OpenCV错误-cv2.cvtcolor [英] OpenCV error - cv2.cvtcolor

问题描述

我是openCV的新手，但我一直无法解决此错误.我正在尝试使用此代码将图像从BGR转换为灰度格式-

I am a newbie to openCV and I am stuck at this error with no resolution. I am trying to convert an image from BGR to grayscale format using this code-

img = cv2.imread('path//to//image//file')
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)

这似乎工作正常.我检查了img变量的数据类型，该数据类型原来是numpy ndarray，形状是(100,80,3).但是，如果给出的图像已经存在于numpy ndarray数据类型的代码中，并且尺寸与cvtColor函数的输入相同，它将给我以下错误-

This seems to be working fine. I checked the data type of the img variable which turns out to be numpy ndarray and shape to be (100,80,3). However if I give an an image already present in code of numpy ndarray data type and of same dimensions as input to the cvtColor function, it gives me the following error-

Error: Assertion failed (depth == 0 || depth == 2 || depth == 5) in cv::cvtColor, file D:\Build\OpenCV\opencv-3.4.1\modules\imgproc\src\color.cpp, line 11109
cv2.error: OpenCV(3.4.1) D:\Build\OpenCV\opencv-3.4.1\modules\imgproc\src\color.cpp:11109: error: (-215) depth == 0 || depth == 2 || depth == 5 in function cv::cvtColor

第二种情况的代码是(在此处创建自定义np.ndarray)-

The code for the second case is (making a custom np.ndarray over here)-

img = np.full((100,80,3), 12)
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY) 

任何人都可以澄清此错误的原因以及如何纠正该错误吗?

Can anyone clarify what is the reason for this error and how to rectify it?

推荐答案

这是因为您的numpy数组不是由正确的数据类型组成的.默认情况下，数组类型为np.int64(64位)，但是cv2.cvtColor()需要8位(np.uint8)或16位(np.uint16).要解决此问题，请更改您的np.full()函数以包括数据类型:

This is because your numpy array is not made up of the right data type. By default makes an array of type np.int64 (64 bit), however, cv2.cvtColor() requires 8 bit (np.uint8) or 16 bit (np.uint16). To correct this change your np.full() function to include the data type:

img = np.full((100,80,3), 12, np.uint8)

这篇关于OpenCV错误-cv2.cvtcolor的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！