opencv

USE flags

• abi_mips_n32 - 64-bit (32-bit pointer) libraries
• abi_mips_n64 - 64-bit libraries
• abi_mips_o32 - 32-bit libraries
• abi_s390_32 - 32-bit (s390) libraries
• abi_s390_64 - 64-bit (s390x) libraries
• abi_x86_32 - 32-bit (x86) libraries
• abi_x86_64 - 64-bit (amd64) libraries
• abi_x86_x32 - x32 ABI libraries
• contrib - Install user contributed scripts from opencv_contrib (Experimental!)
• contribcvv - CVV module requires Qt5
• contribdnn - DNN module contrib requires tiny dnn
• contribfreetype - Enable Drawing UTF-8 strings with freetype/harfbuzz
• contribhdf - HDF module requires sci-libs/hdf5
• contribovis - Enable Ogre vision module support
• contribsfm - SFM module requires eigen, gflags, and glog
• contribxfeatures2d - Enables xfeatures2d and autodownload of samples in contrib
• cpu_flags_arm_neon - Use the NEON (ASIMD) instruction set
• cpu_flags_arm_vfpv3 - Use the VFP version 3 instruction set
• cpu_flags_ppc_vsx - Use the Vector Scalar Extension instruction set (POWER7 and later)
• cpu_flags_ppc_vsx3 - Use the Vector Scalar Extension v.3 instruction set (POWER9 and later)
• cpu_flags_x86_avx - Adds support for Advanced Vector Extensions instructions
• cpu_flags_x86_avx2 - Adds support for Advanced Vector Extensions 2 instructions
• cpu_flags_x86_avx512f - Adds support for AVX-512 Foundation instructions
• cpu_flags_x86_f16c - Adds support for F16C instruction set for converting between half-precision and single-precision floats
• cpu_flags_x86_fma3 - Use the Fused Multiply Add 3 instruction set ([fma] in cpuinfo)
• cpu_flags_x86_popcnt - Enable popcnt instruction support ([abm] or [popcnt] in cpuinfo)
• cpu_flags_x86_sse - Use the SSE instruction set
• cpu_flags_x86_sse2 - Use the SSE2 instruction set
• cpu_flags_x86_sse3 - Use the SSE3 instruction set ([pni] in cpuinfo, NOT ssse3)
• cpu_flags_x86_sse4_1 - Enable SSE4.1 instruction support
• cpu_flags_x86_sse4_2 - Enable SSE4.2 instruction support
• cpu_flags_x86_ssse3 - Use the SSSE3 instruction set (NOT sse3/pni)
• cuda - Enable NVIDIA Cuda computations support (Experimental!)
• debug - Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see https://wiki.gentoo.org/wiki/Project:Quality_Assurance/Backtraces
• dnnsamples - Download dnn caffeemodel samples
• download - Enable download during cmake configure
• eigen - Enable usage of dev-cpp/eigen for computations
• examples - Install examples, usually source code
• features2d - Enable features2d module
• ffmpeg - Enable ffmpeg/libav-based audio/video codec support
• gdal - Enable support for sci-libs/gdal library
• gflags - Use Google's C++ argument parsing library
• glog - Use Google's C++ loggin library
• gphoto2 - Add digital camera support
• gstreamer - Add support for media-libs/gstreamer (Streaming media)
• gtk3 - Enable x11-libs/gtk+:3 support
• ieee1394 - Enable FireWire/iLink IEEE1394 support (dv, camera, ...)
• java - Add support for Java
• jpeg - Add JPEG image support
• jpeg2k - Support for JPEG 2000, a wavelet-based image compression format
• lapack - Add support for the virtual/lapack numerical library
• lto - Build using Link Time Optimizations (LTO)
• opencl - Add support for OpenCL
• opencvapps - Enable compilation with opencvapps
• openexr - Support for the OpenEXR graphics file format
• opengl - Add support for OpenGL (3D graphics)
• openmp - Build support for the OpenMP (support parallel computing), requires >=sys-devel/gcc-4.2 built with USE="openmp"
• png - Add support for libpng (PNG images)
• python - Add optional support/bindings for the Python language
• python_targets_python3_10 - Build with Python 3.10
• python_targets_python3_11 - Build with Python 3.11
• python_targets_python3_9 - Build with Python 3.9
• qt5 - Add support for the Qt 5 application and UI framework
• tesseract - Use Google's OCR Engine
• testprograms - Build and install programs for testing OpenCV (performance)
• threads - Add threads support for various packages. Usually pthreads
• tiff - Add support for the TIFF image format
• v4l - Enable support for video4linux (using linux-headers or userspace libv4l libraries)
• vaapi - Enable Video Acceleration API for hardware decoding
• vtk - Build new 3D visualization module viz based on sci-libs/vtk
• webp - Add support for the WebP image format
• xine - Add support for the XINE movie libraries

Security Advisory