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# CIDetector

An image processor that identifies notable features, such as faces and barcodes, in a still image or video.

```
class CIDetector
```

## Overview> Note:
> In macOS 10.13, iOS 11, and tvOS 11 or later, the <doc://com.apple.documentation/documentation/Vision> framework replaces these classes for identifying and analyzing image features. See <doc://com.apple.documentation/documentation/Vision/VNRequest>.

A `CIDetector` object uses image processing to search for and identify notable features (faces, rectangles, and barcodes) in a still image or video. Detected features are represented by [`CIFeature`](/documentation/CoreImage/CIFeature) objects that provide more information about each feature.

This class can maintain many state variables that can impact performance. So for best performance, reuse `CIDetector` instances instead of creating new ones.

## Topics

### Creating a Detector Object

[`init(ofType:context:options:)`](/documentation/CoreImage/CIDetector/init(ofType:context:options:))

Creates and returns a configured detector.

### Using a Detector Object to Find Features

[`features(in:)`](/documentation/CoreImage/CIDetector/features(in:))

Searches for features in an image.

[`features(in:options:)`](/documentation/CoreImage/CIDetector/features(in:options:))

Searches for features in an image based on the specified image orientation.

### Constants

[Detector Types](/documentation/CoreImage/detector-types)

Strings used to declare the detector for which you are interested.

[Detector Configuration Keys](/documentation/CoreImage/detector-configuration-keys)

Keys used in the options dictionary to configure a detector.

[Detector Accuracy Options](/documentation/CoreImage/detector-accuracy-options)

Value options used to specify the desired accuracy of the detector.

[Feature Detection Keys](/documentation/CoreImage/feature-detection-keys)

Keys used in the options dictionary for [`features(in:options:)`](/documentation/CoreImage/CIDetector/features(in:options:)).


---

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