| 2017/07/10: release libxcam version 1.0.0 |
| * 360 video stitching performance and quality improvement. |
| - enable geometry map to improve performance. |
| - quality tuned on different resolutions (1080P and 4K). |
| - support CPU and OpenCL path in feature match. |
| - enable lens shading correction based on fisheye image. |
| |
| * gyroscope-based video stabilization enabling. |
| - enable gyroscope 3-DoF (orientation) assist video stabilization. |
| - orientation (gyro) data should be measured by quaternion as the pose |
| of target frame reference to base frame |
| |
| * CL framework refine. |
| - enable CL argument template instead of member variables in kernel. |
| - CL kernel support async mode. |
| - image handler take over input/output buffer management from image kernel. |
| |
| * prepare libxcam debian package and fix most warnings. |
| |
| 2017/04/01: release libxcam version 0.9.0 |
| * 360 video stitching improvement. |
| - remove sharp boundary in sphere mode by local/global area resize. |
| - tune algorithm parameters to preserve blinking. |
| - integrate 360 stitching pipeline into libxcam module. |
| - gst-xcam-filter supports 360 stitching case. |
| |
| * export C APIs for each OpenCL feature. |
| - support stich/3d-nr/wavelet-nr/defog features by xcam handle. |
| - be designed for FFmpeg xcam video filter usage. |
| |
| 2016/12/30: release libxcam version 0.8.0 |
| * Digital Video Stabilization (DVS) |
| - enable DVS smart analysis plugin. |
| - algorithms used in DVS (feature detect, optical flow, motion model estimation) are based on OpenCV. |
| - implement image warp perspective algorithm in CL kernel. |
| |
| * Image stitching to create panorama photography |
| - implement fisheye calculation which map location to equirectangular. |
| - enable feature detection and match based on OpenCV optical flow algorithm. |
| - enable seam mask to improve the quality of blender. |
| |
| * gstreamer plugin xcamfilter can co-work with xcamsrc |
| |
| 2016/09/30: release libxcam version 0.7.0 |
| * 3D-NR quality and performance improvement. |
| - use image exposure parameters to adjust global denoise strength. |
| - calculate image local variation to adjust local denoise strength. |
| - optimize OCL kernel by shared local memory and sub-group to |
| improve performance. |
| |
| * defog/dehaze quality improvement based on DCP(dark channel prior). |
| - enable dark channel prior to improve hazy image quality. |
| - fix image corruption in recover step. |
| - add lateral-range filter to smooth dark channel and remove |
| halo effect. |
| |
| * enable multi-band blender for image stitching. |
| - based on gaussian and laplacian pyramid and blend images in each |
| band, then reconstruct stitching image from pyramid level. |
| - blender can smooth seams and prevent ghosting. |
| |
| * enable geometry correction. |
| - map 2D image from src to dst image based on coordinate table which |
| is center aligned. |
| - prevent sawtooth edge by OCL sampler. |
| * gst-xcamfilter feature supports. |
| - xcamfilter can co-work with different camera source. |
| |
| 2016/07/29: release libxcam version 0.6.1 |
| * enable 3D noise reduction, performance stay tuned. |
| - suppress image noise in both temporal and spatial domain. |
| - the algorithm applies denoise filter based on pixel-block differences |
| in neighbor blocks and previous frames. |
| - the processed image is much more clean and preserves motion objects |
| edge in low-light conditions. |
| |
| * support gst xcamfilter plugin which is independent from camera source. |
| - xcamfilter plugin can work with gstreamer source plugins, |
| e.g. videotestsrc/filesrc/v4l2src. |
| - xcamfilter features support defog/wireframe/waveletNR/3d-denoise. |
| - sink pad supports format NV12, src pad supports DMA buffer-sharing |
| for performace if links to HW plugin(encoder). |
| - wireframe/scaler/waveletNR moved to post image processor which can |
| co-work with isp processor(as pre-image processor) |
| |
| 2016/06/30: release libxcam version 0.6.0 |
| * enable block-split version of histogram based WDR tone-mapping algorithm. |
| - divide image into several blocks and apply bidirectional log based |
| function on luminance to improve the contrast inside each block. |
| - apply weight function based on distance between target pixel and center |
| pixel of each neighbor block to smooth and eliminate block boundaries. |
| - apply weight function based on pixel intensity deviation between neighbor |
| blocks keep differentiation and weaken boundaries. |
| - image quality is improved and more details in both over-exposured and |
| under-exposured area can be shown clearly on screen. |
| |
| * Bayesian wavelet shrinkage for adaptive noise filtering. |
| - enable adaptive noise filtering based on Bayesian shrinkage estimation |
| - estimate the image’s background noise level by analyzing. |
| wavelet coefficient. |
| - optimize the threshold T which minimizes the Bayesian risk, |
| i.e, the expected value of the mean square error. |
| |
| * Haar wavelet tuning improvement. |
