Face recognition - to visualise hidden background

ViciousR

Hi everyone,

Thank you for looking at my post and hope you can help me. I have a university project and I need to have a hidden background image, and then using face recognition to reveal this image (depending on the location of your face). Here is where I've got so far.

Can't seem to make the background disappear. Thank you in advance

import processing.video.*;
import gab.opencv.*;
import java.awt.*;

PImage photo;
int pixelcount;
color pixelcolor;

Capture firstcam;
OpenCV opencv;

void setup() {
  fullScreen();

  firstcam=new Capture(this, 1600, 900);
  opencv=new OpenCV(this, 1600, 900);
  opencv.loadCascade(OpenCV.CASCADE_FRONTALFACE);
  firstcam.start();
  frameRate(24);
  noFill();

  colorMode(HSB, 360, 100, 100);
  strokeWeight(1);
  smooth();
  photo = loadImage("photo.jpg");
}

void draw() {
  opencv.loadImage(firstcam);
  Rectangle[] faces = opencv.detect();
  image(photo, 0, 0, 1600, 900);
  pushMatrix();
  translate(width, 0);
  scale(-1, 1);

  for (int i = 0 ; i < faces.length ; i++) {
    ellipse(faces[i].x, faces[i].y, faces[i].width, faces[i].height);
    stroke(255,0,0);
    lights();
    smooth();
    strokeWeight(1.5);
  }

  popMatrix();
}

void captureEvent(Capture c) {
  c.read();
}

koogs

edit post, highlight code, press ctrl-o to format.

ViciousR

Thanks, just done :)

koogs

ctrl-t in the editor will indent your code nicely.

ViciousR

Thanks, doesn't seem to do anything.

Anything on the actually coding?

Cheers, R

koogs

ctrl-t in the editor will indent your code nicely.

in the editor, not the forum.

Anything on the actually coding?

it's a mess because it isn't indented 8)

koogs

ok, at home now and i can run that.

basically, Rectangle[] faces = opencv.detect(); is the thing doing all the work. it returns an array of faces that it found. so this will be of 0 length if there is no face, or non-zero if it has.

so, something like

  Rectangle[] faces = opencv.detect();

  ...

  if (faces.length == 0) {
    // nothing found
  } else {
    for (int i=0; i<faces.length; i++) {
      // draw each face
    }
  }

to reveal this image (depending on the location of your face)

this is a bit vague... what do you mean by 'reveal'? revealed all at once? or only the bit where the face is?

koogs

(code tidied, btw)

koogs

btw, this is odd

for (int i = 0; i < faces.length; i++) {
  ellipse(faces[i].x, faces[i].y, faces[i].width, faces[i].height);
  stroke(255, 0, 0);
  lights();
  smooth();
  strokeWeight(1.5);
}

you'd generally set the attributes before calling the ellipse.

in fact, you only need to do it once so you can move everything outside the loop

stroke(255, 0, 0);
lights();
smooth();
strokeWeight(1.5);
for (int i = 0; i < faces.length; i++) {
  ellipse(faces[i].x, faces[i].y, faces[i].width, faces[i].height);
}

maybe even move them into setup given that you don't change them anywhere else

ViciousR

"to reveal this image" (depending on the location of your face)

I mean, reveal only the little where the ellipse from your the face recognition is. so the image can never be revealed all at once, and only revealed where your face is.

Thank you for the advice so far!! :)

TfGuy44

You want to use mask(). Look it up in the reference for examples.

kfrajer

Relevant post

https://forum.processing.org/two/discussion/comment/76980/#Comment_76980

Kf

jeremydouglass

@ViciousR -- also try using Google to search this forum for: video mask, video masking, masking video --example.

I believe there are a number of related projects with example code. Many are based on silhouette / screening / background subtraction, not face detection specifically, but some of the principles are the same.