CIFaceFeature points incorrect
face-detection, ios, objective-c, xcode
Solution
`CIImage` and `UIImage` coordinate systems are inverse, so you have to translate the coordinates. For example:
CGPoint ciMmouthCenter = faceFeature.mouthPosition;
CGPoint uiMmouthCenter;
uiMouthCenter.x = tim.image.size.width - ciMouthCenter.x;
uiMouthCenter.y = tim.image.size.height - ciMouthCenter.y;
Problem
this is just some pretty standard code I have tried. What I am trying to do is place two eyeballs and a mouth on a very stable portrait image. Here is what I have tried: ``` CIImage *image = [CIImage imageWithCGImage: [tim.image CGImage]]; CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeFace context:nil options: [NSDictionary dictionaryWithObject:CIDetectorAccuracyHigh forKey: CIDetectorAccuracy]]; NSArray *feats = [detector featuresInImage: image]; for (CIFaceFeature *faceFeature in feats) { if (faceFeature.hasLeftEyePosition) { eyeLeft.center = faceFeature.leftEyePosition; } if (faceFeature.hasRightEyePosition) { eyeRight.center = faceFeature.rightEyePosition; } if (faceFeature.hasMouthPosition) { moth.center = faceFeature.mouthPosition; } } ``` The problem is my images do translate their center, but to a very awkward position (AKA not the right position)! Although they do appear in a correct distance relation, except mouth is at top. What this means is that there is: A mouth on top, a few centimeters below there are two eyeballs which are a few centimeters apart. So they are scaled correctly according to the image view, they are just in the wrong plac