how to change the pixel value for each of a list of pixels

Hi,

I have a list of pixel's coordinates of 3D binary image (the list's dim: number of pixels to change x 3: the first column is the 'X' coordinate, the second is the 'Y' cooridinate and the third is 'Z' coordinate).

I would like to change each pixel in that list to hold the value of '0' (black color). how can I do it so it won't take too much time?

code examples would be appreciated! :)

Answer 1

[David Hill]

I(m(:,1),m(:,2),m(:,3))=0;

[YA]

thank you for your response! I already tried that - but it takes too much time (I have ~500k pixels to change). Isn't there a fast function for that?

[David Hill]

Are most of the pixels changing to zero? How do you decide which pixels to change (how is your maxtrix formed)?

[YA]

Im using 'regioprops3' to create groups of connected 3d binary volumes inside the 3d image(mask), and I would like to remove the pixels from one of those groups from the 3d mask (by changing their pixels value to 0)