OpenCV 3 dependency - too big

[vfdev-5]

Hello,
I wonder if it would be possible to create a smaller opencv3 dependency, instead of the present one.
I needed to install rgbd_launch package, ros kinetic version, but when apt-get tells me that I need 425Mb of different packages, especially, qt5webkit, qtdeclarative5, qt5quickwiget, vtk and even libgdal-dev and so on... Checking the dependencies, we see that rgbd_launch depends indirectly on cv_bridge and image_transport and both depends on opencv3. No problem for dependencies on image format drivers, but qt5 and vtk dependencies which draw themself another bunch of dependencies, makes it too big.

Would it be better to have something like ros-kinetic-opencv3-core ros-kinetic-opencv3-highgui and other modules as for `opencv 2 ?

[vrabaud]

I totally agree with the principle but it would take quite some effort because OpenCV is not meant to be released by piece: having several packages would require the appropriate FindFoo.cmake files to be created (e.g. Findopencv-gui.cmake). I do not have the time to create such files but I have pinged the OpenCV team so that this feature lands at some point.

[StefanFabian]

Reviving this as the OpenCV 4 dependency is even bigger and it should be possible to use only the relevant opencv modules as exec depends.
I understand that it's kind of hard to reduce the build dependencies but I don't think it is necessary to also ship all of that with the debian package.
Currently it installs the following packages:

