opencv problem with bootcamp

jayson

I'm trying to do face detection on a video with opencv on bootcamp (windows 10) and processing 2.2.1

import processing.video.*;

Movie video; import gab.opencv.*; import java.awt.Rectangle;

OpenCV opencv; Rectangle[] faces;

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

video = new Movie(this, "people.mp4"); video.play(); video.loop();
opencv = new OpenCV(this, video.width, video.height); opencv.loadCascade(OpenCV.CASCADE_FRONTALFACE); }

void draw() { background(0); fill(255);
image(video,0,0);
opencv.loadImage(video); faces = opencv.detect();
}

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

It crashes at the line: opencv.loadImage(video);

With the message: IndexOutOfBoundsException: Index 3: Size 0

Any ideas? This works fine on mac osx with the same version of processing.

GoToLoop

https://forum.Processing.org/two/discussion/15473/readme-how-to-format-code-and-text

• The 1st Movie's frame takes some time to get read().
• If we try to access its content before it's fully ready it can crash the sketch! :-SS
• There are some approaches we can take, like checking whether Movie's width or height aren't 0 before calling OpenCV's loadImage() over the Movie instance.
• But my favorite is keeping calling delay() within setup() until we got a non-0 height: \m/

/**
 * Resurfaced Movie (v1.0)
 * GoToLoop (2016-Oct-14)
 * forum.Processing.org/two/discussion/18536/
 * opencv-problem-with-bootcamp#Item_1
 */

import processing.video.Movie;
static final String MOVIE = "people.mp4";
Movie mov;

void setup() {
  (mov = new Movie(this, MOVIE)).play();
  while (mov.height == 0)  delay(10);

  getSurface().setSize(mov.width, mov.height);
  getSurface().setTitle(MOVIE);
}

void draw() {
  background(mov);
}

void movieEvent(final Movie mv) {
  mv.read();
}

jayson

Thanks for the response. That doesn't seem to help though.

The video is loading correctly. The problem seems to be inside opencv.

jeremydouglass

Well, .loadImage is encountering a size 0 array. I'm curious, why do you say it is loading correctly? Do you have separate evidence of that?

• Have you tried another movie file just to see if it is a specific encoding issue?
• Is there demo code for openCV.loadImage that you can start with testing as a baseline?

jayson

The video is playing correctly, if I comment out the openCV.loadImage line it plays correctly on the screen, I've tried several different videos and they produce the same result.

If I put a println just abouve opencv.loadImage to print the width/height of the video it gives the correct size of the video even on the first loop.

Even loading an image and passing that to opencv.loadImage produces the same result...

jeremydouglass

@jayson -- I don't work a lot with movies and opencv in Processing, but according to what I'm seeing in the opencv.loadImage source code, it takes either a filename string or a PImage. Is 'video' a PImage?

By "loading an image ... produces the same result" did you mean that you created a PImage from video first, then passed that to opencv.loadImage(), and it still didn't work?

Re: my suggestion to trying demo code first. There are a lot of opencv-processing examples that use loadImage. Do any of them work for you? If none of them work, perhaps you should report an issue. There may already be a related issue in the open issues list.