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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 <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Hans Verkuil 2006-12-18 13:37:50 -03:00 committed by Mauro Carvalho Chehab
parent b331def2d3
commit 12b896e436
1 changed files with 6 additions and 9 deletions
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15
drivers/media/video/cx2341x.c
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@ -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) {