how to assign zero value to all pixels in an image ?

25 visualizzazioni (ultimi 30 giorni)
assign zero value to pixel

Risposta accettata

Jan
Jan il 11 Set 2013
It depends on what an "image" is. Please post more details in future questions. Fortunately the procedure to set the values to 1 is equal:
Img = rand(1024, 768, 3); % RGB image
Img(:) = 0;
Img2 = randi([0, 255], 1024, 768, 'uint8');
Img2(:) = 0;
  2 Commenti
sheno39
sheno39 il 11 Set 2013
thanks a lot. as am beginner in matlab programming, i do not how to do the code.. i need the code for following function: function computedensity() for x in all pixels p[x] = 0; for n in all pixels less than 3 p[x]+=exp(-(f[x]-f[n])^2
Jan
Jan il 12 Set 2013
Modificato: Jan il 12 Set 2013
This is a completely new question. Please ask it in a new thread.
"for n in all pixels less than 3 " is not clear to me. What is "f"?

Accedi per commentare.

Più risposte (2)

sidra
sidra il 11 Set 2013
I don't understand what purpose setting all the pixel values to zero would achieve.
Nevertheless One of the method is:
You can use two for loops starting from 1 to you image size and the within these loops set the pixel values to zero. Something of this sort
for i=1:n
for j=1:m
img(i,j)=0;
end
end
where n and m are the number of rows and columns respectively.
  2 Commenti
sheno39
sheno39 il 11 Set 2013
thanks for your answer.. how to code the following.. kindly reply.. function computedensity() for x in all pixels p[x] = 0; for n in all pixels less than 3 p[x]+=exp(-(f[x]-f[n])^2
Image Analyst
Image Analyst il 11 Set 2013
% Find all pixels < 3
binaryImage = f < 3; % binaryImage is what you called x
Now, what's f(n)? What is n? In f(x), x is all pixels less than 3. But what is n in f(n)?

Accedi per commentare.


Image Analyst
Image Analyst il 11 Set 2013
Yet another way
grayImage = zeros(size(grayImage), 'uint8');
  1 Commento
sheno39
sheno39 il 11 Set 2013
Modificato: sheno39 il 11 Set 2013
thanks for your help.. can u help me to code the following.. kindly reply.. function computedensity() for x in all pixels p[x] = 0; for n in all pixels less than 3 p[x]+=exp(-(f[x]-f[n])^2

Accedi per commentare.

Categorie

Scopri di più su Shifting and Sorting Matrices in Help Center e File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by