imread 返回 None，违反了函数“cvtColor"错误中的断言 !_src.empty() [英] imread returns None, violating assertion !_src.empty() in function 'cvtColor' error

问题描述

我正在尝试在 python 中进行基本的颜色转换，但是我似乎无法克服以下错误.我重新安装了 python、opencv，并在 python 3.4.3(最新)和 python 2.7(在我的 Mac 上)上都试过了.

I am trying to do a basic colour conversion in python however I can't seem to get past the below error. I have re-installed python, opencv and tried on both python 3.4.3 (latest) and python 2.7 (which is on my Mac).

我使用 python 的包管理器 opencv-python 安装了 opencv.

I installed opencv using python's package manager opencv-python.

这是失败的代码:

frame = cv2.imread('frames/frame%d.tiff' % count)
frame_HSV= cv2.cvtColor(frame,cv2.COLOR_RGB2HSV)

这是错误信息:

cv2.error: OpenCV(3.4.3) /Users/travis/build/skvark/opencv-python/opencv/modules/imgproc/src/color.cpp:181: error: (-215:Assertion failed) !_src.empty() in function 'cvtColor'

推荐答案

发生此错误是因为图像未正确加载.所以前一行 cv2.imread 有问题.我的建议是:

This error happened because the image didn't load properly. So you have a problem with the previous line cv2.imread. My suggestion is :

• 检查图像是否存在于您提供的路径中

• check if the image exists in the path you give

检查计数变量是否有有效数字

check if the count variable has a valid number

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