ZCU104 video capture with opencv library issue???

[litaoqiyanjie]

I would like to capture video with cv::videocapture cap(0) function, and then do the image processing. 

The code like this:

#include<opencv2/core/core.hpp>
#include<opencv2/highgui/highgui.hpp>
#include<opencv2/video/video.hpp>

cv::VideoCapture cap(0);

However, the following errors pop up when I compile the code:

C:/taosdsoc/tao_hog/test/tao_test/Release/src/xf_hog_descriptor_tb.o: In function `main':
xf_hog_descriptor_tb.cpp:(.text.startup+0x74): undefined reference to `cv::VideoCapture::VideoCapture()'
xf_hog_descriptor_tb.cpp:(.text.startup+0x80): undefined reference to `cv::VideoCapture::open(int)'
xf_hog_descriptor_tb.cpp:(.text.startup+0x9ac): undefined reference to `cv::VideoCapture::~VideoCapture()'
xf_hog_descriptor_tb.cpp:(.text.startup+0x9e4): undefined reference to `cv::VideoCapture::~VideoCapture()'

I am not sure what is reason for the errors?

Thank you in advance.

[nutang]

Hi,

It is unable to find API declaration.

Please check your include path.

C/C++ settings->C/C++ General->Paths and symbols

check for warning sign on include paths

Best Regards,

Nutan

[litaoqiyanjie]

Hi nutang,  thanks for your message!

Here is the error message!

collect2.exe: error: ld returned 1 exit status
ERROR: [SdsCompiler 83-5019] Exiting sds++ : Error when calling 'aarch64-linux-gnu-g++ 

the compile pops up errors when calling aarch64-linux-gnu-g++

[lulugay · Accepted solution]

It seems that you didn't link OpenCV in project settings, 

[litaoqiyanjie]

Hi lulugay,

Thanks for your reply. 

The solution perfectly works for my project. 

[twlee2]

Hello,

I was having the same problem and followed the solution but I am still having a linker problem as following

H:/Xilinx/work/zed_test/src/main.cpp:13: undefined reference to `cv::VideoCapture::retrieve(cv::Mat&, int)'
H:/Xilinx/work/zed_test/src/main.cpp:14: undefined reference to `cv::_InputArray::_InputArray(cv::Mat const&)'
H:/Xilinx/work/zed_test/src/main.cpp:14: undefined reference to `cv::imshow(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, cv::_InputArray const&)'

Could you please provide some details of how you have solved this issue?

I am using zcu102 with SDSoC (2017.4) in windows 10.