Hi, On Thursday 29 December 2011 06:40:57 HeungJun, Kim wrote: > On Wednesday, December 28, 2011 10:56 PM Laurent Pinchart wrote: > > On Wednesday 28 December 2011 07:23:46 HeungJun, Kim wrote: [snip] > > > diff --git a/Documentation/DocBook/media/v4l/controls.xml > > > b/Documentation/DocBook/media/v4l/controls.xml index 350c138..afe1845 > > > 100644 > > > --- a/Documentation/DocBook/media/v4l/controls.xml > > > +++ b/Documentation/DocBook/media/v4l/controls.xml > > > @@ -2879,6 +2879,94 @@ it one step further. This is a write-only > > > control.</entry> </row> > > > > > > <row><entry></entry></row> > > > > > > + <row id="v4l2-scenemode"> > > > + <entry > > > spanname="id"><constant>V4L2_CID_SCENEMODE</constant> </entry> + > > > <entry>enum v4l2_scenemode</entry> > > > + </row><row><entry spanname="descr">This control sets > > > + the camera's scenemode, and it is provided by the type of > > > + the enum values. The "None" mode means the status > > > + when scenemode algorithm is not activated, like after booting > > > time. > > > + On the other hand, the "Normal" mode means the scenemode algorithm > > > + is activated on the normal mode.</entry> > > > > What low-level parameters do the scene mode control ? How does it > > interact with the related controls ? > > For using this control, in M-5MOLS sensor case, several register is > configured, like Exposure(locking/Indexed preset/mode), Focus(locking), > WhiteBalance, etc. And I think the process interacting and syncing the > register's value should be up to the each drivers, and the m5mols driver > will be. Does it mean that the scene mode is handled by the driver, which then configures exposure, focus, white balance, ... ? > Anyways, could you explain the difference with low- and high- in more > details? > > :) > > I still did not understand well. The concepts are a bit ill-defined currently. We have low-level sensor controls such as exposure time, gains, ... The controls you propose offer a higher level interface, likely using software-based algorithms running on the sensor instead of just applying hardware parameters. > > > + </row> > > > + <row> > > > + <entrytbl spanname="descr" cols="2"> > > > + <tbody valign="top"> > > > + <row> > > > + <entry><constant>V4L2_SCENEMODE_NONE</constant> </entry> > > > + <entry>Scenemode None.</entry> > > > + </row> > > > + <row> > > > + > > <entry><constant>V4L2_SCENEMODE_NORMAL</constant> </entry> > > > > + <entry>Scenemode Normal.</entry> > > > + </row> > > > + <row> > > > + > > > > <entry><constant>V4L2_SCENEMODE_PORTRAIT</constant> </entry> > > > > > + <entry>Scenemode Portrait.</entry> > > > > Could you please describe the scene modes in more details ? > > Yes, the photographer should adjust the exposure(luminance), focus, iso, > etc, for getting better image according to each specific circumstances. > But, it's uncomfortable to set all controls at every time. > The scene mode can make this at one time. It is just not only setting once. > According to fixed scene circumstance, the internal algorithm is also > needed for it. > > This function is usually provided as just preset, but, it's not just > preset, because the specific algorithm is existed for "scene mode", > except the collection of the camera control preset. > > The enumeration I suggest, can cover almost scene mode. Of course, the term > is fixed. The M-5MOLS can use all the scene mode. > Please, see drivers/media/video/m5mols/m5mols_contro.c. What I meant when asking you to explain the scene modes in more details was to improve the documentation by adding a detailed description of each scene mode. -- Regards, Laurent Pinchart -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
