On 5/31/2010 4:42 PM, JimAtQuarktet wrote:
> On May 28, 11:52 pm, "Nitram"
n_o_s_p_a_m.gmail.com>
> wrote:>> Hi,
>>
>> My question might be simplistic as neither optics nor image processing is
>> my field.
>>
>> Firstly, I was wondering if it is possible to compensate for a picture
>> taken by an out-of-focus digital camera by doing a 2D deconvolution on it
>> (MMSE filtering or something like that), in order to recover the in-focus
>> picture
>>
>> Secondly, can the optical transfer function between a properly focused
>> picture and an out of focus picture be parameterized in such a way that a
>> user could recover the image by gradually varying that parameter until the
>> image is in focus? If this is indeed possible, what is that transfer
>> function? (any references to existing literature would be welcome).
>>
>> Thank you for your help.
>
> I am sorry I was late for this discussion. The answer to this is yes,
> and the answer to the second is yes. With a technique designated
> SeDDaRA, the blurred image is compared to a reference image after
> application of an FFT and the transfer function is derived. The
> function is converted into a point spread function via an Inverse
> FFT. Any deconvolution technique can then be used to deblur the
> image. The process is fast compared to iterative tecniques, and at
> least as effective. Examples can be found on our website at
>
http://www.quarktet.com/Gallery1.html as well more info about
> SeDDaRA. Our software program Tria (free-to-try) enables easy
> application of the method.
Where do you get the reference image?
Jerry
--
Engineering is the art of making what you want from things you can get.
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