Documentation/userspace-api/media/v4l/ext-ctrls-detect.rst

Source file repositories/reference/linux-study-clean/Documentation/userspace-api/media/v4l/ext-ctrls-detect.rst

File Facts

System
Linux kernel
Corpus path
Documentation/userspace-api/media/v4l/ext-ctrls-detect.rst
Extension
.rst
Size
2248 bytes
Lines
66
Domain
Support Tooling And Documentation
Bucket
Documentation
Inferred role
Support Tooling And Documentation: documentation
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

.. 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.

Annotation

Implementation Notes