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gst/videosignal/gstvideodetect.*: Add property to adjust the center, sensitivity is now the distance from this center.

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Original commit message from CVS:
* gst/videosignal/gstvideodetect.c: (gst_video_detect_420),
(gst_video_detect_set_property), (gst_video_detect_get_property):
* gst/videosignal/gstvideodetect.h:
Add property to adjust the center, sensitivity is now the distance from
this center.
This commit is contained in:
Wim Taymans 2007-06-28 09:36:20 +00:00
parent d66b7e9f26
commit 0c5153fbc9
3 changed files with 28 additions and 7 deletions
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8
ChangeLog
View file

@ -1,3 +1,11 @@
2007-06-28 Wim Taymans <wim@fluendo.com>
* gst/videosignal/gstvideodetect.c: (gst_video_detect_420),
(gst_video_detect_set_property), (gst_video_detect_get_property):
* gst/videosignal/gstvideodetect.h:
Add property to adjust the center, sensitivity is now the distance from
this center.
2007-06-27 Wim Taymans <wim@fluendo.com>
* gst/videosignal/gstvideodetect.c: (gst_video_detect_420),

26
gst/videosignal/gstvideodetect.c
View file

@ -120,7 +120,8 @@
#define DEFAULT_PATTERN_HEIGHT 16
#define DEFAULT_PATTERN_COUNT 4
#define DEFAULT_PATTERN_DATA_COUNT 5
#define DEFAULT_PATTERN_SENSITIVITY 0.2
#define DEFAULT_PATTERN_CENTER 0.5
#define DEFAULT_PATTERN_SENSITIVITY 0.3
#define DEFAULT_LEFT_OFFSET 0
#define DEFAULT_BOTTOM_OFFSET 0
@ -132,6 +133,7 @@ enum
PROP_PATTERN_HEIGHT,
PROP_PATTERN_COUNT,
PROP_PATTERN_DATA_COUNT,
PROP_PATTERN_CENTER,
PROP_PATTERN_SENSITIVITY,
PROP_LEFT_OFFSET,
PROP_BOTTOM_OFFSET
@ -273,12 +275,16 @@ gst_video_detect_420 (GstVideoDetect * videodetect, GstBuffer * buffer)
GST_DEBUG_OBJECT (videodetect, "brightness %f", brightness);
if (i & 1) {
/* odd pixels must be white */
if (brightness < (1.0 - videodetect->pattern_sensitivity))
/* odd pixels must be white, all pixels darker than the center +
* sensitivity are considered wrong. */
if (brightness <
(videodetect->pattern_center + videodetect->pattern_sensitivity))
goto no_pattern;
} else {
/* even pixels must be black */
if (brightness > videodetect->pattern_sensitivity)
/* even pixels must be black, pixels lighter than the center - sensitivity
* are considered wrong. */
if (brightness >
(videodetect->pattern_center - videodetect->pattern_sensitivity))
goto no_pattern;
}
}
@ -300,9 +306,9 @@ gst_video_detect_420 (GstVideoDetect * videodetect, GstBuffer * buffer)
/* calc brightness of width * height box */
brightness =
gst_video_detect_calc_brightness (videodetect, d, pw, ph, stride);
/* update pattern */
/* update pattern, we just use the center to decide between black and white. */
pattern_data <<= 1;
if (brightness > 0.5)
if (brightness > videodetect->pattern_center)
pattern_data |= 1;
}
@ -361,6 +367,9 @@ gst_video_detect_set_property (GObject * object, guint prop_id,
case PROP_PATTERN_DATA_COUNT:
videodetect->pattern_data_count = g_value_get_int (value);
break;
case PROP_PATTERN_CENTER:
videodetect->pattern_center = g_value_get_double (value);
break;
case PROP_PATTERN_SENSITIVITY:
videodetect->pattern_sensitivity = g_value_get_double (value);
break;
@ -400,6 +409,9 @@ gst_video_detect_get_property (GObject * object, guint prop_id, GValue * value,
case PROP_PATTERN_DATA_COUNT:
g_value_set_int (value, videodetect->pattern_data_count);
break;
case PROP_PATTERN_CENTER:
g_value_set_double (value, videodetect->pattern_center);
break;
case PROP_PATTERN_SENSITIVITY:
g_value_set_double (value, videodetect->pattern_sensitivity);
break;

1
gst/videosignal/gstvideodetect.h
View file

@ -54,6 +54,7 @@ struct _GstVideoDetect {
gint pattern_height;
gint pattern_count;
gint pattern_data_count;
gdouble pattern_center;
gdouble pattern_sensitivity;
gint left_offset;
gint bottom_offset;