vf_edgedetect.c File Reference

Edge detection filter. More...

#include "libavutil/avassert.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"

Classes
struct	plane_info
struct	EdgeDetectContext

Macros
#define	OFFSET(x)   offsetof(EdgeDetectContext, x)
#define	FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
#define	COPY_MAXIMA(ay, ax, by, bx)

Typedefs
typedef struct EdgeDetectContext	EdgeDetectContext

Enumerations
enum	FilterMode {   FILTER_8TAP_SMOOTH, FILTER_8TAP_REGULAR, FILTER_8TAP_SHARP, FILTER_BILINEAR,   N_FILTERS, FILTER_SWITCHABLE = N_FILTERS, MODE_WIRES, MODE_COLORMIX,   NB_MODE, MODE_NONE, MODE_INTERLEAVE, MODE_DEINTERLEAVE,   FILTER_NONE = -1, FILTER_TOUT, FILTER_VREP, FILTER_BRNG,   FILT_NUMB }
enum	{ DIRECTION_45UP, DIRECTION_45DOWN, DIRECTION_HORIZONTAL, DIRECTION_VERTICAL }

Functions
	AVFILTER_DEFINE_CLASS (edgedetect)

Variables
AVFilter	ff_vf_edgedetect

Detailed Description

Edge detection filter.

See also

https://en.wikipedia.org/wiki/Canny_edge_detector

Macro Definition Documentation

COPY_MAXIMA

#define COPY_MAXIMA	(		ay,
			ax,
			by,
			bx
	)

Value:

do {                \
    if (src[i] > src[(ay)*src_linesize + i+(ax)] &&     \
        src[i] > src[(by)*src_linesize + i+(bx)])       \
        dst[i] = av_clip_uint8(src[i]);                 \
} while (0)

Variable Documentation

ff_vf_edgedetect

AVFilter ff_vf_edgedetect

Initial value:

= {
    .name          = "edgedetect",
    .description   = NULL_IF_CONFIG_SMALL("Detect and draw edge."),
    .priv_size     = sizeof(EdgeDetectContext),
    .init          = init,
    .uninit        = uninit,
    .query_formats = query_formats,
    .inputs        = edgedetect_inputs,
    .outputs       = edgedetect_outputs,
    .priv_class    = &edgedetect_class,
    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
}