2017-02-13 11:22:41 -0600 | answered a question | Python & OpenCV 3.1: imshow fail when called in different thread Hi, the imshow function is not thread safe. A thread must acquire a lock before showing the image and release it afer the specified time in the waitKey function has passed. In python is really easy, define a lock in your code and add in the run method of your thread: Hope it'll help. |