---
title: CIDetectorNumberOfAngles
framework: coreimage
role: symbol
role_heading: Global Variable
path: coreimage/cidetectornumberofangles
---

# CIDetectorNumberOfAngles

The number of perspectives to use for detecting a face in video input.

## Declaration

```swift
let CIDetectorNumberOfAngles: String
```

## Discussion

Discussion The value for this key is an NSNumber object containing the number 1, 3, 5, 7, 9, or 11. At higher numbers of angles, face detection in video becomes more accurate, but at a higher computational cost.

## See Also

### Constants

- [CIDetectorAccuracy](coreimage/cidetectoraccuracy.md)
- [CIDetectorTracking](coreimage/cidetectortracking.md)
- [CIDetectorMinFeatureSize](coreimage/cidetectorminfeaturesize.md)
- [CIDetectorMaxFeatureCount](coreimage/cidetectormaxfeaturecount.md)