What orientation value re-orients raw images?

OrientationHelper.swift

import UIKit
import AVFoundation

  /** Returns a UIImageOrientation that will adjust an image
  
   - parameter deviceOrientation: physical orientation of the device when the image was captured. Must not be FaceUp or FaceDown
   - parameter position: position of the camera used for capture. Must be .Front or .Back
   
   - returns an UIImageOrientation, which can be used when initializing a UIImageView.
   
   
 
   */
  
  func imageOrientation(forDevicePosition position:AVCaptureDevicePosition,
                                          deviceOrientation:UIDeviceOrientation) -> UIImageOrientation
  {
    switch (deviceOrientation,position) {
    case (.LandscapeRight,.Back): return .Up
    case (.LandscapeRight,.Front): return .Down

    case (.LandscapeLeft,.Back): return .Down
    case (.LandscapeLeft,.Front): return .Up
      
    case (.Portrait,.Back): return .Right
    case (.Portrait,.Front): return .Right

    case (.PortraitUpsideDown,.Back): return .Left
    case (.PortraitUpsideDown,.Front): return .Left
      
    case (.FaceUp,_): fallthrough
    case (.FaceDown,_): fallthrough
    case (_,.Unspecified): fallthrough
    default:
      NSLog("Called in unrecognized orientation")
      return .Left
    }
  }
  
  enum EXIFOrientation : Int32 {
  case topLeft = 1
  case topRight
  case bottomRight
  case bottomLeft
  case leftTop
  case rightTop
  case rightBottom
  case leftBottom
  
  var isReflect:Bool {
    switch self {
    case topLeft,bottomRight,rightTop,leftBottom: return false
    default: return true
    }
  }
}

  /**
   Returns EXIFOrientation that will adjust an image.
   
   - parameter deviceOrientation: physical orientation of the device when the image was captured. Must not be FaceUp or FaceDown
   - parameter position: position of the camera used for capture. Must be .Front or .Back
   
   - returns an EXIFOrientation, whose rawValue can be used as a CGImagePropertyOrientation,
   
   */
  func compensatingEXIFOrientation(forDevicePosition position:AVCaptureDevicePosition,
                                                     deviceOrientation:UIDeviceOrientation) -> EXIFOrientation
  {
    switch (deviceOrientation,position) {
    case (.LandscapeRight,.Back): return .topLeft
    case (.LandscapeRight,.Front): return .bottomRight
    case (.LandscapeLeft,.Back): return .bottomRight
    case (.LandscapeLeft,.Front): return .topLeft
    case (.Portrait,.Back): return .rightTop
    case (.Portrait,.Front): return .rightTop
    case (.PortraitUpsideDown,.Back): return .leftBottom
    case (.PortraitUpsideDown,.Front): return .leftBottom
      
    case (.FaceUp,_): fallthrough
    case (.FaceDown,_): fallthrough
    case (_,.Unspecified): fallthrough
    default:
      NSLog("Called in unrecognized orientation")
      return .rightTop
    }
  }