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vo_opengl: add parameter to gaussian filter

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Add a new parameter 'p' to gaussian filter. The new formula used
 a different base taken from fmtconv plugin, so that the
 new parameter is exactly same as the one used in Avisynth and
 Vapoursynth.

 The new default value is 2 / log(2) * 10, with the default value it
 conforms to the original kernel taken from vector-agg.
This commit is contained in:
Bin Jin
2014-08-26 22:19:32 +02:00
committed by wm4
parent b3e788d3f4
commit 08b5dccd12
2 changed files with 16 additions and 3 deletions
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DOCS/man/vo.rst
+9 -1
View File
@@ -319,6 +319,14 @@ Available video output drivers are:
Mitchell-Netravali. The ``b`` and ``c`` parameters can be set with
``lparam1`` and ``lparam2``. Both are set to 1/3 by default.
``gaussian``
Gaussian filter with a parameter ``p`` for sharpness control.
``p`` can be set to float number between 1(blurry) and 100(sharp)
and has a default value of about 28.8 (see ``lparam1``).
Note that for extremely small value of ``p``, a large filter radius
might be required to avoid unintended artifacts (see ``lradius``).
There are some more filters. For a complete list, pass ``help`` as
value, e.g.::
@@ -336,7 +344,7 @@ Available video output drivers are:
Set radius for filters listed below, must be a float number between 1.0
and 8.0. Defaults to be 2.0 if not specified.
``sinc``, ``lanczos``, ``blackman``
``sinc``, ``lanczos``, ``blackman``, ``gaussian``
Note that depending on filter implementation details and video scaling
ratio, the radius that actually being used might be different
video/out/filter_kernels.c
+7 -2
View File
@@ -244,7 +244,12 @@ static double spline64(kernel *k, double x)
static double gaussian(kernel *k, double x)
{
return exp(-2.0 * x * x) * sqrt(2.0 / M_PI);
double p = k->params[0];
if (p > 100.0)
p = 100.0;
if (p < 1.0)
p = 1.0;
return pow(2.0, -(p / 10.0) * x * x);
}
static double sinc(kernel *k, double x)
@@ -292,7 +297,7 @@ const struct filter_kernel mp_filter_kernels[] = {
{"spline16", 2, spline16},
{"spline36", 3, spline36},
{"spline64", 4, spline64},
{"gaussian", 2, gaussian},
{"gaussian", -1, gaussian, .params = {28.85390081777927, NAN} },
{"sinc2", 2, sinc},
{"sinc3", 3, sinc},
{"sinc4", 4, sinc},