KL720 Dongle webcam example error

Comments

• Otis Hsieh

  January 2022

  Hi shao-xuan lin,

  Maybe your environment does not have OpenCV installed. Please make sure you install it and set up the environment variable.

  You can see the reference here: http://doc.kneron.com/docs/#plus/introduction/install_dependency/

  

  
  

  If you have already done it, but it still can not find the OpenCV-related files, you can try this method :

  Find out and execute C:\msys64\msys2_shell.cmd instead of msys2.exe, and then execute camera-related app

  

  Thanks!
• shao-xuan lin

  January 2022

  Hi Otis Hsieh

  I have already installed the path of opencv and environment variables. Today, I opened kl720_demo_cam_app_yolo_inference.exe directly with the system administrator. There are several errors, and there is no response in msys_shell.cmd

  

  無法找到程式輸入點 (Unable to find program entry point)

  在動態連結程式庫 (in the dynamic link library)

  

  

  

  

  
  

  Thank you for your help
• Otis Hsieh

  January 2022 edited January 2022

  Hi shao-xuan lin,

  Please try this: open your command line and execute C:\msys64\msys2_shell.cmd -mingw.

  It is not related with system administrator.

  Make sure your environment value / path have been set, and rebuild your code.

  

  Thanks.
• Gábor Simor

  February 2022

  Hi!

  I've got similar problem, when I want to run kl720_demo_cam_generic_inference_drop_frame.exe demo program on win10 enviroment. I've used the kneron_plus_v1.3.0.zip source. I built opencv according to the linked description bellow:

  http://doc.kneron.com/docs/#plus_c/introduction/install_dependency/#2-windows-10

  It's succesfull build, but when I run kl720_demo_cam_generic_inference_drop_frame.exe from the msys2_shell.cmd console window there is nothing happen

  

  If I run the program from windows console, then I've got the following error

  

  What might be the problem?

  Thanks!
• shao-xuan lin

  February 2022

  Otis Hsieh After that, I solved the problem that ubuntu could not be successfully built in https://www.itread01.com/content/1546257559.html. The reason for the failure was that opencv was not successfully installed.
• Gábor Simor

  February 2022

  Hi shao-xuan lin!

  Do you remember how you did built it exactly? That link which you wrote contanins opencv 3.4.1, in the Kneron doc contains opvecv 3.4.7

  http://doc.kneron.com/docs/#plus_c/introduction/install_dependency/#2-windows-10

  Did you use opencv 3.4.1 version or different opencv version?

  Thanks for your help!
• Gábor Simor

  February 2022

  Hi!

  I tried to build opencv 3.4.1 from source, but it failed. The build process runs into an error:

  

  I also tried the prebuild opencv 3.4.1 package that can be downloaded from the kneron site:

  

  https://www.kneron.com/support/developers/?folder=Documentation%20center/&download=457

  but it doesn't work well. With the prebuild opencv package I can build kneron plus examples but when I run the program from console, I've got error messages which is libopenblas.dll missing.

  
  

  Anybody has any idea, how could use kenron with opencv?

  
  

  Thanks
• PowHuang

  February 2022

  Hi Gábor Simor

  I tested two opcv and all workable.

  1.Follow document to build Opencv_347 and set Environment Variables.

  Install Dependency - Document Center (kneron.com)

  2.download open_341 zip from this link. It don't need to build.

  huihut/OpenCV-MinGW-Build at OpenCV-3.4.1-x64 (github.com)

  I move the files to opencv_341

  

  To build kneron_plus with opev example need opencv cmake files. It can find in opencv_341\x64\mingw\lib

  So you need to set Environment Variables -> System Variables

  ADD OpenCV_DIR === opencv_341\x64\mingw\lib

  And ADD Path === opencv_341\x64\mingw\bin

  

  
  

  After setting Environment Variables , must close and re-execute MinGW.

  Delet the old data in kneron_plus\build ,

  build > cmake -DWITH_OPENCV=ON .. -G"MSYS Makefiles"

  Then Run the examples
• Gábor Simor

  February 2022

  Hi PowHuang!

  I tried the 2nd option (using prebuild library) which you wrote and now it's working fine! :-) I don't understand why it didn't work before. I made build process according to the documentation:

  http://doc.kneron.com/docs/#plus_c/introduction/install_dependency/#2-windows-10

  Thank you for your helping!