[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
這是我的代碼中出現問題的部分。 它應該計算圖片中綠色像素的數量:
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 標志)
你應該使用:
imgg = cv2.imread('path.tif', 1)
圖像已使用 PIL 讀取。現在 img 為數組格式,因此您無法再次讀取它。以 pil 或 cv2 的任何一種格式讀取文件
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))
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