libavfilter: Add derain filter

Multimedia / FFmpeg - Xuewei Meng [gmail.com] - 6 June 2019 05:59 EDT

Remove the rain in the input image/video by applying the derain methods based on convolutional neural networks. Training scripts as well as scripts for model generation are provided in the repository at https://github.com/XueweiMeng/derain_filter.git.

78e1d7f421 libavfilter: Add derain filter
doc/filters.texi | 34 ++++++++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_derain.c | 212 +++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 248 insertions(+)

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