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-rw-r--r--ftnoir_filter_accela/ftnoir_filter_accela.cpp4
1 files changed, 3 insertions, 1 deletions
diff --git a/ftnoir_filter_accela/ftnoir_filter_accela.cpp b/ftnoir_filter_accela/ftnoir_filter_accela.cpp
index ab5fda07..81ef3948 100644
--- a/ftnoir_filter_accela/ftnoir_filter_accela.cpp
+++ b/ftnoir_filter_accela/ftnoir_filter_accela.cpp
@@ -88,7 +88,9 @@ void FTNoIR_Filter::filter(const double* input, double *output)
{
Map& m = i >= 3 ? rot : trans;
- smoothed_input[i] = smoothed_input[i] * (1.-alpha) + input[i] * alpha;
+ const bool drop = std::isnan(input[i]) || std::isinf(input[i]);
+ const double f = drop ? last_output[i] : input[i];
+ smoothed_input[i] = smoothed_input[i] * (1.-alpha) + f * alpha;
const double in = smoothed_input[i];