NSScreencast Episode #96 Face Detection

Face Detection - NSScreencast

顔認識 画像の目と口にポイントを描く、領域に四角を描く

座標が反対

• CoreImage
  • @import CoreImage;
  • viewDidLoad
    • self.imageView.contentMode = UIViewContentModeScaleAspectFit;
    • dispatch_async
      • CIDetector detectorOfType:CIDetectorTypeFace
        • options:@{ CIDetectorAccuracy : CIDetectorAccuracyHigh }
        • NSArray *features = [detector featuresInImage:ciImage];
  • [CIImage imageWithCGImage:[self.imageView.image CGImage]];
    • dispatch_async(dispatch_get_main_queue(), ^{
      • if ([feature isKindOfClass:[CIFaceFeature class]]) {
        • CIFaceFeature *faceFeature = (CIFaceFeature *)feature;
        • [self.faces addObject:face];
  • drawFaces
    • calculate image scale
      • CGFloat imageScale = fminf(self.imageView.bounds.size.width / imageSize.width,
    • for (FaceView *face in self.faces) {
  • willRotateToInterfaceOrientation
    • face.hidden = YES;
  • didRotateFromInterfaceOrientation
    • [self drawFaces];
• FaceView
  • drawRect
    • CGRect faceRect = self.feature.bounds;
    • CGContextScaleCTM(context, self.scale, self.scale);
    • if ([self.feature hasLeftEyePosition]) {
      • [self drawEyeAtPosition:self.feature.leftEyePosition inContext:context];
    • if ([self.feature hasRightEyePosition]) {
    • if ([self.feature hasMouthPosition]) {
  • drawEyeAtPosition
    • CGContextSaveGState(context);
    • CGContextFillEllipseInRect(context, eyeRect);
    • CGContextRestoreGState(context);
  • drawMouthAtPosition
  • 座標が逆
    • origin - bottom left
    • position = CGPointMake(position.x, self.imageSize.height - position.y);
• favorite guitarist
  • David Jon Gilmour (Pink Floyd)
  • Googleの画像検索 (URL) Google Images

Googleの画像から検索すごい