Re: Improving the quality of a blocky image

On Jun 9, 5:38=A0am, AJ <arandal...@[EMAIL PROTECTED]
> wrote:
> Hi All,
>
> I have an image which is very blocky (image can be seen
athttp://img222.im=
ageshack.us/my.php?image=3Ddegradedimagesh2.png) and
> would like to try and improve it's quality as much as possible.
>
> 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.
>
> 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.
>
> 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

Is this an improvement?:

http://www.general-cathexis.com/images/degradedimagesh2_2.png

I modeled your image as an 8X nearest neighbor (box) enlargement in
both horizontal and vertical directions. All variation within a block
is horizontal.  In other words, the box model is exact only in the
vertical direction.   I reduced 0.125 X  using box kernel and then
enlarged 8X using a proprietary nonlinear enlargement method available
in SAR Image Processor.