Not the answer you're looking for? This function is located in opencv_imgcodecs library. Home Services Web Development . I modify the makefile as in https://github.com/BVLC/caffe/issues/1276, I add opencv_imgcodecs in make file bryanyzhu mentioned this issue on Mar 13, 2018 Already have an account? opencv by source: 3.4.5 opencv by yum: 2.4.5 yum install opencv) 1. Which values for window size and number of pyramids are reasonable for calcOpticalFlowPyrLK? What is an undefined reference/unresolved external symbol error and how do I fix it? What is an undefined reference/unresolved external symbol error and how do I fix it? The newer version of GCC will compile STD:: string as STD:: string in C + + 11:__cxx11::basic_string< char> At this time, if the third-party library you call does not enable the C + + 11 feature during compilation, the STD:: string in it . Solution. your android c++ libs might have somethong slightly different here). How do I put three reasons together in a sentence? To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. OpenCV get coordinates of red-only rectangle area, how to crop an image when detecting a straight line in python. When image processing functions are used, the GCC linker fails with undefined references to these functions. My CMakeLists.txt is as follows: cmake_minimum_required(VERSION 3.1.0) project(myImageProgram) set(CMAKE_PREFIX_PATH /home/marios-cellink/libtorch) find_package(OpenCV 4.0.0 REQUIRED) Undefined Reference Error (imread/imwrite) in Compiling xfOpenCV with SDSoc Hi all, I am trying to build the example rpject "lkdensepyrof" with the provided template of makefile. Also, the point of the timeout code was to answer @StevenPuttemans question that imread is indeed reading an image that isn't empty. 'cv::imwrite (cv::String const&, cv::_InputArray const&, std::__ndk1::vector<int, std::__ndk1::allocator<int> > const&) look at the last arg. In a normal CMake with opencv you would see something like "find_package(OpenCV REQUIRED)" Which will find the installed version of opencv and set the cmake variables. 1. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Is there a higher analog of "category with all same side inverses is a groupoid"? can you add the exact error msg to your question, please ? 46,044 Solution 1. Yeh this fix problem, more precisely add "-loopencv_core" or any lib like "-lopencv_(THE LIB OPENCV NAME HERE) undefined reference to `cv::imwrite()'. Manage SettingsContinue with Recommended Cookies. In pytyon is it possible to prevent the text's pixel while removing lines in image? They are in the same header file(using opencv version 3.4.1), but I get an undefined reference when trying to use imwrite, NOT imread. For example for mingw you need -lopencv_imgcodecs320 (for opencv 3.2.0). To learn more, see our tips on writing great answers. Currently I am using OpenCV 2.4.9.1, which is the default on Ubuntu 16.04. Concentration bounds for martingales with adaptive Gaussian steps. Downgrading 3.4 project to NDK16 enabled it to build, but it fails to run when including imread, and crash on app startup. The error looks similar to this: $ gcc undefined_reference.c /tmp/ccoXhwF0.o: In function `main': undefined_reference.c: (.text+0x15): undefined reference to `foo' collect2: error: ld returned 1 exit status $ So let's look at the code that generated this error: Then you will see it using this variables everywhere else that is needed, I believe this explains the problem and solution. Here we have only specified the prototype of function and then used it in the main function. 'cv::imwrite(cv::String const&, cv::_InputArray const&, std::__ndk1::vector
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