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+.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
+
+.. _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 balanking 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.