这是我的代码：
frame_gray = cv2.cvtColor(cv2.imread('image.jpg'), cv2.COLOR_BGR2GRAY)
edge_mask = np.ones((457, 702))
cv2.rectangle(edge_mask, (15, 15), (687, 442), 0, cv2.FILLED)
p_add = cv2.goodFeaturesToTrack(frame_gray, mask=edge_mask, maxCorners=50, qualityLevel=0.3, minDistance=5, blockSize=7)
这是错误：
OpenCV Error: Assertion failed (_mask.empty() || (_mask.type() == (((0) & ((1 << 3) - 1)) + (((1)-1) << 3)) && _mask.sameSize(_image))) in goodFeaturesToTrack, file /Users/travis/build/skvark/opencv-python/opencv/modules/imgproc/src/featureselect.cpp, line 366
Traceback (most recent call last):
File "test.py", line 59, in <module>
frame_gray, mask=edge_mask, maxCorners=50, qualityLevel=0.3, minDistance=5, blockSize=7)
cv2.error: /Users/travis/build/skvark/opencv-python/opencv/modules/imgproc/src/featureselect.cpp:366: error: (-215) _mask.empty() || (_mask.type() == (((0) & ((1 << 3) - 1)) + (((1)-1) << 3)) && _mask.sameSize(_image)) in function goodFeaturesToTrack
frame_gray和edge_mask都具有（457，702）的形状，因为我不理解“（（（（0）＆（（1 << 3）-1））+（（（（1）- 1）<< 3））“之类的东西，所以我不知道出了什么问题