| 12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758 |
- .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
- .. c:namespace:: V4L
- .. _image-process-controls:
- *******************************
- Image Process Control Reference
- *******************************
- The Image Process control class is intended for low-level control of
- image processing functions. Unlike ``V4L2_CID_IMAGE_SOURCE_CLASS``, the
- controls in this class affect processing the image, and do not control
- capturing of it.
- .. _image-process-control-id:
- Image Process Control IDs
- =========================
- ``V4L2_CID_IMAGE_PROC_CLASS (class)``
- The IMAGE_PROC class descriptor.
- .. _v4l2-cid-link-freq:
- ``V4L2_CID_LINK_FREQ (integer menu)``
- The frequency of the data bus (e.g. parallel or CSI-2).
- .. _v4l2-cid-pixel-rate:
- ``V4L2_CID_PIXEL_RATE (64-bit integer)``
- Pixel sampling rate in the device's pixel array. This control is
- read-only and its unit is pixels / second.
- Some devices use horizontal and vertical blanking to configure the frame
- rate. The frame rate can be calculated from the pixel rate, analogue crop
- rectangle as well as horizontal and vertical blanking. The pixel rate
- control may be present in a different sub-device than the blanking controls
- and the analogue crop rectangle configuration.
- The configuration of the frame rate is performed by selecting the desired
- horizontal and vertical blanking. The unit of this control is Hz.
- ``V4L2_CID_TEST_PATTERN (menu)``
- Some capture/display/sensor devices have the capability to generate
- test pattern images. These hardware specific test patterns can be
- used to test if a device is working properly.
- ``V4L2_CID_DEINTERLACING_MODE (menu)``
- The video deinterlacing mode (such as Bob, Weave, ...). The menu items are
- driver specific and are documented in :ref:`uapi-v4l-drivers`.
- ``V4L2_CID_DIGITAL_GAIN (integer)``
- Digital gain is the value by which all colour components
- are multiplied by. Typically the digital gain applied is the
- control value divided by e.g. 0x100, meaning that to get no
- digital gain the control value needs to be 0x100. The no-gain
- configuration is also typically the default.
|
