A useful link (phil's again) http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/Canon.html#AFInfo2
Also has description of the camera specific bits. If the prevailing attitude is to let the canon marketing geniuses stew in their own juices then I can certainly appreciate that. Jason On Wed, Jan 4, 2012 at 12:17 AM, Olivier Tilloy <[email protected]> wrote: > On 2011-12-31, Jason Bishop <[email protected]> wrote: > > Hello all, just joined (thanks Olivier) and wanted to share a little bit > > of code with you in case you thought it useful. I got a canon 7d little > > while ago and noticed that the builtin screen indicates with red boxes > > which focus points were used. I thought that was interesting so I went > > trudging through the exif info to see if I could generate images showing > > the focus points as well. this is what i ended up with. grey boxes > > showing all focus points. white for subset which were active when the > > shot was composed, and red for the ones that were used to take the shot. > > please excuse the code duplication, i haven't cleaned up the code yet > > to deal with dcraw rotating the image for me. You can just ignore the > > clauses for rotatepic==true. > > Very interesting, thanks for sharing Jason! > > Could you maybe post somewhere an original picture that embeds such > information? I’m curious to see the visual result, but I don’t own a > Canon camera. > > Also, do you know whether those magic values you use to extract the data > are standard across all Canon cameras, or if they vary from one model to > the other? Did you base your work on some sort of specification, or did > you have to reverse-engineer the data? > > > I was thinking that perhaps these values (focuspointwidth, > > focuspointheight, focuspointxpos, focuspointypos, activeafpoints, > > afpoints) could be exposed more directly. interested in your thoughts. > > It would make sense, especially if the format is common across all Canon > cameras. I’m thinking that it may be a good candidate for an API such as > the one requested in http://pad.lv/724185 > > Cheers, > > Olivier >
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