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facedetect

facedetect

Properties

gboolean display Read / Write
gchar * eyes-profile Read / Write
GstOpencvFaceDetectFlags flags Read / Write
gint min-neighbors Read / Write
gint min-size-height Read / Write
gint min-size-width Read / Write
gchar * mouth-profile Read / Write
gchar * nose-profile Read / Write
gchar * profile Read / Write
gdouble scale-factor Read / Write
GstFaceDetectUpdates updates Read / Write
gint min-stddev Read / Write

Types and Values

Object Hierarchy

    GObject
    ╰── GInitiallyUnowned
        ╰── GstObject
            ╰── GstElement
                ╰── GstBaseTransform
                    ╰── GstVideoFilter
                        ╰── GstOpencvVideoFilter
                            ╰── GstFaceDetect

Description

Performs face detection on videos and images. If you have high cpu load you need to use videoscale with capsfilter and reduce the video resolution.

The image is scaled down multiple times using the GstFaceDetect::scale-factor until the size is <= GstFaceDetect::min-size-width or GstFaceDetect::min-size-height.

Example launch line

1
gst-launch-1.0 autovideosrc ! decodebin ! colorspace ! facedetect ! videoconvert ! xvimagesink
Detect and show faces
1
gst-launch-1.0 autovideosrc ! video/x-raw,width=320,height=240 ! videoconvert ! facedetect min-size-width=60 min-size-height=60 ! colorspace ! xvimagesink
Detect large faces on a smaller image

Synopsis

Element Information

plugin

opencv

author

Michael Sheldon <mike@mikeasoft.com>

class

Filter/Effect/Video

Element Pads

name

sink

direction

sink

presence

always

details

video/x-raw, format=(string)RGB, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]

name

src

direction

source

presence

always

details

video/x-raw, format=(string)RGB, width=(int)[ 1, 2147483647 ], height=(int)[ 1, 2147483647 ], framerate=(fraction)[ 0/1, 2147483647/1 ]

Functions

Types and Values

struct GstFaceDetect

struct GstFaceDetect;

enum GstFaceDetectUpdates

Bus messages update scheme

Members

GST_FACEDETECT_UPDATES_EVERY_FRAME

Send bus update messages for every frame

 

GST_FACEDETECT_UPDATES_ON_CHANGE

Send bus update messages on change (face detected/not detected)

 

GST_FACEDETECT_UPDATES_ON_FACE

Send bus update messages when a face is detected

 

GST_FACEDETECT_UPDATES_NONE

No bus update messages

 

Property Details

The “display” property

  “display”                  gboolean

Sets whether the detected faces should be highlighted in the output.

Flags: Read / Write

Default value: TRUE


The “eyes-profile” property

  “eyes-profile”             gchar *

Location of Haar cascade file to use for eye-pair detection.

Flags: Read / Write

Default value: "/usr/share/OpenCV/haarcascades/haarcascade_mcs_eyepair_small.xml"


The “flags” property

  “flags”                    GstOpencvFaceDetectFlags

Flags to cvHaarDetectObjects.

Flags: Read / Write

Default value: Do Canny edge detection to discard some regions


The “min-neighbors” property

  “min-neighbors”            gint

Minimum number (minus 1) of neighbor rectangles that makes up an object.

Flags: Read / Write

Allowed values: >= 0

Default value: 3


The “min-size-height” property

  “min-size-height”          gint

Minimum area height to be recognized as a face.

Flags: Read / Write

Allowed values: >= 0

Default value: 30


The “min-size-width” property

  “min-size-width”           gint

Minimum area width to be recognized as a face.

Flags: Read / Write

Allowed values: >= 0

Default value: 30


The “mouth-profile” property

  “mouth-profile”            gchar *

Location of Haar cascade file to use for mouth detection.

Flags: Read / Write

Default value: "/usr/share/OpenCV/haarcascades/haarcascade_mcs_mouth.xml"


The “nose-profile” property

  “nose-profile”             gchar *

Location of Haar cascade file to use for nose detection.

Flags: Read / Write

Default value: "/usr/share/OpenCV/haarcascades/haarcascade_mcs_nose.xml"


The “profile” property

  “profile”                  gchar *

Location of Haar cascade file to use for face detection.

Flags: Read / Write

Default value: "/usr/share/OpenCV/haarcascades/haarcascade_frontalface_default.xml"


The “scale-factor” property

  “scale-factor”             gdouble

Factor by which the frame is scaled after each object scan.

Flags: Read / Write

Allowed values: [1.1,10]

Default value: 1.25


The “updates” property

  “updates”                  GstFaceDetectUpdates

When send update bus messages, if at all.

Flags: Read / Write

Default value: Send update messages on every frame


The “min-stddev” property

  “min-stddev”               gint

Minimum image average standard deviation: on images with standard deviation lesser than this value facedetection will not be performed. Setting this property help to save cpu and reduce false positives not performing face detection on images with little changes.

Flags: Read / Write

Allowed values: [0,255]

Default value: 0

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