Detecting face in Swift

Question

I'm a novice to Swift Programming. I'm trying to accomplish face detection using core Graphics. So far I have written the following.

let ciimage=CIImage(contentsOf: "/Users/me/Desktop/test.jpg");            
let accuracy = [CIDetectorAccuracy: CIDetectorAccuracyHigh]
let faceDetector = CIDetector(ofType: CIDetectorTypeFace, context: nil, options: accuracy)


 for face in faces as! [CIFaceFeature] {

 print("Found bounds are \(face.bounds)")
            }

I don't know how to create a cimage from local file.It seems I need to input a URL.. what am I doing wrong, please advice.

UPDATE:

I Have Updated my code referring to the answer provided

let userDirectory = FileManager.default.homeDirectoryForCurrentUser
let desktopDirectory = userDirectory.appendingPathComponent("Desktop")
let pictureUrl = desktopDirectory.appendingPathComponent("test").appendingPathExtension("jpg")

let image = CIImage(contentsOf: pictureUrl)

let faceDetector = CIDetector(ofType: CIDetectorTypeFace, context: nil, options: [CIDetectorAccuracy: CIDetectorAccuracyHigh])
let faces = faceDetector?.features(in: image!) as! [CIFaceFeature]
print("Number of faces: \(faces.count)")

On execution this does not produce any results.

@Leo Dabus .. That question applies to iOS .. this refers to OS X — techno, Sep 13 '17 at 11:14
What is the issue you are experiencing? Is `ciimage` nil? Or do you get an error? — Dávid Pásztor, Sep 13 '17 at 11:18
@DávidPásztor is there a way to create a ciimage from a local file? The code I have written to create the ciimage does not work.It needs to be a URL. — techno, Sep 13 '17 at 11:20

Dávid Pásztor · Accepted Answer · 2017-09-13T11:38:35.913

1

You should use FileManager to retrieve system URL's.

guard let desktopDirectory = FileManager.default.urls(for: .desktopDirectory, in: .userDomainMask).first else {return}
let pictureUrl = desktopDirectory.appendingPathComponent("test").appendingPathExtension("jpg")

let image = CIImage(contentsOf: pictureUrl)

edited Sep 13 '17 at 11:38

answered Sep 13 '17 at 11:21

Dávid Pásztor

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you should use `FileManager.default.urls(for: .desktopDirectory, in: .userDomainMask).first` to get the user desktop url – Leo Dabus Sep 13 '17 at 11:34
@techno what do you mean "this does not provide any results"? Is the `CIImage` `nil`? – Dávid Pásztor Sep 13 '17 at 11:39
Actually it works .. I needed to enable debugging area manually.New to Xcode.. been using VS for a while.So expected the debugging console to be active by default. – techno Sep 13 '17 at 11:42
`if let faces = faceDetector?.features(in: image) as? [CIFaceFeature] {` – Leo Dabus Sep 13 '17 at 11:43
hmm.. do you mind telling me how to show the detected face in an imageview ... :) – techno Sep 13 '17 at 11:46
@techno Feel free to open a new question showing what you have tried while I convert my iOS answer to OSX – Leo Dabus Sep 13 '17 at 11:48
@techno do you need it squared, circled or just cropped? – Leo Dabus Sep 13 '17 at 11:49
@LeoDabus Thanks :) I just need the cropped image to be shown in the image view.. – techno Sep 13 '17 at 11:50
@techno posted the OSX version of my iOS answer below – Leo Dabus Sep 13 '17 at 12:20
@LeoDabus Thanks a lot :) will check it out.Do you need me to post a new question... So that you may post the answer over there.. – techno Sep 13 '17 at 12:29
@techno its is up to you – Leo Dabus Sep 13 '17 at 12:32
1

@LeoDabus I will open a new question. – techno Sep 14 '17 at 04:24
@LeoDabus Need to wait for 12 minutes to accept the answer...Upvoted ! Thanks .. again – techno Sep 14 '17 at 04:38
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/154401/discussion-between-techno-and-leo-dabus). – techno Sep 14 '17 at 04:39

Detecting face in Swift

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