From 12b896e436a3b1bc83856962388ae1ab154742a6 Mon Sep 17 00:00:00 2001 From: Hans Verkuil Date: Mon, 18 Dec 2006 13:37:50 -0300 Subject: [PATCH] V4L/DVB (4983): Force temporal filter to 0 when scaling to prevent ghosting. Change the code to unconditionally turn off the temporal filter when scaling. If the window is not full screen the filter will introduce a nasty ghosting effect. Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/cx2341x.c | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-) diff --git a/drivers/media/video/cx2341x.c b/drivers/media/video/cx2341x.c index 657e0b969145..e796afdf533b 100644 --- a/drivers/media/video/cx2341x.c +++ b/drivers/media/video/cx2341x.c @@ -742,7 +742,6 @@ int cx2341x_update(void *priv, cx2341x_mbox_func func, if (old == NULL || old->width != new->width || old->height != new->height || old->video_encoding != new->video_encoding) { - int is_scaling; u16 w = new->width; u16 h = new->height; @@ -752,20 +751,18 @@ int cx2341x_update(void *priv, cx2341x_mbox_func func, } err = cx2341x_api(priv, func, CX2341X_ENC_SET_FRAME_SIZE, 2, h, w); if (err) return err; + } + if (new->width != 720 || new->height != (new->is_50hz ? 576 : 480)) { /* Adjust temporal filter if necessary. The problem with the temporal filter is that it works well with full resolution capturing, but not when the capture window is scaled (the filter introduces - a ghosting effect). So if the capture window changed, and there is - no updated filter value, then the filter is set depending on whether - the new window is full resolution or not. + a ghosting effect). So if the capture window is scaled, then + force the filter to 0. - For full resolution a setting of 8 really improves the video + For full resolution the filter really improves the video quality, especially if the original video quality is suboptimal. */ - is_scaling = new->width != 720 || new->height != (new->is_50hz ? 576 : 480); - if (old && old->video_temporal_filter == temporal) { - temporal = is_scaling ? 0 : 8; - } + temporal = 0; } if (old == NULL || old->stream_type != new->stream_type) { -- 2.39.2