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ext-ctrls-image-process.rst

ext-ctrls-image-process.rst 2.1 KB
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  1. .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
    2. 

  2. .. c:namespace:: V4L
    3. 

  3. 

  4. .. _image-process-controls:
    5. 

  5. 

  6. *******************************
    7. 

  7. Image Process Control Reference
    8. 

  8. *******************************
    9. 

  9. 

  10. The Image Process control class is intended for low-level control of
    11. 

  11. image processing functions. Unlike ``V4L2_CID_IMAGE_SOURCE_CLASS``, the
    12. 

  12. controls in this class affect processing the image, and do not control
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  13. capturing of it.
    14. 

  14. 

  15. 

  16. .. _image-process-control-id:
    17. 

  17. 

  18. Image Process Control IDs
    19. 

  19. =========================
    20. 

  20. 

  21. ``V4L2_CID_IMAGE_PROC_CLASS (class)``
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  22.     The IMAGE_PROC class descriptor.
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  23. 

  24. .. _v4l2-cid-link-freq:
    25. 

  25. 

  26. ``V4L2_CID_LINK_FREQ (integer menu)``
    27. 

  27.     The frequency of the data bus (e.g. parallel or CSI-2).
    28. 

  28. 

  29. .. _v4l2-cid-pixel-rate:
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  30. 

  31. ``V4L2_CID_PIXEL_RATE (64-bit integer)``
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  32.     Pixel sampling rate in the device's pixel array. This control is
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  33.     read-only and its unit is pixels / second.
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  34. 

  35.     Some devices use horizontal and vertical blanking to configure the frame
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  36.     rate. The frame rate can be calculated from the pixel rate, analogue crop
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  37.     rectangle as well as horizontal and vertical blanking. The pixel rate
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  38.     control may be present in a different sub-device than the blanking controls
    39. 

  39.     and the analogue crop rectangle configuration.
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  40. 

  41.     The configuration of the frame rate is performed by selecting the desired
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  42.     horizontal and vertical blanking. The unit of this control is Hz.
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  43. 

  44. ``V4L2_CID_TEST_PATTERN (menu)``
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  45.     Some capture/display/sensor devices have the capability to generate
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  46.     test pattern images. These hardware specific test patterns can be
    47. 

  47.     used to test if a device is working properly.
    48. 

  48. 

  49. ``V4L2_CID_DEINTERLACING_MODE (menu)``
    50. 

  50.     The video deinterlacing mode (such as Bob, Weave, ...). The menu items are
    51. 

  51.     driver specific and are documented in :ref:`uapi-v4l-drivers`.
    52. 

  52. 

  53. ``V4L2_CID_DIGITAL_GAIN (integer)``
    54. 

  54.     Digital gain is the value by which all colour components
    55. 

  55.     are multiplied by. Typically the digital gain applied is the
    56. 

  56.     control value divided by e.g. 0x100, meaning that to get no
    57. 

  57.     digital gain the control value needs to be 0x100. The no-gain
    58. 

  58.     configuration is also typically the default.
    59.