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Hi, i am trying to extract text from image but after compiling its showing an error.

ERROR IS OpenCV Error: Assertion failed (!_src.empty()) in cv::pyrDown_, file C:\build\master_winpack-bindings-win64-vc14-static\opencv\modules\imgproc\src\pyramids.cpp, line 858

Hi, i am trying to extract text from image but after compiling its showing an error.

ERROR IS OpenCV Error: Assertion failed (!_src.empty()) in cv::pyrDown_, file C:\build\master_winpack-bindings-win64-vc14-static\opencv\modules\imgproc\src\pyramids.cpp, line 858