heya,
thanks for testing, your squared intensity looks better indeed.
maybe the noise in that image would need an additional threshold on
sharpness, depending on iso/noise sigma from our noise profiles. fwiw i
didn't see any problem with my camera up to iso 6400. maybe it's because
your input is a processed image?
-jo
On Mon, Nov 4, 2013 at 11:22 PM, S. Witt <f...@meterprosekun.de> wrote:
> Hi
>
> the new focus detection is a really interesting feature. From my point
> of view, judging sharpness quickly in lighttable, is (or now was? ;-) )
> a weak point in darktable.
>
> I tried this feature with some images. Especially for some (noisier)
> concert pictures, I noticed that often areas are detected to be in
> focus, which obviously aren't. Here is an example:
> http://www.meterprosekun.de/dtfocusscreens/focus1.jpg
> I wonder, if the noise has been detected here?
> (the full res imsge can be found here:
> http://www.meterprosekun.de/dtfocusscreens/DSC_6666.jpg)
>
> Apart from the above, I would like to suggest a little change. I had a
> quick look into the code. If I am not mistaken, the intensity of the red
> (or blue) frames around clusters scales with the degree of sharpness. In
> order to emphasize the sharpest clusters I changed the red/blue
> intensity to the square of the "sharpness intensity" in function
> dt_focus_draw_clusters. Then it looks like this for the aforementioned
> image: http://www.meterprosekun.de/dtfocusscreens/focus2sqr.jpg
>
> Thanks
> Sören
>
>
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