GstEdmaPtz
Overview
GstEdmaPtz is a GStreamer element that emulates camera PTZ (Pan, Tilt and Zoom) digitally, using EDMA transfers to scale and move the original frame to a second, smaller frame.
PTZ Camera
PTZ stands for Pan, Tilt and Zoom. A PTZ Camera is a camera that allows remote directional and zoom control. The following image shows a webcam and the directional allowed movements.
EDMA PTZ
The EDMA PTZ element emulates digitally PTZ based on 3 parameters: input resolution, output resolution and the properties (pan, tilt and zoom). The properties are floating point numbers ranging from 0.0 to 1.0 relative to the in/out resolutions. All of the properties (pan, tilt and zoom) may be modified at runtime with minimum lag. The following sections describe each property individually.
Zoom
zoom : Zoom of the camera. 0 indicates the greatest FOV, while 1 indicates contrary.
flags: readable, writable, controllable
Double. Range: 0 - 1 Default: 0,5
The following image explains the effect of changing the zoom property.
Pan & Tilt
pan : Pan of the camera. 0 indicates the leftmost coordinate, while 1 indicates the rightmost.
flags: readable, writable, controllable
Double. Range: 0 - 1 Default: 0,5
tilt : Tilt of the camera. 0 indicates the topmost coordinate, while 1 indicates the bottommost.
flags: readable, writable, controllable
Double. Range: 0 - 1 Default: 0,5
The following image explains the effect of changing the pan and tilt properties.
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