Python-OpenCV cv2 OpenCV 错误:断言失败 [英] Python-OpenCV cv2 OpenCV Error: Assertion failed

问题描述

我正在尝试使用 openCV 在 python 中创建一个图像.我制作了一个列表列表，每个列表有 16 个数字，从 0 到 255(16 个列表).然后我将大列表转换为 numpy ndarray，并尝试使用 cv2.imwrite() 将其写入图像.这是我的代码:

I'm trying to create an image in python using openCV. I make a list of lists, each list having 16 numbers, from 0 to 255 (16 lists). Then I convert the big list in a numpy ndarray, and try to write that into an image using cv2.imwrite(). This is my code:

import cv2
import numpy as np

colours = []
numbers = []
a=0
for i in range(256):
    numbers.append(a)
    a+=1

for x in range(16):
    new_list = [numbers[16*x:16*x+16]]
    colours.append(new_list)

col = np.asarray(colours)
new_image = cv2.imwrite("rainbow.png",col)

它运行良好，直到最后一行.然后它给了我这个错误:

It runs well until the last line. Then it gives me this error:

OpenCV Error: Assertion failed (image.channels() == 1 || image.channels() == 3 || image.channels() == 4) in cv::imwrite_, file C:\projects\opencv-python\opencv\modules\imgcodecs\src\loadsave.cpp, line 600
Traceback (most recent call last):
  File "kormou.py", line 16, in <module>
    new_image = cv2.imwrite("rainbow.png",col)
cv2.error: C:\projects\opencv-python\opencv\modules\imgcodecs\src\loadsave.cpp:600: error: (-215) image.channels() == 1 || image.channels() == 3 || image.channels() == 4 in function cv::imwrite_

总的来说，我是一个初学者，所以我遗漏了一些非常明显的东西，但我在这里找不到类似的错误问题.

In generally I'm a beginner so it may be something very obvious which I'm missing but I haven't been able to find similar error question here.

推荐答案

你犯了一个非常小的错误.从以下工作代码中找出 -

There is this very minute mistake you are doing. Figure out from the following working code -

import cv2
import numpy as np

colours = []
numbers = []
a=0
for i in range(256):
    numbers.append(a)
    a+=1

for x in range(16):
    new_list = numbers[16*x:16*x+16]
    colours.append(new_list)

print colours
col = np.asarray(colours)
new_image_flag = cv2.imwrite("rain.png",col)

检查编辑是否有提示.

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