构造函数OpenCV未定义

Question

尝试使用OpenCV通过Processing2学习面部识别。此代码是在Jan Vantomme的书中复制的。但是，我使用的是书中列出的OpenCV的更新版本。收到的错误是：构造函数（sketch_ORIGopenCV）未定义。有谁知道OpenCV是不是可以向上兼容，还是导致这个错误的原因是什么？

import gab.opencv.*; //original code in Vantomme's book shows "import hypermedia.video.*;"
                     // I assume thats updated to gab.opencv.* but should still work.
OpenCV opencv;

void setup()
{
  size( 640, 480 );
  opencv = new OpenCV( this );       //  <-----THIS IS THE ERROR LINE*********
  opencv.capture( width, height );
}  

void draw()
{
  opencv.read();
  opencv.flip( OpenCV.flip_HORIZONTAL );
  image( opencv.image(), 0, 0 );
}