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avfilter/vf_fftdnoiz: add alternative denoising method

This commit is contained in:
Paul B Mahol 2022-05-05 11:54:02 +02:00
parent 0914e3a14a
commit 003f9a9b41
2 changed files with 20 additions and 1 deletions
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3
doc/filters.texi
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@ -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.

18
libavfilter/vf_fftdnoiz.c
View File

@ -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;
}