Network.AWS.Rekognition.DetectFaces

Detects faces within an image (JPEG or PNG) that is provided as input.

For each face detected, the operation returns face details including a bounding box of the face, a confidence value (that the bounding box contains a face), and a fixed set of attributes such as facial landmarks (for example, coordinates of eye and mouth), gender, presence of beard, sunglasses, etc.

The face-detection algorithm is most effective on frontal faces. For non-frontal or obscured faces, the algorithm may not detect the faces or might detect faces with lower confidence.

For an example, see 'get-started-exercise-detect-faces' .

This operation requires permissions to perform the rekognition:DetectFaces action.

Creating a Request

detectFaces

Arguments

:: Image

dfImage

-> DetectFaces

Creates a value of DetectFaces with the minimum fields required to make a request.

Use one of the following lenses to modify other fields as desired:

• dfAttributes - A list of facial attributes you would like to be returned. By default, the API returns subset of facial attributes. For example, you can specify the value as, [ALL] or [DEFAULT]. If you provide both, [ALL, DEFAULT], the service uses a logical AND operator to determine which attributes to return (in this case, it is all attributes). If you specify all attributes, Rekognition performs additional detection.
• dfImage - The image in which you want to detect faces. You can specify a blob or an S3 object.

data DetectFaces

See: detectFaces smart constructor.

Instances

Eq DetectFaces

Methods

(==) :: DetectFaces -> DetectFaces -> Bool

(/=) :: DetectFaces -> DetectFaces -> Bool

Data DetectFaces

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> DetectFaces -> c DetectFaces

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c DetectFaces

toConstr :: DetectFaces -> Constr

dataTypeOf :: DetectFaces -> DataType

dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c DetectFaces)

dataCast2 :: Typeable (* -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c DetectFaces)

gmapT :: (forall b. Data b => b -> b) -> DetectFaces -> DetectFaces

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> DetectFaces -> r

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> DetectFaces -> r

gmapQ :: (forall d. Data d => d -> u) -> DetectFaces -> [u]

gmapQi :: Int -> (forall d. Data d => d -> u) -> DetectFaces -> u

gmapM :: Monad m => (forall d. Data d => d -> m d) -> DetectFaces -> m DetectFaces

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> DetectFaces -> m DetectFaces

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> DetectFaces -> m DetectFaces

Read DetectFaces

Methods

readsPrec :: Int -> ReadS DetectFaces

readList :: ReadS [DetectFaces]

readPrec :: ReadPrec DetectFaces

readListPrec :: ReadPrec [DetectFaces]

Show DetectFaces

Methods

showsPrec :: Int -> DetectFaces -> ShowS

show :: DetectFaces -> String

showList :: [DetectFaces] -> ShowS

Generic DetectFaces

Associated Types

type Rep DetectFaces :: * -> *

Methods

from :: DetectFaces -> Rep DetectFaces x

to :: Rep DetectFaces x -> DetectFaces

Hashable DetectFaces

Methods

hashWithSalt :: Int -> DetectFaces -> Int

hash :: DetectFaces -> Int

ToJSON DetectFaces

Methods

toJSON :: DetectFaces -> Value

toEncoding :: DetectFaces -> Encoding

toJSONList :: [DetectFaces] -> Value

toEncodingList :: [DetectFaces] -> Encoding

NFData DetectFaces

Methods

rnf :: DetectFaces -> ()

AWSRequest DetectFaces

Associated Types

type Rs DetectFaces :: *

Methods

request :: DetectFaces -> Request DetectFaces

response :: MonadResource m => Logger -> Service -> Proxy * DetectFaces -> ClientResponse -> m (Response DetectFaces)

ToPath DetectFaces

Methods

toPath :: DetectFaces -> ByteString

ToHeaders DetectFaces

Methods

toHeaders :: DetectFaces -> [Header]

ToQuery DetectFaces

Methods

toQuery :: DetectFaces -> QueryString

type Rep DetectFaces

type Rep DetectFaces = D1 (MetaData "DetectFaces" "Network.AWS.Rekognition.DetectFaces" "amazonka-rekognition-1.4.5-JLr9ZFBNFwFGjCyEdV0gv" False) (C1 (MetaCons "DetectFaces'" PrefixI True) ((:*:) (S1 (MetaSel (Just Symbol "_dfAttributes") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 (Maybe [Attribute]))) (S1 (MetaSel (Just Symbol "_dfImage") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 Image))))

type Rs DetectFaces

type Rs DetectFaces = DetectFacesResponse

Request Lenses

dfAttributes :: Lens' DetectFaces [Attribute]

A list of facial attributes you would like to be returned. By default, the API returns subset of facial attributes. For example, you can specify the value as, [ALL] or [DEFAULT]. If you provide both, [ALL, DEFAULT], the service uses a logical AND operator to determine which attributes to return (in this case, it is all attributes). If you specify all attributes, Rekognition performs additional detection.

dfImage :: Lens' DetectFaces Image

The image in which you want to detect faces. You can specify a blob or an S3 object.

