OpenCV Face Detection from A Video File

sankoz

Hi All, I'm trying to do face detection with OpenCV for Processing from a video file. I've searched through examples on the web but all of them seem to be focusing on face detection from a live feed. Is there a way to do it from a video file? I know that you can create Movie objects using the Processing Video library but can I perhaps use that class in an Open CV object? I appreciate any tips and pointers.

kfrajer

https://forum.processing.org/two/discussion/18486/minim-ugens-audiooutput-playnote-only-once#latest

Kf

sankoz

Hi @kfrajer it looks like your example uses Capture class to analyze frames from a video captured via a camera. Let me know if I'm mistaken. What I'm looking for is a way to analyze frames and detect faces from a video file.

kfrajer

Try this with a video with faces:

/**
 * Loop. 
 * 
 * Shows how to load and play a QuickTime movie file.  
 *
 */

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

import processing.video.*;
boolean mousePressedbyUsr=false;

Movie movie;
OpenCV opencv;


void setup() {
  size(640, 360);
  background(0);

  opencv = new OpenCV(this, 640/2, 480/2);
  opencv.loadCascade(OpenCV.CASCADE_FRONTALFACE); 

  // Load and play the video in a loop
  movie = new Movie(this, "transit.mov");
  movie.loop();
  noStroke();
  noSmooth();
}

void movieEvent(Movie m) {
  m.read();
}

void draw() {

  if (movie.available() == true) {
    movie.read();
  }

  if (movie==null)
    return;


  opencv.loadImage(movie);

  image(movie, 0, 0, width, height);
  println( movie.time() + "\t" + frameCount  + "\t" + movie.duration());

  noFill();
  stroke(0, 255, 0);
  strokeWeight(3);
  Rectangle[] faces = opencv.detect();
  println(faces.length);

  for (int i = 0; i < faces.length; i++) {
    println(faces[i].x + "," + faces[i].y);    
    rect(faces[i].x, faces[i].y, faces[i].width, faces[i].height);
  }
}

Kf

sankoz

I'll try that. Thank you.