ch5 stereoVision.cpp运行错误，使用的是opencv3.4.11

[minghongss]

terminate called after throwing an instance of 'cv::Exception' what(): OpenCV(3.4.11) /home/hongss/opencv-3.4.11/modules/imgproc/src/median_blur.dispatch.cpp:283: error: (-215:Assertion failed) !_src0.empty() in function 'medianBlur'

[jacy-darker]

// 文件路径 读取图片时路径改为绝对路径即可，比如 string left_file = "/home/xxx/slambook2/ch5/stereo/left.png"; string right_file = "/home/xxx/slambook2/ch5/stereo/right.png";