libXCam相机功能扩展开发库-技术圈

libXCam是一个扩展相机功能的项目，专注于图像质量改进和视频分析。图像预处理，图像后处理和智能分析支持许多功能。该库使GPU / CPU / ISP协同工作以提高图像质量。 OpenCL用于提高不同平台的性能。

主要特性：

Image processing features
- Advanced features
  - Automotive surround view(360) stitching (OpenCL/CPU/GLES)
    - Support bowl view 3D model stitching by 4 video input.
    - Enable geometry remap for WFoV camera calibration(intrinsic and extrinsic data).
    - Quality and performance improved (OpenCL/CPU/GLES).
    - CPU version upstreamed into AOSP for automotive surround view.
    - Enable Vulkan to improve performance.
  - 360 video stitching (Equirectangular mode via OpenCL)
    - Support 2-fisheye (>180 degree) video stream stitching.
    - Performance and quality improved.
  - DNN inference framework
    - Support pedestrian and vehicle detection.
  - Digital Video Stabilization
    - OpenCV feature-matched based video stabilization.
    - gyroscope 3-DoF (orientation) based video stabilization.
  - Blender: multi-band blender (OpenCL/CPU/GLES)
  - Noise reduction (OpenCL)
    - adaptive NR based on wavelet-haar and Bayersian shrinkage.
    - 3D-NR with inter-block and intra-block reference.
    - wavelet-hat NR (obsolete).
  - Wide dynamic range (WDR) (OpenCL)
    - histogram adjustment tone-mapping.
    - gaussian-based tone-mapping (obsolete).
  - Fog removal: retinex and dark channel prior algorithm (OpenCL)
    - dark channel prior algorithm based defog.
    - multi-scale retinex based defog (obsolete).
- Basic pipeline from bayer to YUV/RGB format (OpenCL / AtomISP)
  - Gamma correction, MACC, color space, demosaicing, simple bilateral noise reduction, edge enhancement and temporal noise reduction.
- 3A features
  - Auto whitebalance, auto exposure, auto focus, black level correction, color correction, 3a-statistics calculation.
Support 3rd party 3A lib which can be loaded dynamically
- hybrid 3a plugin.
Support 3a analysis tuning framework for different features
Support smart analysis framework
- Face detection interface/plugin.
Enable gstreamer plugin
- xcamsrc, capture from usb/isp camera, process 3a/basic/advanced features.
- xcamfilter, improve image quality by advanced features and smart analysis.

环境要求：

install gcc/g++, automake, autoconf, libtool, gawk, pkg-config
Linux kernel > 3.10
install ocl-icd-dev, ocl-icd-opencl-dev
If --enable-gst, need install libgstreamer1.0-dev, libgstreamer-plugins-base1.0-dev
If --enable-aiq, need get ia_imaging lib which we don't support
If --enable-libcl, need compile or install OpenCL driver
If --enable-opencv, suggest OpenCV versions [3.0.0 - 3.4.3] (or: OpenCV Wiki)
If --enable-render, need compile OpenSceneGraph library with configure option "-DOSG_WINDOWING_SYSTEM=X11"
If --enable-gles, need to install Mesa3D library
If --enable-vulkan, need to install Mesa3D library
If --enable-dnn, need to compile OpenVino inference-engine