[Digikam-devel] [digikam] [Bug 279544] Tag image for unsharp pictures

Axel Krebs axel.krebs at t-online.de
Sun Mar 31 10:16:58 BST 2013


--- Comment #3 from Axel Krebs <axel.krebs at t-online.de> ---
Dear Gowtham:

Wonderful to read, that you are working on this issue!

Unfortunately, I am not a programmer or software-specialist.

So, I will try to describe my primary intentions with reflection to some
approaches available.

In modern DLRs they use several ways to get to sharpness- you may want
to check http://en.wikipedia.org/wiki/Autofocus .

If this would resonable to copy one of these methods: I do not know.
Maybe the preconditions are different: in reality, when taking a
picture, we have a reduction from 3D to 2d. When searching unsharp
pictures within a collection, we have "pure 2D".

As a matter of fact, when I suggestet this issue, I had in my mind:
checking large picture collection automatically for _completely_ unsharp
pic to have some type of automated filter-function.

So, my intention was originally, to have some sorting-function. This
would be a much weaker demand than we have in autofocus in modern DLRs.
Isn't it?

Ok, when "sorting out", there should be a remaining lot of pics which do
_not_ fulfil this sharpness criterium. These pics has to be marked out
to check these manually.

As an artists intentions maybe changing and lead by art, not
mathematical rules.

For my opinion, the original pic has the highest value.



Am 31.03.2013 01:01, schrieb Gowtham Ashok:
> https://bugs.kde.org/show_bug.cgi?id=279544
> --- Comment #2 from Gowtham Ashok <gwty93 at gmail.com> ---
> Created attachment 78517
>   --> https://bugs.kde.org/attachment.cgi?id=78517&action=edit
> Algorithm: Finding blurry images
> Basic algorithm which returns a low value when image is blurry and vice versa.
> Requires openCV. Needs one image input.
> To build it, cmake . and make it.
> Please give feedback.

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