CoreImage下CIDetector.h自带了四种识别功能
/* 人脸识别 */CORE_IMAGE_EXPORT NSStrig* cost CIDetectorTypeFace NS_AVAILABLE(10_7, 5_0);/* 矩形边缘识别 */CORE_IMAGE_EXPORT NSStrig* cost CIDetectorTypeRectagle NS_AVAILABLE(10_10, 8_0);/* 二维码识别 */CORE_IMAGE_EXPORT NSStrig* cost CIDetectorTypeQRCode NS_AVAILABLE(10_10, 8_0);/* 文本识别 */#if __OBJC2__CORE_IMAGE_EXPORT NSStrig* cost CIDetectorTypeText NS_AVAILABLE(10_11, 9_0);项目采用原生CoreImage框架下CIDetector进行边缘检测
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