POV-Ray : Newsgroups : povray.binaries.images : multiple image_maps as media density-- 'fake' .df3 : Re: multiple image_maps as media density-- 'fake' .df3 Server Time
21 Nov 2024 04:33:51 EST (-0500)
  Re: multiple image_maps as media density-- 'fake' .df3  
From: Kenneth
Date: 27 Oct 2024 12:05:00
Message: <web.671e61fb7fd6ccd91c33a706e066e29@news.povray.org>
yesbird <sya### [at] gmailcom> wrote:
>
> color gradient on your images is not very smooth, compared to
> traditional method, but maybe this is colormap dependent.

Your media images from your earlier post definitely look much nicer than mine.

The main problem I am having is that the original DICOM images from my own CT
scan are *extremely* noisy and of low quality; it is even difficult to see what
is 'organic matter' and what is just noise. And the exposure level from image to
image seems to change at random, which I suspect is a result of the CT's x-rays
being 'auto-compensated' for changes in bone density (or whatever!)

The color_map I used (and the altered gamma setting for the images) was the
result of a lot of experimentation, to see if I could suppress some of the noisy
'garbage' and still retain some of the important details and structures. Small
tweaks to the color_map produce large changes in the visual appearance!

I have attached a sample of my original DICOM images (as converted to
8-bit .png) just to show what the problems are. I think that the images you are
using are of *much* higher quality.

In my opinion, my dentist needs to purchase an improved CT scanner! ;-)

>
> 2. How it will work for isosurface approach?

I am working on that at the moment (thanks for the suggestion!) I will post the
result when finished.

>
> hope you will not need this operation in future.

I hope so too-- mainly because the procedure is EXPENSIVE! $$$


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four_sample_dicom_images_as_8_bit_png.jpg


 

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