[FFmpeg-cvslog] avfilter/avf_showcwt: make kernels symmetrical

[Paul B Mahol]

ffmpeg | branch: master | Paul B Mahol <onemda at gmail.com> | Sat Jul 29 11:21:28 2023 +0200| [44813d66e2c7106a36e8b4537d5b50e54d679fb4] | committer: Paul B Mahol

avfilter/avf_showcwt: make kernels symmetrical

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=44813d66e2c7106a36e8b4537d5b50e54d679fb4
---

 libavfilter/avf_showcwt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavfilter/avf_showcwt.c b/libavfilter/avf_showcwt.c
index 85cb19103b..96b8841380 100644
--- a/libavfilter/avf_showcwt.c
+++ b/libavfilter/avf_showcwt.c
@@ -655,7 +655,7 @@ static int compute_kernel(AVFilterContext *ctx)
 
         memset(tkernel, 0, size * sizeof(*tkernel));
         for (int n = 0; n < size; n++) {
-            float ff, f = n-frequency;
+            float ff, f = n+0.5f-frequency;
 
             f = hsize - fabsf(f - hsize);
             ff = expf(-f*f*deviation);