---
title: Feature Detection Keys
framework: coreimage
role: collectionGroup
role_heading: API Collection
path: coreimage/feature-detection-keys
---

# Feature Detection Keys

Keys used in the options dictionary for features(in:options:).

## Topics

### Constants

- [CIDetectorImageOrientation](coreimage/cidetectorimageorientation.md)
- [CIDetectorEyeBlink](coreimage/cidetectoreyeblink.md)
- [CIDetectorSmile](coreimage/cidetectorsmile.md)
- [CIDetectorFocalLength](coreimage/cidetectorfocallength.md)
- [CIDetectorAspectRatio](coreimage/cidetectoraspectratio.md)
- [CIDetectorReturnSubFeatures](coreimage/cidetectorreturnsubfeatures.md)

## See Also

### Constants

- [Detector Types](coreimage/detector-types.md)
- [Detector Configuration Keys](coreimage/detector-configuration-keys.md)
- [Detector Accuracy Options](coreimage/detector-accuracy-options.md)