[PLUG] Figuring out image transformation given source and target image

[Sudhanwa Jogalekar]

Hi,

Looks like there are very basic differences in the images.
vendor jpg image is 1336 × 1336 ppi 8 bit RGB image. And your png image is
52.598 × 52.598 pixels/mm 16 bit but grayscale image.
You might be loosing lot of image information due to selection of grayscale.

You can also use https://pixelcalculator.com for some computation or
references.

HTH
-sudhanwa





On Wed, Dec 29, 2021 at 11:06 PM Mayuresh via plug-mail <
plug-mail at plug.org.in> wrote:

> I have written this[1] software to extract a dental RVG image from an X
> ray sensor connected via USB.
>
> Now I am trying to figure out the image processing required for
> post-processing of the acquired image to match the quality of the vendor
> supplied proprietary software.
>
> [2] is a sample image produced using the vendor software and [3] is the
> raw image acquired using our software mentioned above.
>
> Have tried tweaking brightness, contrast, gamma. These help to some
> extent, but are not sufficient. Further, if I print a map of raw vs
> refined image pixel values, it shows that the transformation is not a
> function of source pixel value alone. There must be some sort of filters
> other than above 3 in use.
>
> Using gimp I have experimented with many of the available filters, but
> could not get satisfactory results.
>
> If there is any digital image processing expert or enthusiast around,
> would appreciate your inputs.
>
> [1] https://github.com/mayureshw/pyrvg
> [2] http://mayuresh.sdfeu.org/byvendor.jpg
> [3] http://mayuresh.sdfeu.org/bypyrvg.png
>
> --
> Mayuresh
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>


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