch, fill, capstyle, joinstyle, **kwargs)
101 self.set_fill(fill)
102 self.set_linestyle(linestyle)
--> 103 self.set_linewidth(linewidth)
104 self.set_antialiased(antialiased)
105 self.set_hatch(hatch)
~/anaconda3/lib/python3.6/site-packages/matplotlib/patches.py in set_linewidth(self, w)
349 w = mpl.rcParams['axes.linewidth']
350
--> 351 self._linewidth = float(w)
352 # scale the dash pattern by the linewidth
353 offset, ls = self._us_dashes
TypeError: only size-1 arrays can be converted to Python scalars
这里
histr：
[[0.000e+00]
[0.000e+00]
[0.000e+00]
[0.000e+00]
[0.000e+00]
[0.000e+00]
[0.000e+00]
[0.000e+00]
[1.000e+00]
[1.700e+01]
[8.700e+01]
[2.620e+02]
[2.860e+02]
[3.000e+02]
[4.220e+02]
[6.880e+02]
[1.323e+03]
[1.921e+03]
[1.929e+03]
[1.527e+03]
[9.850e+02]
[6.630e+02]
[4.850e+02]
[4.710e+02]
[4.550e+02]
[4.300e+02]
[4.520e+02]
[4.310e+02]
[4.660e+02]
[5.460e+02]
[5.910e+02]
[6.080e+02]
[6.660e+02]
[6.330e+02]
[6.280e+02]
[6.890e+02]
[7.380e+02]
[6.410e+02]
[6.150e+02]
[6.340e+02]
[6.130e+02]
[6.320e+02]
[6.660e+02]
[6.430e+02]
[6.310e+02]
[6.280e+02]
[6.760e+02]
[6.590e+02]
[6.380e+02]
[6.830e+02]
[6.170e+02]
[6.550e+02]
[6.690e+02]
[6.960e+02]
[7.230e+02]
[6.980e+02]
[8.560e+02]
[8.600e+02]
[8.500e+02]
[9.230e+02]
[9.250e+02]
[9.680e+02]
[1.069e+03]
[1.232e+03]
[1.333e+03]
[1.279e+03]
[1.378e+03]
[1.455e+03]
[1.527e+03]
[1.724e+03]
[1.986e+03]
[2.080e+03]
[2.363e+03]
[2.468e+03]
[2.535e+03]
[2.565e+03]
[2.572e+03]
[2.552e+03]
[2.399e+03]
[2.493e+03]
[2.562e+03]
[2.506e+03]
[2.461e+03]
[2.497e+03]
[2.466e+03]
[2.532e+03]
[2.590e+03]
[2.684e+03]
[2.772e+03]
[2.817e+03]
[2.865e+03]
[2.735e+03]
[2.708e+03]
[2.903e+03]
[3.105e+03]
[3.042e+03]
[3.151e+03]
[3.011e+03]
[3.022e+03]
[3.288e+03]
[3.584e+03]
[3.727e+03]
[4.296e+03]
[4.602e+03]
[4.926e+03]
[4.898e+03]
[4.506e+03]
[4.410e+03]
[4.288e+03]
[4.148e+03]
[4.090e+03]
[3.954e+03]
[4.042e+03]
[4.204e+03]
[4.346e+03]
[4.328e+03]
[4.077e+03]
[3.932e+03]
[3.898e+03]
[3.877e+03]
[3.543e+03]
[3.477e+03]
[3.380e+03]
[3.459e+03]
[3.354e+03]
[3.462e+03]
[3.388e+03]
[3.332e+03]
[3.122e+03]
[3.001e+03]
[3.021e+03]
[2.900e+03]
[2.987e+03]
[3.054e+03]
[3.027e+03]
[2.735e+03]
[2.396e+03]
[2.071e+03]
[1.848e+03]
[1.870e+03]
[1.679e+03]
[1.720e+03]
[1.581e+03]
[1.532e+03]
[1.407e+03]
[1.390e+03]
[1.358e+03]
[1.256e+03]
[1.237e+03]
[1.096e+03]
[1.096e+03]
[9.560e+02]
[8.970e+02]
[8.420e+02]
[8.500e+02]
[8.550e+02]
[8.450e+02]
[8.040e+02]
[8.130e+02]
[7.530e+02]
[7.760e+02]
[7.700e+02]
[7.430e+02]
[7.400e+02]
[7.350e+02]
[7.190e+02]
[7.630e+02]
[7.400e+02]
[7.850e+02]
[7.750e+02]
[7.830e+02]
[7.090e+02]
[7.820e+02]
[7.890e+02]
[7.860e+02]
[7.200e+02]
[7.060e+02]
[6.510e+02]
[6.820e+02]
[6.460e+02]
[5.930e+02]
[5.920e+02]
[4.670e+02]
[5.120e+02]
[4.820e+02]
[4.750e+02]
[5.010e+02]
[5.040e+02]
[4.970e+02]
[4.380e+02]
[5.090e+02]
[4.830e+02]
[4.660e+02]
[4.240e+02]
[4.870e+02]
[4.770e+02]
[4.860e+02]
[4.960e+02]
[4.720e+02]
[4.870e+02]
[4.440e+02]
[4.600e+02]
[4.480e+02]
[4.250e+02]
[4.270e+02]
[3.850e+02]
[3.700e+02]
[4.120e+02]
[3.860e+02]
[3.860e+02]
[3.890e+02]
[3.650e+02]
[3.680e+02]
[3.570e+02]
[3.490e+02]
[3.600e+02]
[3.620e+02]
[3.070e+02]
[3.410e+02]
[3.410e+02]
[3.270e+02]
[3.120e+02]
[3.320e+02]
[2.940e+02]
[2.780e+02]
[2.750e+02]
[2.790e+02]
[2.660e+02]
[2.960e+02]
[2.570e+02]
[2.780e+02]
[2.630e+02]
[2.820e+02]
[2.830e+02]
[2.220e+02]
[1.820e+02]
[1.780e+02]
[2.020e+02]
[1.620e+02]
[1.840e+02]
[1.500e+02]
[1.620e+02]
[1.360e+02]
[1.050e+02]
[1.060e+02]
[1.170e+02]
[9.400e+01]
[7.300e+01]
[6.900e+01]
[6.400e+01]
[7.000e+01]
[6.100e+01]
[5.500e+01]
[6.100e+01]
[8.000e+01]
[3.590e+02]]
NB：
cv2.__version__
'3.4.1'
我该如何解决这个问题？