OpenCV Matching Faces Over Time - Face Comparison

flugelhorn

OpenCV Matching Faces Over Time - Face Comparison

in Contributed Library Questions • 1 year ago

Hi everyone,

I'm trying to use Daniel Shiffman's Open CV Matching Faces Over Time for a project that compares when two people are close together. Would anyone know the best way to go about doing this?

Replies(4)

jbum

Re: OpenCV Matching Faces Over Time - Face Comparison

1 year ago

// Compare every pair of faces...

for (int i = 0; i < faceList.size()-1; ++i) {

Face f1 = (Face) faceList.get(i);

for (j = i+1; j < faceList.size(); ++j) {

Face f2 = (Face) faceList.get(j);

// get distance of face centers

float d = dist( f1.r.x+f1.r.width/2, f1.r.y+f1.r.height/2,

f2.r.x+f2.r.width/2, f2.r.y+f2.r.height/2);

// if they don't have a full facewidth of distance between them, they are kinda close...

if (d < (f1.width+f2.width)*1.5) {

// Draw a giant heart around the two faces (f1, f2)

// Leaving this as an exercise to the reader

println(" F1 and F2 sitting in a tree...");

}

flugelhorn

Re: OpenCV Matching Faces Over Time - Face Comparison

1 year ago

Thank you so much for your response. I like the idea of having a heart around the two faces.

What if I were have 4 people on the screen, or even 60? What would be the best way to compare many faces on the screen at the same time?

jbum

Re: OpenCV Matching Faces Over Time - Face Comparison

1 year ago

The example I gave you compares every possible pairing and tells you if they are close. You could use this to cause lightning bolts or hearts to go from person to person. If 6 people were close together, hearts/lightning would go from every person to every other person who is close.

So this code will do it. What it won't do is identify "groupings" or "clusters", but it wouldn't be too hard to add that based on the info you have (e.g. if A is close to B and B is close to C, then A,B,C form a cluster).

flugelhorn

Re: OpenCV Matching Faces Over Time - Face Comparison

1 year ago

Ah, thank you so much!

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