.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later .. c:namespace:: V4L

.. _detect-controls:

Detect Control Reference

The Detect class includes controls for common features of various motion or object detection capable devices.

.. _detect-control-id:

Detect Control IDs

V4L2_CID_DETECT_CLASS (class) The Detect class descriptor. Calling :ref:VIDIOC_QUERYCTRL for this control will return a description of this control class.

V4L2_CID_DETECT_MD_MODE (menu) Sets the motion detection mode.

.. tabularcolumns:: |p{7.7cm}|p{9.8cm}|

.. flat-table:: :header-rows: 0 :stub-columns: 0

* - ``V4L2_DETECT_MD_MODE_DISABLED``
  - Disable motion detection.
* - ``V4L2_DETECT_MD_MODE_GLOBAL``
  - Use a single motion detection threshold.
* - ``V4L2_DETECT_MD_MODE_THRESHOLD_GRID``
  - The image is divided into a grid, each cell with its own motion
detection threshold. These thresholds are set through the
``V4L2_CID_DETECT_MD_THRESHOLD_GRID`` matrix control.
* - ``V4L2_DETECT_MD_MODE_REGION_GRID``
  - The image is divided into a grid, each cell with its own region
value that specifies which per-region motion detection thresholds
should be used. Each region has its own thresholds. How these
per-region thresholds are set up is driver-specific. The region
values for the grid are set through the
``V4L2_CID_DETECT_MD_REGION_GRID`` matrix control.

V4L2_CID_DETECT_MD_GLOBAL_THRESHOLD (integer) Sets the global motion detection threshold to be used with the V4L2_DETECT_MD_MODE_GLOBAL motion detection mode.

V4L2_CID_DETECT_MD_THRESHOLD_GRID (__u16 matrix) Sets the motion detection thresholds for each cell in the grid. To be used with the V4L2_DETECT_MD_MODE_THRESHOLD_GRID motion detection mode. Matrix element (0, 0) represents the cell at the top-left of the grid.

V4L2_CID_DETECT_MD_REGION_GRID (__u8 matrix) Sets the motion detection region value for each cell in the grid. To be used with the V4L2_DETECT_MD_MODE_REGION_GRID motion detection mode. Matrix element (0, 0) represents the cell at the top-left of the grid.