Global Variable

CIDetectorImageOrientation

An option for the display orientation of the image whose features you want to detect.

Declaration

NSString *const CIDetectorImageOrientation;

Discussion

The value of this key is an NSNumber object whose value is an integer between 1 and 8. The TIFF and EXIF specifications define these values to indicate where the pixel coordinate origin (0,0) of the image should appear when it is displayed. The default value is 1, indicating that the origin is in the top left corner of the image. For further details, see kCGImagePropertyOrientation.

Core Image detects only faces whose orientation matches that of the image. You should provide a value for this key if you want to detect faces in a different orientation.