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    <p>I faced the same problem as you in the preview when using the front camera, because the preview is mirrored and I could not find any good information to scale. </p> <p>The following code is the closest I got. Please note that I have an image defined as property that is called <code>heartImage</code> and that I assume you are using the Apple Sample called SquareCam. </p> <p>In the method <code>- (void)drawFaceBoxesForFeatures:(NSArray *)features forVideoBox:(CGRect)clap orientation:(UIDeviceOrientation)orientation</code></p> <pre><code> if(ff.hasLeftEyePosition) { //swap coordinates CGFloat leftEyeRectOriginX = ff.leftEyePosition.y ; CGFloat leftEyeRectOriginY = ff.leftEyePosition.x ; CGFloat leftEyeRectWidth = faceRect.size.width*0.3; CGFloat leftEyeRectHeight = faceRect.size.width*0.3; //adjust scale leftEyeRectOriginX *= widthScaleBy; leftEyeRectOriginY *= heightScaleBy; NSLog(@"LeftEyePosition: %@", NSStringFromCGPoint(ff.leftEyePosition)); CGRect r = CGRectMake(leftEyeRectOriginX - (leftEyeRectWidth/2) , leftEyeRectOriginY - (leftEyeRectHeight/2), leftEyeRectWidth, leftEyeRectHeight); if ( isMirrored ){ r = CGRectOffset(r, previewBox.origin.x + previewBox.size.width - (rightEyeRectOriginX*2) - rightEyeRectWidth+ faceRect.origin.x, previewBox.origin.y); NSLog(@"LeftEyeRect mirrored: %@", NSStringFromCGRect(r)); } else{ r = CGRectOffset(r, previewBox.origin.x, previewBox.origin.y); } while ( !leftEyeEyeLayer &amp;&amp; (currentSublayer &lt; sublayersCount) ) { CALayer *currentLayer = [sublayers objectAtIndex:currentSublayer++]; if ( [[currentLayer name] isEqualToString:@"LeftEyeLayer"] ) { leftEyeEyeLayer = currentLayer; [currentLayer setHidden:NO]; } } // create a new one if necessary if ( !leftEyeEyeLayer ) { leftEyeEyeLayer = [CALayer new]; [leftEyeEyeLayer setContents:(id)[heartImage CGImage]]; [leftEyeEyeLayer setName:@"LeftEyeLayer"]; [previewLayer addSublayer:leftEyeEyeLayer]; [leftEyeEyeLayer release]; } [leftEyeEyeLayer setFrame:r]; } </code></pre> <p>The same applies for the Right Eye, with the exception that I use this in case it's mirrored: <code>r = CGRectOffset(r, previewBox.origin.x + previewBox.size.width - (rightEyeRectOriginX*2) - rightEyeRectWidth+ faceRect.origin.x, previewBox.origin.y); </code>. The only difference with the sample code is that you first want to remove all the featureLayers, so some lines above my code looks like this:</p> <pre><code> // hide all the face layers for ( CALayer *layer in sublayers ) { if ( [[layer name] isEqualToString:@"FaceLayer"] || [[layer name] isEqualToString:@"LeftEyeLayer"] || [[layer name] isEqualToString:@"RightEyeLayer"] ) [layer setHidden:YES]; } </code></pre> <p>To be precise, I have troubles only in the live camera preview. When using the method to save picture in library (<code>- (CGImageRef)newSquareOverlayedImageForFeatures:(NSArray *)features inCGImage:(CGImageRef)backgroundImage withOrientation:(UIDeviceOrientation)orientation frontFacing:(BOOL)isFrontFacing </code>) it works correctly by using:</p> <pre><code> if(ff.hasLeftEyePosition) { CGRect r = CGRectMake(ff.leftEyePosition.x-faceWidth*0.15, ff.leftEyePosition.y-faceWidth*0.15, faceWidth*0.3, faceWidth*0.3); CGContextDrawImage(bitmapContext, r, [rotatedHeartImage CGImage]); } </code></pre> <p>Please let me know if and how I should improve my answer.</p>
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    1. POHow to detect and show eyes and mouth in camera in iPhone?
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