Re: [Scilab-users] need help with image post processing

Stéphane Mottelet Wed, 15 Jul 2020 13:14:35 -0700

Another possibility: compute the connected components of the green planebitmap image and keep only the largest one. You can use imlabel thenimblobprop (in IPCV):


im=im2bw(imread("G.jpg"),0.5); // I took a screenshot of your G plane image


clf
subplot(1,2,1)
imshow(im)

[im_labeled,n] = imlabel(im);
[a,bb,c] = imblobprop(im_labeled);
[as,k]=gsort(a);
for i=2:n
    im(im_labeled==k(i))=0;
end

subplot(1,2,2)
imshow(im)

S.

Le 15/07/2020 à 20:39, P M a écrit :

Stéphane,

Thanks for the hint.

This is nice for dots being completely surrounded by the green area.

In general there might be cases, where the dots are part of the redand part of the green area.


The result would than be like this:

grafik.png

Appreciate your input.
Philipp

Am Mi., 15. Juli 2020 um 18:21 Uhr schrieb Stéphane Mottelet<stephane.motte...@utc.fr <mailto:stephane.motte...@utc.fr>>:


    Hello,

    Maybe this is not relevant, but if the green region is garanteed
    to be always simply connected, you just have to fill holes in your
    absdiff(G,B) image (imfill function in IPCV).

    S.


    Le 15/07/2020 à 17:58, P M a écrit :

Dear Scilab community,

Thanks to Antoine's functions I am able to read tif-files as M x
N x Channel - matrix.

Px values are:

red => 255, 0, 0
green => 0, 255, 0
black => 0, 0, 0
white => 255, 255, 255

Now: I want to only keep the green pixel values.
This can be done due to: G = img(:,:,2);

However, this plane does also include the white pixels, since
white has a pixel value of 255 in the green plane.
This is Ok, as long as the white pixels are surrounded by the
green area.

However there are also white pixels in the red and black area.
These white pixels should be set to 0.

I started to work with differential images , but somehow I can
not get around the problem.

Please find below an example of my output.

upper line: RGB; R-plane; G-plane ; B-plane

As you can see, the G-plane contains white pixel (2 dots), which
are within the red-area
The desired output would be to have the G-plane without the 2 dots.

Any Idea?

Best Regards,
Philipp

grafik.png

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--Stéphane Mottelet

    Ingénieur de recherche
    EA 4297 Transformations Intégrées de la Matière Renouvelable
    Département Génie des Procédés Industriels
    Sorbonne Universités - Université de Technologie de Compiègne
    CS 60319, 60203 Compiègne cedex
    Tel : +33(0)344234688
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--
Stéphane Mottelet
Ingénieur de recherche
EA 4297 Transformations Intégrées de la Matière Renouvelable
Département Génie des Procédés Industriels
Sorbonne Universités - Université de Technologie de Compiègne
CS 60319, 60203 Compiègne cedex
Tel : +33(0)344234688
http://www.utc.fr/~mottelet

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Re: [Scilab-users] need help with image post processing

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