adwaita-icon-theme at-spi2-core autoconf automake autotools-dev cpp-8 dbus
  dbus-user-session dconf-gsettings-backend dconf-service dmsetup file
  fontconfig fontconfig-config fonts-dejavu-core gcc-8 gdal-data gfortran
  gfortran-8 gfortran-9 gir1.2-glib-2.0 glib-networking glib-networking-common
  glib-networking-services gsettings-desktop-schemas gstreamer1.0-plugins-base
  gtk-update-icon-cache hicolor-icon-theme humanity-icon-theme i965-va-driver
  ibverbs-providers intel-media-va-driver iso-codes javascript-common libaacs0
  libaec0 libaom0 libapparmor1 libargon2-1 libarmadillo9 libarpack2
  libatk-bridge2.0-0 libatk1.0-0 libatk1.0-data libatspi2.0-0 libavahi-client3
  libavahi-common-data libavahi-common3 libavcodec-dev libavcodec58
  libavformat-dev libavformat58 libavresample-dev libavresample4 libavutil-dev
  libavutil56 libbdplus0 libbluray2 libcaf-openmpi-3 libcairo-gobject2
  libcairo2 libcap2 libcap2-bin libcdparanoia0 libcfitsio8 libcharls2
  libchromaprint1 libcoarrays-dev libcoarrays-openmpi-dev libcodec2-0.9
  libcolord2 libcryptsetup12 libcups2 libdap25 libdapclient6v5 libdatrie1
  libdbus-1-3 libdc1394-22 libdc1394-22-dev libdconf1 libdevmapper1.02.1
  libdrm-amdgpu1 libdrm-common libdrm-intel1 libdrm-nouveau2 libdrm-radeon1
  libdrm2 libelf1 libepoxy0 libepsilon1 libevent-2.1-7 libevent-core-2.1-7
  libevent-dev libevent-extra-2.1-7 libevent-openssl-2.1-7
  libevent-pthreads-2.1-7 libexif-dev libexif-doc libexif12 libfabric1
  libfontconfig1 libfreetype6 libfreexl1 libfribidi0 libfyba0 libgcc-8-dev
  libgd3 libgdal26 libgdcm-dev libgdcm3.0 libgdk-pixbuf2.0-0
  libgdk-pixbuf2.0-bin libgdk-pixbuf2.0-common libgeos-3.8.0 libgeos-c1v5
  libgeotiff5 libgfortran-8-dev libgfortran-9-dev libgif7
  libgirepository-1.0-1 libgl1 libgl1-mesa-dri libgl2ps1.4 libglapi-mesa
  libglvnd0 libglx-mesa0 libglx0 libgme0 libgphoto2-6 libgphoto2-dev
  libgphoto2-l10n libgphoto2-port12 libgraphite2-3 libgsm1
  libgstreamer-plugins-base1.0-0 libgstreamer1.0-0 libgtk-3-0 libgtk-3-bin
  libgtk-3-common libharfbuzz0b libhdf4-0-alt libhdf5-103 libhdf5-openmpi-103
  libhwloc-dev libhwloc-plugins libhwloc15 libibverbs-dev libibverbs1 libice6
  libigdgmm11 libilmbase-dev libilmbase24 libip4tc2 libjbig-dev libjbig0
  libjpeg-dev libjpeg-turbo8 libjpeg-turbo8-dev libjpeg8 libjpeg8-dev
  libjs-jquery libjson-c4 libjson-glib-1.0-0 libjson-glib-1.0-common
  libkmlbase1 libkmldom1 libkmlengine1 libkmod2 liblcms2-2 liblept5 libllvm10
  libltdl-dev liblzma-dev libmagic-mgc libmagic1 libminizip1 libmp3lame0
  libmpg123-0 libnetcdf-c++4 libnetcdf15 libnl-3-200 libnl-3-dev
  libnl-route-3-200 libnl-route-3-dev libnspr4 libnss-systemd libnss3
  libnuma-dev libnuma1 libogdi4.1 libogg0 libopencv-calib3d-dev
  libopencv-calib3d4.2 libopencv-contrib-dev libopencv-contrib4.2
  libopencv-core-dev libopencv-core4.2 libopencv-dev libopencv-dnn-dev
  libopencv-dnn4.2 libopencv-features2d-dev libopencv-features2d4.2
  libopencv-flann-dev libopencv-flann4.2 libopencv-highgui-dev
  libopencv-highgui4.2 libopencv-imgcodecs-dev libopencv-imgcodecs4.2
  libopencv-imgproc-dev libopencv-imgproc4.2 libopencv-ml-dev libopencv-ml4.2
  libopencv-objdetect-dev libopencv-objdetect4.2 libopencv-photo-dev
  libopencv-photo4.2 libopencv-shape-dev libopencv-shape4.2
  libopencv-stitching-dev libopencv-stitching4.2 libopencv-superres-dev
  libopencv-superres4.2 libopencv-ts-dev libopencv-video-dev
  libopencv-video4.2 libopencv-videoio-dev libopencv-videoio4.2
  libopencv-videostab-dev libopencv-videostab4.2 libopencv-viz-dev
  libopencv-viz4.2 libopencv4.2-java libopencv4.2-jni libopenexr-dev
  libopenexr24 libopenjp2-7 libopenmpi-dev libopenmpi3 libopenmpt0 libopus0
  liborc-0.4-0 libpam-cap libpam-systemd libpango-1.0-0 libpangocairo-1.0-0
  libpangoft2-1.0-0 libpciaccess0 libpixman-1-0 libpmix2 libpng-dev
  libpng-tools libpng16-16 libpoppler97 libpq5 libproj15 libprotobuf17
  libproxy1v5 libpsm-infinipath1 libpsm2-2 libqhull7 libraw1394-11
  libraw1394-dev libraw1394-tools librdmacm1 librest-0.7-0 librsvg2-2
  librsvg2-common libsensors-config libsensors5 libshine3 libsigsegv2 libsm6
  libsnappy1v5 libsocket++1 libsoup-gnome2.4-1 libsoup2.4-1 libsoxr0
  libspatialite7 libspeex1 libssh-gcrypt-4 libsuperlu5 libswresample-dev
  libswresample3 libswscale-dev libswscale5 libsz2 libtbb-dev libtbb2
  libtesseract4 libthai-data libthai0 libtheora0 libtiff-dev libtiff5
  libtiffxx5 libtool libtwolame0 liburiparser1 libusb-1.0-0 libva-drm2
  libva-x11-2 libva2 libvdpau1 libvisual-0.4-0 libvorbis0a libvorbisenc2
  libvorbisfile3 libvpx6 libvtk6.3 libvulkan1 libwavpack1 libwayland-client0
  libwayland-cursor0 libwayland-egl1 libwebp6 libwebpmux3 libx11-xcb1
  libx264-155 libx265-179 libxcb-dri2-0 libxcb-dri3-0 libxcb-glx0
  libxcb-present0 libxcb-randr0 libxcb-render0 libxcb-shm0 libxcb-sync1
  libxcb-xfixes0 libxcomposite1 libxcursor1 libxdamage1 libxerces-c3.2
  libxfixes3 libxi6 libxinerama1 libxkbcommon0 libxnvctrl0 libxpm4 libxrandr2
  libxrender1 libxshmfence1 libxt6 libxtst6 libxvidcore4 libxxf86vm1
  libzvbi-common libzvbi0 m4 mesa-va-drivers mesa-vdpau-drivers
  mesa-vulkan-drivers networkd-dispatcher ocl-icd-libopencl1 odbcinst
  odbcinst1debian2 opencv-data openmpi-bin openmpi-common poppler-data
  proj-bin proj-data python3-dbus python3-gi shared-mime-info systemd
  systemd-sysv systemd-timesyncd ubuntu-mono ucf va-driver-all
  vdpau-driver-all x11-common xkb-data

These include multiple drivers and desktop libraries and require a total of 1200MB.