[英]OpenCV Error: Assertion failed when using COLOR_BGR2GRAY function
I'm having a weird issue with opencv. 我对opencv有一个奇怪的问题。 I have no issues when working in a jupyter notebook but do when trying to run this Sublime. 我在使用jupyter笔记本时没有问题,但在尝试运行这个Sublime时也没有问题。
The error is: OpenCV Error: Assertion failed (depth == CV_8U || depth == CV_16U || depth == CV_32F) in cvtColor, file /Users/jenkins/miniconda/1/x64/conda-bld/work/opencv-3.1.0/modules/imgproc/src/color.cpp, line 7935 错误是:OpenCV错误:cvtColor中的断言失败(深度== CV_8U ||深度== CV_16U ||深度== CV_32F),文件/ Users / jenkins / miniconda / 1 / x64 / conda-bld / work / opencv- 3.1.0 / modules / imgproc / src / color.cpp,第7935行
import numpy as np
import cv2
img = [[[150,160,170], [150,32, 199], [145, 212, 234], [145, 212, 234]],
[[150,190,170], [150,32, 199], [145, 212, 234], [145, 212, 234]],
[[150,160,170], [150,32, 199], [145, 212, 234], [145, 212, 234]],
[[150,160,170], [150,32, 199], [145, 212, 234], [145, 212, 234]]]
img = np.array(img)
def grayscale(x):
# plt.imshow(gray, cmap='gray')to show on screen
# turns dim from (32,32,3) to (32,32)
return cv2.cvtColor(x, cv2.COLOR_BGR2GRAY)
img2 = grayscale(img)
You need to specify the data type when you create the array. 您需要在创建阵列时指定数据类型。
When I try this code here, and check the dtype
of img
, I see the following: 当我在这里尝试这个代码,并检查img
的dtype
时,我看到以下内容:
>>> img.dtype
dtype('int32')
That doesn't match the requirements of cv2.cvtColor
. 这与cv2.cvtColor
的要求cv2.cvtColor
。
The range of values you initialize your image with appears to fall into 0-255, which would correspond to data type uint8
. 初始化图像的值范围似乎为0-255,这与数据类型uint8
相对应。
So, just do 所以,就这么做
img = np.array(img, dtype=np.uint8)
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