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avfilter/vf_derain.c: put all the calculation in model file.

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currently, the model outputs the rain, and so need a subtraction
in filter c code to get the final derain result.

I've sent a PR to update the model file and accepted, see at
https://github.com/XueweiMeng/derain_filter/pull/3

Signed-off-by: Guo, Yejun <yejun.guo@intel.com>
Signed-off-by: Steven Liu <lq@chinaffmpeg.org>
This commit is contained in:
Guo, Yejun 2020-03-20 20:54:07 +08:00
parent bbc64799dc
commit 7e4527e8fa
2 changed files with 6 additions and 7 deletions
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7
doc/filters.texi
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@ -8878,6 +8878,7 @@ delogo=x=0:y=0:w=100:h=77:band=10
@end itemize
@anchor{derain}
@section derain
Remove the rain in the input image/video by applying the derain methods based on
@ -8932,6 +8933,8 @@ Note that different backends use different file formats. TensorFlow and native
backend can load files for only its format.
@end table
It can also be finished with @ref{dnn_processing} filter.
@section deshake
Attempt to fix small changes in horizontal and/or vertical shift. This
@ -9201,9 +9204,9 @@ Set the output name of the dnn network.
@itemize
@item
Halve the red channle of the frame with format rgb24:
Remove rain in rgb24 frame with can.pb (see @ref{derain} filter):
@example
ffmpeg -i input.jpg -vf format=rgb24,dnn_processing=model=halve_first_channel.model:input=dnn_in:output=dnn_out:dnn_backend=native out.native.png
./ffmpeg -i rain.jpg -vf format=rgb24,dnn_processing=dnn_backend=tensorflow:model=can.pb:input=x:output=y derain.jpg
@end example
@item

6
libavfilter/vf_derain.c
View File

@ -100,7 +100,6 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
AVFilterLink *outlink = ctx->outputs[0];
DRContext *dr_context = ctx->priv;
DNNReturnType dnn_result;
int pad_size;
AVFrame *out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out) {
@ -129,15 +128,12 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
out->width = dr_context->output.width;
outlink->h = dr_context->output.height;
outlink->w = dr_context->output.width;
pad_size = (in->height - out->height) >> 1;
for (int i = 0; i < out->height; i++){
for(int j = 0; j < out->width * 3; j++){
int k = i * out->linesize[0] + j;
int t = i * out->width * 3 + j;
int t_in = (i + pad_size) * in->width * 3 + j + pad_size * 3;
out->data[0][k] = CLIP((int)((((float *)dr_context->input.data)[t_in] - ((float *)dr_context->output.data)[t]) * 255), 0, 255);
out->data[0][k] = CLIP((int)((((float *)dr_context->output.data)[t]) * 255), 0, 255);
}
}