![](/img/trans.png)
[英]cv2.imread error:img = cv2.imread(0) SystemError: <built-in function imread> returned NULL without setting an error
[英]Using cv2.imread: “<built-in function imread> returned NULL without setting an error”, as if it can't open the picture or get the data
这是我的代码中出现问题的部分。 它应该计算图片中绿色像素的数量:
img = Image.open('path.tif')
BLACK_MIN = np.array([0, 20, 20], np.uint8)
BLACK_MAX = np.array([120, 255, 255], np.uint8)
imgg = cv2.imread(img, 1)
dst = cv2.inRange(imgg, BLACK_MIN, BLACK_MAX)
no_black = cv2.countNonZero(dst)
print('The number of black pixels is: ' + str(no_black))
You are passing a PIL image to imread but it expects a filepath ( https://docs.opencv.org/2.4/modules/highgui/doc/reading_and_writing_images_and_video.html?highlight=imread#Mat%20imread(const%20string&%20filename, %20int%20 标志)
你应该使用:
imgg = cv2.imread('path.tif', 1)
图像已使用 PIL 读取。现在 img 为数组格式,因此您无法再次读取它。以 pil 或 cv2 的任何一种格式读取文件
BLACK_MIN = np.array([0, 20, 20], np.uint8)
BLACK_MAX = np.array([120, 255, 255], np.uint8)
imgg = cv2.imread('path.tif', 1)
dst = cv2.inRange(imgg, BLACK_MIN, BLACK_MAX)
no_black = cv2.countNonZero(dst)
print('The number of black pixels is: ' + str(no_black))
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.