NvDsDrawFunc

class savant.deepstream.drawfunc.NvDsDrawFunc(**kwargs)

Default implementation of PyFunc for drawing on frame. Uses OpenCV GpuMat to work with frame data without mapping to CPU through OpenCV-based Artist.

PyFunc implementations are defined in and instantiated by a PyFunc structure.

draw(buffer, frame_meta)

Draw metadata on a frame in a batch.

Parameters:

buffer (Buffer) – Gstreamer buffer.
frame_meta (NvDsFrameMeta) – Frame metadata for a frame in a batch.

override_draw_spec(object_meta, draw_spec)

Override draw specification for an object based on dynamically changing object properties. For example, re-assign bbox color from default per object class one to custom per track id one.

Parameters:

object_meta (ObjectMeta) – Object’s meta
draw_spec (ObjectDraw) – Draw specification

Returns:

Overridden draw specification

Return type:

ObjectDraw

draw_on_frame(frame_meta, artist)

Draws bounding boxes and labels for all objects in the frame’s metadata.

Parameters:

frame_meta (NvDsFrameMeta) – Frame metadata.
artist (ArtistGPUMat) – Artist to draw on the frame.