| - fine tuning the threshold statistic data for ultra-low light condition. |
| to prevent edge from over smoothing. |
| |
| * face detection supports. |
| - enable face detection framework and support FD plugins. |
| - enable wire-frame to track faces. |
| |
| * fog removal improvement based on Retinex algorithm. |
| - support multi-scale algorithm to reduce halo effects. |
| - tune parameters to keep brightness and clear edge. |
| - improve saturation based on chroma enhancement. |
| |
| * image processing service framework. |
| - add pipe-manager to support smart-analysis and post image processor. |
| - separate major code into different modules, e.g. xcore/isp/ocl/3a. |
| - support NV12 stream as fake input instead of camera sensor. |
| |
| 2016/03/28: release libxcam version 0.5.0 |
| * enable new WDR tone mapping based on histogram adjustment. |
| - apply bidirectional log based function on luminance to improve |
| image contrast. |
| - transmit wide dynamic range image data to 8-bit color data by |
| novel histogram adjustment algorithm. |
| - details in both over-exposured and under-exposured area clearly |
| show up on screen. |
| * enable wavelet-based algorithm for noise reduction. |
| - decompose image into multiple-scales by wavelet transform with |
| low pass and high pass filters. |
| - perform soft threshold on smaller coefficients(high-pass) |
| to reduce noise. |
| - threshold should be suitably decided by tuned parameters. |
| - reconstruct image from scaled low-pass and high-pass images. |
| - enable Haar-wavelet and Hat-wavelet NR filters. |
| * enable fog removal feature based on retinex algorithm. |
| - base on retinex single-scale algorithm. |
| - scale down image for gaussian blur to improve performance. |
| - scale up blured image and amplify log differences with original |
| image. |
| * improve sharpness in normal light with extreme profile. |
| * support cl post processing with isp mode. |
| * support swap-buffer on nv12 format if only single plane need to |
| process. |
| |
| 2015/12/30: release libxcam version 0.4.0 |
| * improve performance on OCL pipeline. |
| - design new formats and pipeline to save memory IO. |
| - improve bayer noise reduction with bilateral filter. |
| - support edge enhancement into bayer pipe. |
| - make gpu/cpu working together for 3a-statistics calculation. |
| - move tonemapping kernel from RBG to bayer format. |
| * improve WDR-tonemapping algorithm for quality. |
| - utilize an new adaptive local tone mapping algorithm. |
| - provide the mapping between 16-bit wide dynamic range images to |
| 8-bit images to have “nice looking”. |
| - preserve more information on luminance values of the scene |
| especially for high contrast images. |
| * tonemapping parameters calculated to increase the contrast between |
| high light and low light. |
| - tone mapping regularization parameters are calculated according |
| to the distribution of brightness histogram. |
| - the local adaptive parameter are calculated by weighting the |
| neighbor pixels with a Gaussian blur filter. |
| * add bayer raw video input to simulate camera sensor. |
| |
| 2015/10/19: release libxcam version 0.3.0 |
| * improved OCL pipeline on basic and advanced/extreme pipeline |
| - add new bayer noise-reduction into demosaic |
| - merged yuv-tnr into yuv-pipe kernel |
| - merged TNR-yuv and TNR-rgb together |
| * support WDR(wide dynamic range) feature |
| * add 3a analysis tuner framework for more features tunning, e.g TNR |
| * add hybrid 3a analysis framework |
| - support partial customized 3a algorith, e.g AWB/AE |
| * add smart analysis framework |
| - generate small scaled picture |
| - support customized to analyze small picture and feedback results |
| - support loading user-defined method on smart analysis |
| |
| 2015/07/31: release libxcam version 0.2.1 |
| * improved OCL pipeline on basic 3a image processing |
| - merged bayer kernels with blc, wb, gamma, demosaic and 3a stats. |
| - merged yuv kernerls with rgb2yuv color conversion and macc. |
| - support async framework as option on cl features |
| - support OCL buffer allocation which can choose tiling mode. |
| * support different AIQ versions. |
| * fix capture of dead-loop and sensor format setting. |
| |
| 2015/07/02: release libxcam version 0.2.0 |
| * add gstreamer plugin 'xcamsrc' for Linux media framework support |
| * support loading user-defined 3a algorithm lib dynamically |
| * support more manual 3a features on ISP, e.g multiple-ae-window, ae/awb speed... |
| * add OpenCL pipeline for 3a image processing |
| - bayer format features, black level correction, defect pixel |
| correction, whitebalance, 3a statistics calculation, |
| demosaic, gamma correction, HDR(high dynamic range) |
| - RGBA format features, bilateral NR(noise reduction), simple NR, |
| temporal NR, macc, color correction |
| - YUV format features, temporal NR, edge enhancement, color conversion |
| - support any user-defined 3a algorithms(e.g AIQ) |
| * rich test cases, e.g. test-device-manager, test-cl-image |
| |
| 2015/01/15: Initial xcam version 0.1 |
