error: ‘CV_BGR2GRAY’ was not declared in this scope

[fatbringer]

After running succesfully

cmake .. -DADVANCED_SENSING=ON -DTARGET_TRACKING_SAMPLE=ON 

I am unable to perform sudo make -j7 install Error returned is

sudo make -j7 install
[ 13%] Built target advanced-sensing
[ 32%] Built target djiosdk-core
[ 35%] Built target djiosdk-waypoint-v2-sample
[ 38%] Built target djiosdk-mission-sample
[ 40%] Built target djiosdk-mfio-sample
[ 43%] Built target djiosdk-flightcontrol-sample
[ 45%] Built target djiosdk-telemetry-sample
[ 48%] Built target djiosdk-logging-sample
[ 51%] Built target djiosdk-mobile-sample
[ 54%] Built target time_sync_poll_sample
[ 59%] Built target payloads_async_sample
[ 61%] Built target time_sync_callback_sample
[ 63%] Built target stereo-vision-single-thread-sample
[ 68%] Built target payloads_sync_sample
[ 71%] Built target djiosdk-payload-control-sample
[ 75%] Built target payloads_download_sample
[ 77%] Built target stereo-vision-new-sample
[ 79%] Built target camera-stream-poll-sample
[ 82%] Built target stereo-vision-multi-thread-sample
[ 84%] Built target camera-stream-callback-sample
[ 84%] Building CXX object sample/platform/linux/advanced-sensing/camera_stream_target_tracking_sample/CMakeFiles/kcf_tracker.dir/KCFcpp/src/kcftracker.cpp.o
[ 86%] Built target djiosdk-hms-sample
[ 88%] Built target djiosdk-liveview-sample
[ 90%] Built target op_upload_sample
[ 92%] Built target djiosdk-battery-sample
[ 94%] Built target om_download_sample
[ 96%] Built target op_download_sample
In file included from /home/dji/Desktop/djiOSDK/src/Onboard-SDK-4.1.0/sample/platform/linux/advanced-sensing/camera_stream_target_tracking_sample/KCFcpp/src/kcftracker.cpp:86:0:
/home/dji/Desktop/djiOSDK/src/Onboard-SDK-4.1.0/sample/platform/linux/advanced-sensing/camera_stream_target_tracking_sample/KCFcpp/src/recttools.hpp: In function ‘cv::Mat RectTools::getGrayImage(cv::Mat)’:
/home/dji/Desktop/djiOSDK/src/Onboard-SDK-4.1.0/sample/platform/linux/advanced-sensing/camera_stream_target_tracking_sample/KCFcpp/src/recttools.hpp:132:28: error: ‘CV_BGR2GRAY’ was not declared in this scope
     cv::cvtColor(img, img, CV_BGR2GRAY);
                            ^~~~~~~~~~~
sample/platform/linux/advanced-sensing/camera_stream_target_tracking_sample/CMakeFiles/kcf_tracker.dir/build.make:86: recipe for target 'sample/platform/linux/advanced-sensing/camera_stream_target_tracking_sample/CMakeFiles/kcf_tracker.dir/KCFcpp/src/kcftracker.cpp.o' failed
make[2]: *** [sample/platform/linux/advanced-sensing/camera_stream_target_tracking_sample/CMakeFiles/kcf_tracker.dir/KCFcpp/src/kcftracker.cpp.o] Error 1
CMakeFiles/Makefile2:1350: recipe for target 'sample/platform/linux/advanced-sensing/camera_stream_target_tracking_sample/CMakeFiles/kcf_tracker.dir/all' failed
make[1]: *** [sample/platform/linux/advanced-sensing/camera_stream_target_tracking_sample/CMakeFiles/kcf_tracker.dir/all] Error 2
Makefile:129: recipe for target 'all' failed
make: *** [all] Error 2

Previously I have not encounter this issue with OSDK 4.1.0 I have always use OSDK 4.1.0. Opencv version

dpkg -l | grep libopencv
ii  libopencv                                     4.1.1-2-gd5a58aa75                               arm64        Open Computer Vision Library
ii  libopencv-dev                                 4.1.1-2-gd5a58aa75                               arm64        Development files for Open Source Computer Vision Library
ii  libopencv-python                              4.1.1-2-gd5a58aa75                               arm64        Python bindings for Open Source Computer Vision Library
ii  libopencv-samples                             4.1.1-2-gd5a58aa75                               arm64        Samples for Open Source Computer Vision Library

[dji-dev]

Agent comment from DJI SDK in Zendesk ticket #57262:

尊敬的开发者，感谢您联系DJI 大疆创新 由于github不是我们主要的咨询渠道，您的问题可能跟进不及时。我们建议您通过填写表单（ https://djisdksupport.zendesk.com/hc/zh-cn/requests/new ）向我们反馈问题。或者您也可以在论坛发帖，与其它开发者交流。论坛链接：https://djisdksupport.zendesk.com/hc/zh-cn/community/topics

Dear developer, thank you for contacting DJI. Since github is not our main consultation channel, your questions may not be followed up in time. We recommend that you fill in the form (https://djisdksupport.zendesk.com/hc/en-us/requests/new) to report problems to us. Or you can post in the forum to communicate with other developers. Forum link: https://djisdksupport.zendesk.com/hc/zh-cn/community/topics

°°°

[dji-dev]

Agent comment from kyle.cai in Zendesk ticket #57262:

Dear developer ,

Thank you for contacting DJI.

OSDK sample third-party libs, please refer to the following link: https://sdk-forum.dji.net/hc/en-us/articles/900006035306-The-OSDK-sample-compile-error-reports-that-the-lib-and-header-files-cannot-be-found-

OSDK sample based on opencv 3.3.1 and opencv-contrib 3.3.1

Thank you for your understanding and support, hope you have a nice day.

Best Regards, DJI SDK Support Team

°°°

[fatbringer]

@dji-dev hi thanks for replying. Yes i went to check and indeed there was an opencv version error. I had re-install opencv 3.3.1 and now it is ok.

Is there future version where it use opencv 4 ?

Also, when trying out target tracking example, if target go behind a wall, the tracker stop working. What can we do to make it restart tracking ?

Thank you

[dji-dev]

Agent comment from kyle.cai in Zendesk ticket #57262:

Dear developer ,

Thank you for contacting DJI.

Sorry，OSDK 4.1 will stop updating new functions and will not adapt to opencv 4 in the future. In fact, opencv is used for the sample functions, and developers can adapt opencv 4.x to develop OSDK applications.

Thank you for your understanding and support, hope you have a nice day.

Best Regards, DJI SDK Support Team

°°°

[highfreq]

Really sad a company this big has so poor support for devs. What trouble could it be to adapt sample to OpenCV 4...............really really sad DJI cares so little about devs. It look like DJI doesn't really like people to dev on their products.

[fatbringer]

Hi @dji-dev for OSDK, is it possible to run the OSDK and OSDK ROS on other embedded computer platform such as NVIDIA AGX Xavier ? Instead of NVIDIA jetson tx2 like the DJI Manifold 2G ?

[SilaLiu]

修改方法为：将CV_BGR2GRAY改为cv::COLOR_BGR2GRAY