# Using opencv with processing
**URL:** https://discourse.processing.org/t/using-opencv-with-processing/14148
**Category:** Libraries
**Created:** [September 23, 2019, 7:31pm UTC](https://discourse.processing.org/t/using-opencv-with-processing/14148 "2019-09-23T19:31:23Z")
**Posts on this page:** 8
**Page:** 1
### Author:  [@maddyna](https://discourse.processing.org/u/maddyna)
#### Post date: [September 23, 2019, 7:31pm UTC](https://discourse.processing.org/t/using-opencv-with-processing/14148/1 "2019-09-23T19:31:23Z")
I intend to use opencv with processing for face detection
while the examples are explicit in how to do face detection on a static image when i am trying to apply that using video from a webcam the method is not working
is thr a tutorial fr that
this hw i tried without much luck-
```auto
import processing.video.*;
import gab.opencv.*;
import java.awt.Rectangle;
OpenCV opencv;
Rectangle[] faces;
Capture video;
void setup() {
size(640,480);
video=new Capture(this,640,480);
video.start();
opencv = new OpenCV(this, video);
opencv.loadCascade(OpenCV.CASCADE_FRONTALFACE);
faces = opencv.detect();
}
void draw() {
if(video.available()){
video.read();
image(opencv.getInput(), 0, 0);
}
noFill();
stroke(0, 255, 0);
strokeWeight(10);
for (int i = 0; i < faces.length; i++) {
rect(faces[i].x, faces[i].y, faces[i].width, faces[i].height);
}
}
```
please help
thanks
---
### Author:  [@F53](https://discourse.processing.org/u/F53)
#### Post date: [September 23, 2019, 9:47pm UTC](https://discourse.processing.org/t/using-opencv-with-processing/14148/2 "2019-09-23T21:47:19Z")
If the video doesn’t need to be live you can use ffmpeg to split the video into frames
---
### Author:  [@maddyna](https://discourse.processing.org/u/maddyna)
#### Post date: [September 24, 2019, 2:24am UTC](https://discourse.processing.org/t/using-opencv-with-processing/14148/3 "2019-09-24T02:24:39Z")
But I want the video to be live
---
### Author:  [@benja](https://discourse.processing.org/u/benja)
#### Post date: [September 24, 2019, 10:22am UTC](https://discourse.processing.org/t/using-opencv-with-processing/14148/4 "2019-09-24T10:22:50Z")
Hey,
1. Please try to format your code properly when posting, otherwise it’s hard to read. (Preformatted Text “\”-icon on the top).
2. I think the opencv-lib is image based and doesn’t handle videos by default. But you can pass the frames of your webcam to opencv with the OPENCV.loadImage() method. Here is an adapted example:
```auto
import processing.video.*;
import gab.opencv.*;
import java.awt.Rectangle;
Capture video;
OpenCV opencv;
Rectangle[] faces;
void setup() {
size(320, 180);
video = new Capture(this, width, height);
video.start();
opencv = new OpenCV(this, video.width, video.height);
opencv.loadCascade(OpenCV.CASCADE_FRONTALFACE);
}
void draw() {
opencv.loadImage(video);
faces = opencv.detect();
image(opencv.getInput(), 0, 0);
noFill();
stroke(0, 255, 0);
strokeWeight(3);
for (int i = 0; i < faces.length; i++) {
rect(faces[i].x, faces[i].y, faces[i].width, faces[i].height);
}
}
void captureEvent(Capture c) {
c.read();
}
```
---
### Author:  [@GoToLoop](https://discourse.processing.org/u/GoToLoop)
#### Post date: [September 24, 2019, 12:33pm UTC](https://discourse.processing.org/t/using-opencv-with-processing/14148/5 "2019-09-24T12:33:24Z")
Lotsa old forum threads about OpenCV::**detect()**: 👼
- [Forum.Processing.org/two/discussions/tagged?Tag=detect()](http://Forum.Processing.org/two/discussions/tagged?Tag=detect%28%29)
---
### Author:  [@maddyna](https://discourse.processing.org/u/maddyna)
#### Post date: [September 25, 2019, 4:46am UTC](https://discourse.processing.org/t/using-opencv-with-processing/14148/6 "2019-09-25T04:46:32Z")
Hi
for computer vision and face detection using the webcam what library should i use in processing.
My programming skills are pretty limited so would like to know of a library that is well documented with tutorial.
---
### Author:  [@benja](https://discourse.processing.org/u/benja)
#### Post date: [September 25, 2019, 9:00am UTC](https://discourse.processing.org/t/using-opencv-with-processing/14148/7 "2019-09-25T09:00:45Z")
Not sure about tutorials. But the opencv-library comes with some examples, which might serve as a starting point: [https://github.com/atduskgreg/opencv-processing](https://github.com/atduskgreg/opencv-processing)
---
### Author:  [@adam9233](https://discourse.processing.org/u/adam9233)
#### Post date: [August 14, 2020, 5:43am UTC](https://discourse.processing.org/t/using-opencv-with-processing/14148/8 "2020-08-14T05:43:33Z")
/_You can may to use LiveCamTest, one of OpenCV libraries, i did use this with a webcam in real-time video, this detect one or two faces at the same time, I hope it helps you!
/
import gab.opencv.;
import processing.video.;
import java.awt._;
Capture video;
OpenCV opencv;
void setup() {
size(640, 480);
video = new Capture(this, 640/2, 480/2);
opencv = new OpenCV(this, 640/2, 480/2);
opencv.loadCascade(OpenCV.CASCADE\_FRONTALFACE);
video.start();
}
void draw() {
scale(2);
opencv.loadImage(video);
image(video, 0, 0 );
noFill();
stroke(#FF0080);
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);
}
}
void captureEvent(Capture c) {
c.read();
}