CV_16FC1/C3 Missing

OpenCV AI Kit (OAK)
,
1

The GitHub repo for depthai-core is missing definitions for CV_16FC1/C3. OpenCV has never had any 16-bit float formats so this is new code. The cases for CV_16FC1/C3 look like they can just be commented out as they are not likely to be used. There is a lot of active development in the repo so I may have just cloned the repo at a bad time. Please advise…

2

uhh, 3rdparty problem
(don’t expect anyone here to be familiar with it)

not entirely true. (added in 4.x but only used within the dnn code)

now what are you talking about ? links ? example code ?
please be more concise

and: opencv version ?

3

The repo with the problem is here:

The camera that the code supports is the OpenCV Oak-D RGBZ camera. If you clone that repo, run CMake, and build the resulting .sln, you will see the error. OpenCV has no CV_16FC1/C3 support and this code assumed it did. This is not a third-party problem as Luxonis is supporting the Oak-D camera. If you would like to give it a try, this code with show the error when running on Windows 10.

if exist depthai-core (rmdir depthai-core /s)
“c:\Program Files\Git\bin\git.exe” clone “GitHub - luxonis/depthai-core: DepthAI C++ Library”
cd depthai-core
git submodule update --init --recursive
cd …
“C:\Program Files\CMake\bin\Cmake.exe” -DCMAKE_CONFIGURATION_TYPES=Debug;Release -DDEPTHAI_BUILD_EXAMPLES=ON -DOpenCV_DIR=…/opencv/Build -S depthai-core -B depthai-core/Build
msbuild.exe depthai-core/Build/depthai.sln /p:Configuration=Debug
msbuild.exe depthai-core/Build/depthai.sln /p:Configuration=Release

4

that’s far too broad. please locate problem closer.

it’s unclear, how you get to that conclusion
and again, which opencv version are you talking about ?

5

4.5.3 - the latest version of OpenCV.

6

please provide some compiler messages that show the issue. you know how bug reports work.

7

The email editor added the extra dot in my .bat file in the earlier email. The version of the OpenCV that is up one directory from the depthai-core is 4.5.3 and the CV_16FC1/C3 are both defined there.

"C:\_src\OpenCVB\depthai-core\Build\depthai.sln" (default target) (1) ->
"C:\_src\OpenCVB\depthai-core\Build\ALL_BUILD.vcxproj.metaproj" (default target) (2) ->
"C:\_src\OpenCVB\depthai-core\Build\examples\bootloader_version.vcxproj.metaproj" (default target) (4) ->
"C:\_src\OpenCVB\depthai-core\Build\depthai-opencv.vcxproj.metaproj" (default target) (9) ->
"C:\_src\OpenCVB\depthai-core\Build\depthai-opencv.vcxproj" (default target) (10) ->
(ClCompile target) ->
C:\_src\OpenCVB\depthai-core\src\opencv\ImgFrame.cpp(44,20): error C2065: 'CV_16FC1': undeclared identifier [C:\_src\
OpenCVB\depthai-core\Build\depthai-opencv.vcxproj]
C:\_src\OpenCVB\depthai-core\src\opencv\ImgFrame.cpp(57,20): error C2065: 'CV_16FC3': undeclared identifier [C:\_src\
OpenCVB\depthai-core\Build\depthai-opencv.vcxproj]

24 Warning(s)
2 Error(s)
8

I have figured out the problem. It is rooted in the CMake script used to prepare the depthai-core tree. Even though the script explicitly calls for CMake to use -DOpenCV_DIR=…/opencv/Build, the command line for CMake searches nearby directories for a version of OpenCV and found an old version without the CV_16FC1/C3 definitions. It only became clear when using CMake-gui and the OpenCV_Dir was incorrectly defined. Changing it in CMake-gui fixes the problem with the luxonis code. Sorry for all the trouble but it helped to get past the problem with CMake. Thanks.