OpenCV错误：bitwise_and抛出掩码和图像大小不同的错误

Question

我试图在python（3.6.5）中使用openCV（3.3.1）将一个掩码应用于图像以提取所有皮肤。我正在循环拍照并检查窗口并使用两个预制的sklearm GMM对它们进行分类。如果窗口是皮肤，我将掩码的区域更改为True（255），否则将其保留为0。

我已经初始化numpy数组以在循环之前保持掩码与图像的尺寸相同，但是openCV一直说图像和掩码没有相同的尺寸（输出和错误消息在下面）。我在网站上看到过其他类似的问题，但没有一个解决方案对我有用。

这是我的代码：

# convert the image to hsv
hsv = cv2.cvtColor(img, cv2.COLOR_BGR2HSV)
delta = 6
# create an empty np array to make the mask
#mask = np.zeros((img.shape[0], img.shape[1], 1))
mask = np.zeros(img.shape[:2])
# loop through image and classify each window
for i in range(0,hsv.shape[0],delta):
    for j in range(0,hsv.shape[1],delta):
        # get a copy of the window
        arr = np.copy(hsv[i:i+delta,j:j+delta,0])
        # create a normalized hue histogram for the window
        if arr.sum() > 0:
            arr = np.histogram(np.ravel(arr/arr.sum()), bins=100, range=(0,1))
        else:
            arr = np.histogram(np.ravel(arr), bins=100, range=(0,1))
        # take the histogram and reshape it
        arr = arr[0].reshape(1,-1)
        # get the probabilities that the window is skin or not skin
        skin = skin_gmm.predict_proba(arr)
        not_skin = background_gmm.predict_proba(arr)
        if skin > not_skin:
            # becasue the window is more likely skin than not skin
            # we fill that window of the mask with ones
            mask[i:i+delta,j:j+delta].fill(255)
# apply the mask to the original image to extract the skin
print(mask.shape)
print(img.shape)
masked_img = cv2.bitwise_and(img, img, mask = mask)

输出是：

(2816, 2112)
(2816, 2112, 3)
OpenCV Error: Assertion failed ((mtype == 0 || mtype == 1) && 
_mask.sameSize(*psrc1)) in cv::binary_op, file C:ciopencv_1512688052760
workmodulescoresrcarithm.cpp, line 241
Traceback (most recent call last):
File "skindetector_hist.py", line 183, in <module>
main()
File "skindetector_hist.py", line 173, in main
skin = classifier_mask(img, skin_gmm, background_gmm)
File "skindetector_hist.py", line 63, in classifier_mask
masked_img = cv2.bitwise_and(img, img, mask = mask)
cv2.error: C:ciopencv_1512688052760workmodulescoresrc
arithm.cpp:241: error: (-215) (mtype == 0 || mtype == 1) && 
_mask.sameSize(*psrc1) in function cv::binary_op

正如您在输出中看到的，图像和蒙版具有相同的宽度和高度。我也试过让面具有深度一（第5行），但这没有帮助。感谢您的任何帮助！