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avfilter/vf_amplify: add tolerance option

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This commit is contained in:
Paul B Mahol 2019-02-22 23:32:27 +01:00
parent 6f93868e46
commit c679119a73
2 changed files with 10 additions and 2 deletions
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5
doc/filters.texi
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@ -5652,6 +5652,11 @@ Set threshold for difference amplification. Any difference greater or equal to
this value will not alter source pixel. Default is 10.
Allowed range is from 0 to 65535.
@item tolerance
Set tolerance for difference amplification. Any difference lower to
this value will not alter source pixel. Default is 0.
Allowed range is from 0 to 65535.
@item low
Set lower limit for changing source pixel. Default is 65535. Allowed range is from 0 to 65535.
This option controls maximum possible value that will decrease source pixel value.

7
libavfilter/vf_amplify.c
View File

@ -34,6 +34,7 @@ typedef struct AmplifyContext {
int radius;
float factor;
float threshold;
float tolerance;
int planes;
int llimit;
@ -104,6 +105,7 @@ static int amplify_frame(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs
const int radius = s->radius;
const int nb_inputs = s->nb_inputs;
const float threshold = s->threshold;
const float tolerance = s->tolerance;
const float factor = s->factor;
const int llimit = s->llimit;
const int hlimit = s->hlimit;
@ -136,7 +138,7 @@ static int amplify_frame(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs
avg = sum / (float)nb_inputs;
diff = src - avg;
if (fabsf(diff) < threshold) {
if (fabsf(diff) < threshold && fabsf(diff) > tolerance) {
int amp;
if (diff < 0) {
amp = -FFMIN(FFABS(diff * factor), llimit);
@ -179,7 +181,7 @@ static int amplify_frame(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs
avg = sum / (float)nb_inputs;
diff = src - avg;
if (fabsf(diff) < threshold) {
if (fabsf(diff) < threshold && fabsf(diff) > tolerance) {
int amp;
if (diff < 0) {
amp = -FFMIN(FFABS(diff * factor), llimit);
@ -271,6 +273,7 @@ static const AVOption amplify_options[] = {
{ "radius", "set radius", OFFSET(radius), AV_OPT_TYPE_INT, {.i64=2}, 1, 63, .flags = FLAGS },
{ "factor", "set factor", OFFSET(factor), AV_OPT_TYPE_FLOAT, {.dbl=2}, 0, UINT16_MAX, .flags = FLAGS },
{ "threshold", "set threshold", OFFSET(threshold), AV_OPT_TYPE_FLOAT, {.dbl=10}, 0, UINT16_MAX, .flags = FLAGS },
{ "tolerance", "set tolerance", OFFSET(tolerance), AV_OPT_TYPE_FLOAT, {.dbl=0}, 0, UINT16_MAX, .flags = FLAGS },
{ "low", "set low limit for amplification", OFFSET(llimit), AV_OPT_TYPE_INT, {.i64=UINT16_MAX}, 0, UINT16_MAX, .flags = FLAGS },
{ "high", "set high limit for amplification", OFFSET(hlimit), AV_OPT_TYPE_INT, {.i64=UINT16_MAX}, 0, UINT16_MAX, .flags = FLAGS },
{ "planes", "set what planes to filter", OFFSET(planes), AV_OPT_TYPE_FLAGS, {.i64=7}, 0, 15, FLAGS },