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| author | Paul B Mahol <onemda@gmail.com> | 2022-05-05 11:54:02 +0200 |
|---|---|---|
| committer | Paul B Mahol <onemda@gmail.com> | 2022-05-05 19:06:08 +0200 |
| commit | 003f9a9b41d62280ffd107d6e51e20c1745bccd6 (patch) | |
| tree | d12c0dc8ee22233a96359e940a03f0620b094530 | |
| parent | 0914e3a14ae6a8b61af72abd90f9caca5053b9c1 (diff) | |
| download | ffmpeg-003f9a9b41d62280ffd107d6e51e20c1745bccd6.tar.gz | |
avfilter/vf_fftdnoiz: add alternative denoising method
| -rw-r--r-- | doc/filters.texi | 3 | ||||
| -rw-r--r-- | libavfilter/vf_fftdnoiz.c | 18 |
2 files changed, 20 insertions, 1 deletions
diff --git a/doc/filters.texi b/doc/filters.texi index 478a75bd3a..b21bd198ec 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -12347,6 +12347,9 @@ Set size of block in pixels, Default is 32, can be 8 to 256. @item overlap Set block overlap. Default is 0.5. Allowed range is from 0.2 to 0.8. +@item method +Set denoising method. Default is @code{wiener}, can also be @code{hard}. + @item prev Set number of previous frames to use for denoising. By default is set to 0. diff --git a/libavfilter/vf_fftdnoiz.c b/libavfilter/vf_fftdnoiz.c index 6ae194a360..f22b3dbb54 100644 --- a/libavfilter/vf_fftdnoiz.c +++ b/libavfilter/vf_fftdnoiz.c @@ -55,6 +55,7 @@ typedef struct FFTdnoizContext { float amount; int block_size; float overlap; + int method; int nb_prev; int nb_next; int planesf; @@ -85,6 +86,12 @@ static const AVOption fftdnoiz_options[] = { OFFSET(block_size), AV_OPT_TYPE_INT, {.i64=32}, 8, 256, .flags = FLAGS }, { "overlap", "set block overlap", OFFSET(overlap), AV_OPT_TYPE_FLOAT, {.dbl=0.5}, 0.2, 0.8, .flags = FLAGS }, + { "method", "set method of denoising", + OFFSET(method), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, .flags = TFLAGS, "method" }, + { "wiener", "wiener method", + 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, .flags = TFLAGS, "method" }, + { "hard", "hard thresholding", + 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, .flags = TFLAGS, "method" }, { "prev", "set number of previous frames for temporal denoising", OFFSET(nb_prev), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, .flags = FLAGS }, { "next", "set number of next frames for temporal denoising", @@ -495,6 +502,7 @@ static void filter_plane2d(FFTdnoizContext *s, int plane, const int block = p->b; const int nox = p->nox; const int noy = p->noy; + const int method = s->method; const int buffer_linesize = p->buffer_linesize / sizeof(float); const float depthx = (1 << (s->depth - 8)) * (1 << (s->depth - 8)); const float sigma = s->sigma * depthx / (s->block_size * s->block_size); @@ -514,7 +522,15 @@ static void filter_plane2d(FFTdnoizContext *s, int plane, re = buff[j * 2 ]; im = buff[j * 2 + 1]; power = re * re + im * im; - factor = fmaxf(limit, (power - sigma) / (power + 1e-15f)); + switch (method) { + case 0: + factor = fmaxf(limit, (power - sigma) / (power + 1e-15f)); + break; + case 1: + factor = power < sigma ? limit : 1.f; + break; + } + buff[j * 2 ] *= factor; buff[j * 2 + 1] *= factor; } |