AIR-OpenCV-Extension

破晓

OpenCV的本机扩展
项目地址：https://github.com/wouterverweirder/AIR-OpenCV-Extension

Copyright (c) 2012, Wouter VerweirderAll rights reserved.

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This AIR Native Extension exposes HAAR cascade executions with OpenCV to Adobe AIR. It's implemented as an asynchronous library and uses a separate thread for the OpenCV execution. This way your AIR application doesn't lock up during the image processing.
First of all, you’ll create an instance of the extension, add a detection listener and load a haar cascade xml file:

1. ///
   
2. openCV = new OpenCV();
   
3. openCV.addEventListener(DetectionEvent.DETECTION_UPDATE, detectionUpdateHandler);
   
4. openCV.loadCascade("/Users/wouter/haarcascades/haarcascade_frontalface_alt2.xml");
   
5. ///

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You will also need to send bitmap data to the extension. In this example, I’m sending a bitmap snapshot of the webcam image to the extension, using the updateImage method. You can also set minimum & maximum sizes for the detection area’s, so area’s smaller then the mnimum size of larger then the maximum size are ignored. I recommend supplying a minimum size for the detection (for example: face must be at least 40×40 pixels), as this will improve performance of the application:

1. ///
   
2. bmpData.draw(video);
   
3. openCV.updateImage(bmpData, minSize, maxSize);
   
4. ///

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In the event handler, you’ll get the detected area’s with the event object that is provided:

1. ///
   
2. protected function detectionUpdateHandler(event:DetectionEvent):void
   
3. {
   
4.         for each(var r:Rectangle in event.rectangles)
   
5.         {
   
6.                 //draw rectangles here
   
7.         }
   
8. }
   
9. ///

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