Hi, On Thursday 03 March 2011 14:17:10 Kim HeungJun wrote: > 2011. 3. 3., 오후 7:08, Laurent Pinchart 작성: > > On Thursday 03 March 2011 03:16:34 Kim, HeungJun wrote: > >> Document about the type changes and the enumeration of the auto focus > >> control. > >> > >> Signed-off-by: Heungjun Kim <riverful.kim@xxxxxxxxxxx> > >> Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx> > >> --- > >> Documentation/DocBook/v4l/controls.xml | 31 > >> +++++++++++++++++++++++++--- Documentation/DocBook/v4l/videodev2.h.xml | > >> 6 +++++ > >> 2 files changed, 33 insertions(+), 4 deletions(-) > >> > >> diff --git a/Documentation/DocBook/v4l/controls.xml > >> b/Documentation/DocBook/v4l/controls.xml index 2fae3e8..889fa84 100644 > >> --- a/Documentation/DocBook/v4l/controls.xml > >> +++ b/Documentation/DocBook/v4l/controls.xml > >> @@ -1801,12 +1801,35 @@ negative values towards infinity. This is a > >> write-only control.</entry> </row> > >> > >> <row><entry></entry></row> > >> > >> - <row> > >> + <row id="v4l2-focus-auto-type"> > >> > >> <entry > >> > >> spanname="id"><constant>V4L2_CID_FOCUS_AUTO</constant> </entry> - > >> <entry>boolean</entry> > >> + <entry>enum v4l2_focus_auto_type</entry> > >> > >> </row><row><entry spanname="descr">Enables automatic focus > >> > >> -adjustments. The effect of manual focus adjustments while this feature > >> -is enabled is undefined, drivers should ignore such requests.</entry> > >> +adjustments of the normal or macro or continuous(CAF) mode. The effect > >> of +manual focus adjustments while this feature is enabled is > >> undefined, +drivers should ignore such requests. Possible values > >> are:</entry> + </row> > >> + <row> > >> + <entrytbl spanname="descr" cols="2"> > >> + <tbody valign="top"> > >> + <row> > >> + <entry><constant>V4L2_FOCUS_MANUAL</constant> </entry> > >> + <entry>Manual focus mode.</entry> > >> + </row> > >> + <row> > >> + <entry><constant>V4L2_FOCUS_AUTO</constant> </entry> > >> + <entry>Auto focus mode with normal operation.</entry> > >> + </row> > >> + <row> > >> + <entry><constant>V4L2_FOCUS_MACRO</constant> </entry> > >> + <entry>Auto focus mode with macro operation.</entry> > >> + </row> > >> + <row> > >> + <entry><constant>V4L2_FOCUS_CONTINUOUS</constant> </entry> > >> + <entry>Auto focus mode with continuous(CAF) operation.</entry> > > > > I should have asked this sooner, but what's the difference between normal > > AF and continuous AF ? > > Let's assume that the whole focus process(of course the sensor-internal > process automatically) is below : 1) pointing the object focussed > > : mostly this is possible to be a middle spot, or pre-given orient x & > : y set from register. > > (The mode using given orient x & y, may be defined V4L2_FOCUS_TOUCH or > whatever, but I know touch auto focus suggestion is determined nothing so > far, because of that, after this I will suggest to discuss about it one > more.) 2) starting and completing the move of the motor to control lens, > using the focusing internal algorithm 3) check whether the lens position > is proper or not, using the focusing internal algorithm, too. (If the > position is not proper, the image may looks defocused) > > In the Normal AF mode, the sensor do the whole focusing process once, and > after completing to move lens, even though the sensor failed focusing > process. On the other hand, the sensor repeats 1~3 in the Continuous AF > mode periodically, regardless of success of failure. OK, that was my understanding as well. How will that work with the proposed focus menu control ? Don't you need a button control for normal auto-focus ? -- 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
