我正在尝试从训练目录中绘制一堆增强图像。我正在使用Keras和Tensorflow。可视化库是matplotlib。我使用下面的代码在6行和6列中绘制256 X 256 X 1
灰色图像。我得到的错误是
Invalid Dimensions for image data.
以下是我正在使用的代码: -
%matplotlib inline
import matplotlib.pyplot as plt
import numpy as np
import keras
from keras.preprocessing.image import ImageDataGenerator
train_set = '/home/ai/IPI/Data/v1_single_model/Train/' # Use your own path
batch_size = 4
gen = ImageDataGenerator(rescale = 1. / 255)
train_batches = gen.flow_from_directory(
'data/train',
target_size=(256, 256),
batch_size=batch_size,
class_mode='binary')
def plot_images(img_gen, img_title):
fig, ax = plt.subplots(6,6, figsize=(10,10))
plt.suptitle(img_title, size=32)
plt.setp(ax, xticks=[], yticks=[])
plt.tight_layout(rect=[0, 0.03, 1, 0.95])
for (img, label) in img_gen:
for i in range(6):
for j in range(6):
if i*6 + j < 256:
ax[i][j].imshow(img[i*6 + j])
break
plot_images(train_batches, "Augmented Images")
以下是错误和python回溯的快照: -
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-79-81bdb7f0d12e> in <module>()
----> 1 plot_images(train_batches, "Augmented Images")
<ipython-input-78-d1d4bba983d3> in plot_images(img_gen, img_title)
8 for j in range(6):
9 if i*6 + j < 32:
---> 10 ax[i][j].imshow(img[i*6 + j])
11 break
~/anaconda3/lib/python3.6/site-packages/matplotlib/__init__.py in inner(ax, *args, **kwargs)
1896 warnings.warn(msg % (label_namer, func.__name__),
1897 RuntimeWarning, stacklevel=2)
-> 1898 return func(ax, *args, **kwargs)
1899 pre_doc = inner.__doc__
1900 if pre_doc is None:
~/anaconda3/lib/python3.6/site-packages/matplotlib/axes/_axes.py in imshow(self, X, cmap, norm, aspect, interpolation, alpha, vmin, vmax, origin, extent, shape, filternorm, filterrad, imlim, resample, url, **kwargs)
5122 resample=resample, **kwargs)
5123
-> 5124 im.set_data(X)
5125 im.set_alpha(alpha)
5126 if im.get_clip_path() is None:
~/anaconda3/lib/python3.6/site-packages/matplotlib/image.py in set_data(self, A)
598 if (self._A.ndim not in (2, 3) or
599 (self._A.ndim == 3 and self._A.shape[-1] not in (3, 4))):
--> 600 raise TypeError("Invalid dimensions for image data")
601
602 self._imcache = None
TypeError: Invalid dimensions for image data
我做错了什么?
答案 0 :(得分:4)
错误告诉你出了什么问题。您的图片形状为(1,n,m,1)
,在第一个循环中您选择img[0]
,这会导致数组形状为(n,m,1)
,因此
self._A.ndim == 3 and self._A.shape[-1] not in (3, 4)
来自matplotlib.pyplot.imshow(X, ...)
documentation
X
:array_like,shape(n,m)或(n,m,3)或(n,m,4)
但不是(n,m,1)
。
除此之外img[i*6 + j]
i*6 + j > 0
会尽快失败。
图片img
尺寸为(samples, height, width, channels)
。 img
是单个样本,因此samples = 1
;它是灰度,因此channels = 1
。要获取形状(n,m)
的图像,您需要选择它
imshow(img[0,:,:,0])