ffmpeg视频滤镜：均值模糊-boxblur

滤镜简述

boxblur

官网链接=> https://ffmpeg.org/ffmpeg-filters.html#boxblur

这个滤镜会使图片或者视频变得模糊，他可以针对色度和亮度进行模糊。

滤镜的使用

参数

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boxblur AVOptions:
   luma_radius       <string>     ..FV....... Radius of the luma blurring box (default "2")
   lr                <string>     ..FV....... Radius of the luma blurring box (default "2")
   luma_power        <int>        ..FV....... How many times should the boxblur be applied to luma (from 0 to INT_MAX) (default 2)
   lp                <int>        ..FV....... How many times should the boxblur be applied to luma (from 0 to INT_MAX) (default 2)
   chroma_radius     <string>     ..FV....... Radius of the chroma blurring box
   cr                <string>     ..FV....... Radius of the chroma blurring box
   chroma_power      <int>        ..FV....... How many times should the boxblur be applied to chroma (from -1 to INT_MAX) (default -1)
   cp                <int>        ..FV....... How many times should the boxblur be applied to chroma (from -1 to INT_MAX) (default -1)
   alpha_radius      <string>     ..FV....... Radius of the alpha blurring box
   ar                <string>     ..FV....... Radius of the alpha blurring box
   alpha_power       <int>        ..FV....... How many times should the boxblur be applied to alpha (from -1 to INT_MAX) (default -1)
   ap                <int>        ..FV....... How many times should the boxblur be applied to alpha (from -1 to INT_MAX) (default -1)

注意一下，lr和luma_radius是一个参数，lr是luma_radius的缩写，后面的类似。

luma是亮度，亮度的值越大，视觉上会越模糊，这个值最大是min(w,h)/2
chroma是色度，这个值越大，图片的颜色越淡，这个值最大是min(w,h)/2
luma_power和choma_power这个是迭代次数，即反复的再图片上执行均值模糊操作

使用

原图

明度和亮度都最大值的时候

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ffmpeg -y -i ffm_media/gee_short.jpg -filter_complex "boxblur=luma_radius=min(h\,w)/10:luma_power=1:chroma_radius=min(cw\,ch)/10:chroma_power=1" /data/work_space/result/boxblur/boxblur_test_02.jpg

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ffmpeg -y -i ffm_media/gee_short.jpg -filter_complex "boxblur=luma_radius=1:luma_power=1:chroma_radius=min(cw\,ch)/10:chroma_power=1" /data/work_space/result/boxblur/boxblur_test_08.jpg

色度最大值的时候

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ffmpeg -y -i ffm_media/gee_short.jpg -filter_complex "boxblur=luma_radius=min(cw\,ch)/10:luma_power=1:chroma_radius=1:chroma_power=1" /data/work_space/result/boxblur/boxblur_test_09.jpg

亮度最大值的时候

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ffmpeg -y -i ffm_media/gee_short.jpg -filter_complex "boxblur=luma_radius=10:luma_power=5:chroma_radius=1:chroma_power=1" /data/work_space/result/boxblur/boxblur_test_06.jpg

色度和亮度都比较小的时候

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## 祝你好运
 
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