错误：.. \\ .. \\ .. \\ opencv-2.4.8 \\ modules \\ highgui \\ src \\ window.cpp：269：错误：（-215）size.width> 0 && size.height> 0在函数cv中： ：imshow

Question

when i run this code taken from this links http://docs.opencv.org/trunk/doc/py_tutorials/py_video/py_lucas_kanade/py_lucas_kanade.html they give the following code the give the following Error

Traceback (most recent call last):
File "C:\Python27\code\afan.py", line 48, in <module>
 cv2.imshow('frame',img)
error: ..\..\..\opencv-2.4.8\modules\highgui\src\window.cpp:269: error: (-215) size.width>0 && size.height>0 in function cv::imshow:        

Answer 1

Write

cv2.line(mask, (a,b),(c,d), color[i].tolist(), 2)
cv2.circle(frame,(a,b),5,color[i].tolist(),-1)

instead

mask = cv2.line(mask, (a,b),(c,d), color[i].tolist(), 2)
frame = cv2.circle(frame,(a,b),5,color[i].tolist(),-1)    

Answer 2

This error says that your img doesn't have a correct size (in accordance to error width or height is 0).

Check your image size.

Answer 3

Images has zero size just after creation. Thus your img is created, but is not initialized with any actual content. Make sure that video files from tutorial are present and correctly loaded.