CIFeature Class Reference-优快云博客

CIFeature是Core Image框架的一部分，代表图像中匹配特定标准的部分。此类通常由子类扩展，以提供有关检测到特征的附加信息。每个CIFeature实例包含一个矩形边界和一个类型属性，用于指示检测到的特征种类。

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CIFeature Class Reference

Inherits from	NSObject
Conforms to	NSObject (NSObject)
Framework	Library/Frameworks/ CoreImage.framework
Availability	Available in iOS 5.0 and later.
Declared in	CIFeature.h

Overview

A CIFeature object represents a portion of an image that a detector believes matches its criteria. Subclasses of CIFeature typically hold additional information specific to the detector that discovered the feature.

Tasks

Feature Properties

Properties

bounds

The rectangle that holds discovered feature. (read-only)

    @property(readonly, assign) 
   CGRect bounds
  

Discussion

The rectangle is in the coordinate system of the image.

Availability

Available in iOS 5.0 and later.

Declared In

CIFeature.h

type

The type of feature that was discovered. (read-only)

    @property(readonly, retain) 
   NSString *type
  

Availability

Available in iOS 5.0 and later.

Declared In

CIFeature.h

Constants

Feature Types

Strings that define specific kinds of findable features.

NSString* const CIFeatureTypeFace;

Constants

CIFeatureTypeFace

The discovered feature is a person’s face.

Available in iOS 5.0 and later.

Declared in CIFeature.h.