Calculating maximum distance from 3 different points

So I generate a test array and three points (Q) using command window:

pixels = zeros(1,3,3,'uint8');

pixels(:,:,1) = [54,50,45];

pixels(:,:,2) = [48,52,43];

pixels(:,:,3) = [50,41,47];

Q1 = [54,48,50];

Q2 = [50,52,41];

Q3 = [45,43,47];

I use my first function which calculates the median of pixels and this is put into an array e.g P=[54,55,76].

I use my second function to calculate the distance between pixels, which is:

[squaredDistance] = PixelDistance(P,Q)

However, I need to subtract Q1 from P as well as Q2 from P and Q3 from P using squared distance formula e.g

P=[54,55,76]

Q1 = [54,48,50]

[squaredDistance] = PixelDistance(P,Q1)

The question is how do I subtract Q1,Q2, and Q3 given that the function only works with Q?

[Image Analyst]

How is 76 in P the median of any subset of numbers in pixels? It's outside the range of any of them. Also, why are you using a 3-D array for pixels (one row by 3 columns by 3 planes) instead of a normal 3 rows-by-3 columns matrix?

I don't know what PixelDistance() does, but to have it operate on all 3 Q, just pass in all three Q one at a time:

[squaredDistance1] = PixelDistance(P,Q1)
[squaredDistance2] = PixelDistance(P,Q2)
[squaredDistance3] = PixelDistance(P,Q3)

[Sara Foster]

They were just randomly generated numbers, and I could pass all three in, but I was wondering if there was a shorter way?

Answer 1

[Jyotish Kumar]

Hi,

If the code is vectorizable, PixelDistance(P, [Q1;Q2;Q3]) should give the desired output.

If not, to achieve a shorter way to compute the distances w.r.t all Qs at once, the code needs to be vectorized.