qtioverlay

The QTI's qtioverlay GStreamer element has the capability of drawing and blitting RGB or YUV contents to YUV frames. it is in-place GStreamer element and supports only one source and sink pad. It supports bliting - static image, bounding boxes, custom user text and date/time overlays ontop of YUV frames, these YUV frames can be from Camera or from Video decode element. this element can be configured by machine learning metadata (MLMeta) and/or GST properties. The supported MLMeta types are detection, segmentation, classification, and posenet. One metadata entry corresponds to one overlay item. Multiple items of the same or/and different types are supported simultaneously. The detection type is drawn as a bounding box with a label. There is no limitation for the number of detection metadata entries/bounding boxes. However, increasing the number of bounding boxes can impact performance. The supported overlay image format is RGBA, the input overlay image does not need to match stream dimensions, it is upscaled to output stream dimensions automatically. The classification type is presented as a text overlay. The date/time and user text overlay can only be enabled by GST properties, the date/time is generated automatically by plugin using system APIs. and usertext should be provided by the user via GST property.

Pad templates

sink (input)

Presence – always

Direction – sink

source (output)

Presence – always

Direction – src

Properties

name

The name of the object.

qos

Handle Quality-of-Service events.

overlay-text

User text overlay. If this property is set user text is enabled and user text value from property is displayed.

overlay-date

Bounding box overlay color. Color format is RGBA.

bbox-color

Bounding box overlay color. Color format is RGBA.

date-color

Date overlay color. Color format is RGBA.

text-color

Text overlay color. Color format is RGBA

pose-color

Pose overlay color. Color format is RGBA.