Static CIDetectorImageOrientation 

pub unsafe static CIDetectorImageOrientation: &'static NSString

Available on crate feature CIDetector only.

A dictionary key that configures a Core Image feature detection operation to account for the orientation the image.

This option is used with /CIDetector/featuresInImage:options:

The value of this key is an number object whose value is an integer between 1 and 8. The TIFF and EXIF specifications define the orientation values that describe how the image should be displayed. The default value is 1. For further details, see CGImagePropertyOrientation.

The CIDetectorTypeFace and CIDetectorTypeText can use this option to correctly find faces or text.

Regardless of the orientation values the /CIFeature/bounds-property which is always measured in the cartesean coordinates system of the image that you pass to the detector.

See also Apple’s documentation