[英]Scikit image otsu thresholding producing zero threshold
I am doing some preprocessing on an image, After applying Otsu thresholding on the image I am getting zero threshold while on another image it's working fine我正在对图像进行一些预处理,在图像上应用Otsu 阈值处理后,我的阈值为零,而在另一个图像上它工作正常
from skimage import filters
from skimage.io import imread
img = imread(img_path, as_gray=True)
threshold = filters.threshold_otsu(img)
print(threshold)
Threshold : 0阈值:0
original_1_1.png original_1_1.png
Threshold : 204门槛:204
That is the correct result.那是正确的结果。 Your image is bi-level, it only has values of 0 and 255, so 0 is a threshold that will split the image into two values correctly when you do the next step:
您的图像是双层的,它只有 0 和 255 的值,所以 0 是一个阈值,当您执行下一步时,它将正确地将图像分成两个值:
threshold = filters.threshold_otsu(img)
binary = im > threshold
Try it for yourself with some dummy "images" :用一些虚拟的“图像”自己尝试一下:
filters.threshold_otsu(np.array([0,255],dtype=np.uint8))
0
filters.threshold_otsu(np.array([7,12],dtype=np.uint8))
7
filters.threshold_otsu(np.array([7,8,11,12],dtype=np.uint8))
8
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