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| author | Sylwester Nawrocki <s.nawrocki@samsung.com> | 2012-03-06 07:06:55 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2012-05-14 14:03:47 -0300 |
| commit | d58083c949b3d76aba225be9f303ab5dab585064 (patch) | |
| tree | 3181333e4eacbdcc10743aee341ba6bbbd1adf1e /Documentation/DocBook | |
| parent | 515f32879a05bdb69f9b3f86f53db4c04b95e845 (diff) | |
| download | lwn-d58083c949b3d76aba225be9f303ab5dab585064.tar.gz lwn-d58083c949b3d76aba225be9f303ab5dab585064.zip | |
[media] V4L: Add camera exposure bias control
The camera may in some conditions incorrectly determine the exposure,
and a manual automatic exposure correction may be needed. This patch
adds V4L2_CID_AUTO_EXPOSURE_BIAS control which allows to add some
offset in the automatic exposure control loop, to compensate for
frame under- or over-exposure.
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'Documentation/DocBook')
| -rw-r--r-- | Documentation/DocBook/media/v4l/controls.xml | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/Documentation/DocBook/media/v4l/controls.xml b/Documentation/DocBook/media/v4l/controls.xml index e2ff0f98f08d..745b611c3593 100644 --- a/Documentation/DocBook/media/v4l/controls.xml +++ b/Documentation/DocBook/media/v4l/controls.xml @@ -2849,6 +2849,22 @@ remain constant.</entry> <row><entry></entry></row> <row> + <entry spanname="id"><constant>V4L2_CID_EXPOSURE_BIAS</constant> </entry> + <entry>integer menu</entry> + </row><row><entry spanname="descr"> Determines the automatic +exposure compensation, it is effective only when <constant>V4L2_CID_EXPOSURE_AUTO</constant> +control is set to <constant>AUTO</constant>, <constant>SHUTTER_PRIORITY </constant> +or <constant>APERTURE_PRIORITY</constant>. +It is expressed in terms of EV, drivers should interpret the values as 0.001 EV +units, where the value 1000 stands for +1 EV. +<para>Increasing the exposure compensation value is equivalent to decreasing +the exposure value (EV) and will increase the amount of light at the image +sensor. The camera performs the exposure compensation by adjusting absolute +exposure time and/or aperture.</para></entry> + </row> + <row><entry></entry></row> + + <row> <entry spanname="id"><constant>V4L2_CID_PAN_RELATIVE</constant> </entry> <entry>integer</entry> </row><row><entry spanname="descr">This control turns the |