1.21. Detect Control Reference¶
The Detect class includes controls for common features of various motion or object detection capable devices.
1.21.1. Detect Control IDs¶
The Detect class descriptor. Calling ioctls VIDIOC_QUERYCTRL, VIDIOC_QUERY_EXT_CTRL and VIDIOC_QUERYMENU for this control will return a description of this control class.
Sets the motion detection mode.
Disable motion detection.
Use a single motion detection threshold.
The image is divided into a grid, each cell with its own motion
detection threshold. These thresholds are set through the
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
Sets the global motion detection threshold to be used with the
V4L2_DETECT_MD_MODE_GLOBALmotion 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_GRIDmotion 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_GRIDmotion detection mode. Matrix element (0, 0) represents the cell at the top-left of the grid.