Re: Improving the quality of a blocky image

On Jun 9, 6:05 am, AJ <arandal...@xxxxxxxxx> wrote:
Hi All,

http://img222.imageshack.us/my.php?image=degradedimagesh2.png) and

Hawt.

I understand that the image is of such a poor quality that I do not
expect any huge improvements - that is not my aim, my aim is to see if
it can be improved at all, and if so, which method(s) could yield the
best results.

Probably a bi-cubic interpolation engine, which blends pixels together
at the simplest. The more complex processes involve detecting curves,
linear shapes/luminescence patterns and restores some quality in
accordance with aforementioned characteristics.

So far I have tried some iterative restoration techniques such as
Richardson-Lucy deconvolution and Blind deconvolution - both have
proved to give a slight improvement.

I was hoping someone would have some other suggestions as to how I
could possibly improve the image.

There's only so much information you can "guess back" when you've
trashed a portion of it. If I ripped out every 5th letter of this
message, you'd probably be able to guess the missing characters 'cuz
you still have a majority of existing info, but if I took out every
2nd letter... some words you could restore, most you can't cuz they
got multiple possibilities, your picture would be equal to something
like that.

Just in case understanding how the image was degraded in the first
place might help lead to a good suggestion for improvement algorithms,
I created the image using the following steps:

* 8x8 Sub-Block and DCT image
* store top 2 coefficients from each sub-block
* use these to create a new image

Many thanks,

AJ

DCT is beyond me. But your image was degraded by a lossy algorithm --
irreversible. Information was lost, plain and simple.

Just pay an experienced photoshop user to restore your picture by hand.
.

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