An error occurred when installing pyrealsense2 on ubuntu

• MartyG

  • August 27, 2020 06:00

  Hi B2992872  pip install of pyrealsense2 will not work on Jetson because it has an Arm processor chip, and the pyrealsense2 pip packages are for x86 / x64 processors like the ones in PCs.  The pyrealsense2 wrapper can be built from source code on Jetson.

  https://github.com/IntelRealSense/librealsense/tree/master/wrappers/python#building-from-source 

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• B2992872

  • August 27, 2020 06:08

  Hi @MartyG
  I have tried to build from the source, but an error occurred when I clicked three steps

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• MartyG

  • August 27, 2020 06:16
  • Edited

  Have you got the CMake program installed please?

  https://cmake.org/ 

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• B2992872

  • August 27, 2020 07:35

  Do you use the downloaded data to make CMake?
  

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• MartyG

  • August 27, 2020 07:57
  • Edited

  I believe that you go to the root librealsense directory of the librealsense SDK and do mkdir build && cd build to create a sub-folder named build (librealsense > build).  The command then changes the directory so that you are inside the build folder.

  Then input the CMake build command whilst in that build folder:

  cmake ../ -DBUILD_PYTHON_BINDINGS:bool=true

  Then after that, input these commands:

  make -j4

  sudo make install

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• B2992872

  • August 28, 2020 01:24

  After I tried to install cmake and update, an error occurred when I typed make mkdir build

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• MartyG

  • August 28, 2020 06:06
  • Edited

  The error message suggests that you are launching the build command from the /home/Nvidia/build directory.    If that is the case then you are not at the correct directory path (the instructions for building the pyrealsense2 wrapper from source are admittedly not clear about this). 

  If you have the librealsense SDK built then you should have a directory called librealsense or something similar.  This is the folder that the SDK files are in.  So you should enter this directory and use the command mkdir build && cd build to create a 'build' directory and navigate to it.   Then input the CMake build command.

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• B2992872

  • August 28, 2020 07:35

  I successfully updated cmake to version 3.18.2, and then executed mkdir build in the directory of librealsense. The first time I executed the error, the cmake version was too old, so I tried again after the update

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• MartyG

  • August 28, 2020 07:39
  • Edited

  After doing mkdir build in the librealsense directory to create the build folder, you have to use cd build to enter the build directory before running the CMake python bindings command.

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• B2992872

  • August 28, 2020 08:28

  Is cmake installed in the librealsense directory?

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• MartyG

  • August 28, 2020 09:06
  • Edited

  To the best of my knowledge, once CMake is installed somewhere on your computer then it should be accessible from anywhere.  You can download it for Linux as a pre-built "binary" file (cmake-3.18.2-Linux-x86_64.tar.gz)  that just installs when you run it, so you do not need to build CMake from source code.

  https://cmake.org/download/ 

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• B2992872

  • August 28, 2020 09:23

  I tried to update cmake in the librealsense directory to check that the version is still old, so the cmake command is still wrong

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• B2992872

  • September 09, 2020 13:36

  Can the fifth step be explained in detail?

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• Sheethal Ng

  • September 24, 2020 08:05

  Hi Marty

  Here is my requirement

  1. Initially the IR emitter will be turned off

  2. I need to then turn on the emitter and get depth frame

  3. Turn off the emitter and get IR frame

   

  I believe when we call pipeline.wait_for_frames(), we will get all the enabled streams with either emitter on or off

  Could u please tell me whether it is possible to get each individual stream with different emitter options ie ON/OFF??

   

  Thanks in advance

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• MartyG

  • September 24, 2020 08:53

  Hi Sheethal Ng  The IR Emitter (projector) is a separate physical camera component from the IR imager components.  It can be enabled / disabled independently of the current status of the depth, color and IMU streams.  So the IR Emitter is either On or Off, and you cannot set an individual on / off state for each individual stream type.

  If you are needing to remove the IR dot pattern projection from the IR image, the D415 camera model provides a Visual Preset (json) configuration file called Left Imager Color w/o IR Pattern that removes the pattern.  This pattern removal feature is also coming to the new D455 model in an upcoming firmware version.

  https://github.com/IntelRealSense/librealsense/tree/master/examples/sensor-control 

  The visibility of the dot pattern can also be reduced whilst keeping the IR Emitter on by reducing the value of the Laser Power option.  This can make the depth image more sparse in detail though.

  If you prefer to toggle the IR Emitter on-off then you can find example code to do so in the link below, under the librealsense2 heading:

  https://github.com/IntelRealSense/librealsense/wiki/API-How-To#controlling-the-laser 

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