Destructuring the Response

detectFacesResponse

Arguments

:: Int

dfrsResponseStatus

-> DetectFacesResponse

Creates a value of DetectFacesResponse with the minimum fields required to make a request.

Use one of the following lenses to modify other fields as desired:

• dfrsOrientationCorrection - The algorithm detects the image orientation. If it detects that the image was rotated, it returns the degrees of rotation. If your application is displaying the image, you can use this value to adjust the orientation. For example, if the service detects that the input image was rotated by 90 degrees, it corrects orientation, performs face detection, and then returns the faces. That is, the bounding box coordinates in the response are based on the corrected orientation.
• dfrsFaceDetails - Details of each face found in the image.
• dfrsResponseStatus - -- | The response status code.

data DetectFacesResponse

See: detectFacesResponse smart constructor.

Instances

Eq DetectFacesResponse

Methods

(==) :: DetectFacesResponse -> DetectFacesResponse -> Bool

(/=) :: DetectFacesResponse -> DetectFacesResponse -> Bool

Data DetectFacesResponse

Methods

gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> DetectFacesResponse -> c DetectFacesResponse

gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c DetectFacesResponse

toConstr :: DetectFacesResponse -> Constr

dataTypeOf :: DetectFacesResponse -> DataType

dataCast1 :: Typeable (* -> *) t => (forall d. Data d => c (t d)) -> Maybe (c DetectFacesResponse)

dataCast2 :: Typeable (* -> * -> *) t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c DetectFacesResponse)

gmapT :: (forall b. Data b => b -> b) -> DetectFacesResponse -> DetectFacesResponse

gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> DetectFacesResponse -> r

gmapQr :: (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> DetectFacesResponse -> r

gmapQ :: (forall d. Data d => d -> u) -> DetectFacesResponse -> [u]

gmapQi :: Int -> (forall d. Data d => d -> u) -> DetectFacesResponse -> u

gmapM :: Monad m => (forall d. Data d => d -> m d) -> DetectFacesResponse -> m DetectFacesResponse

gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> DetectFacesResponse -> m DetectFacesResponse

gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> DetectFacesResponse -> m DetectFacesResponse

Read DetectFacesResponse

Methods

readsPrec :: Int -> ReadS DetectFacesResponse

readList :: ReadS [DetectFacesResponse]

readPrec :: ReadPrec DetectFacesResponse

readListPrec :: ReadPrec [DetectFacesResponse]

Show DetectFacesResponse

Methods

showsPrec :: Int -> DetectFacesResponse -> ShowS

show :: DetectFacesResponse -> String

showList :: [DetectFacesResponse] -> ShowS

Generic DetectFacesResponse

Associated Types

type Rep DetectFacesResponse :: * -> *

Methods

from :: DetectFacesResponse -> Rep DetectFacesResponse x

to :: Rep DetectFacesResponse x -> DetectFacesResponse

NFData DetectFacesResponse

Methods

rnf :: DetectFacesResponse -> ()

type Rep DetectFacesResponse

type Rep DetectFacesResponse = D1 (MetaData "DetectFacesResponse" "Network.AWS.Rekognition.DetectFaces" "amazonka-rekognition-1.4.5-JLr9ZFBNFwFGjCyEdV0gv" False) (C1 (MetaCons "DetectFacesResponse'" PrefixI True) ((:*:) (S1 (MetaSel (Just Symbol "_dfrsOrientationCorrection") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 (Maybe OrientationCorrection))) ((:*:) (S1 (MetaSel (Just Symbol "_dfrsFaceDetails") NoSourceUnpackedness SourceStrict DecidedStrict) (Rec0 (Maybe [FaceDetail]))) (S1 (MetaSel (Just Symbol "_dfrsResponseStatus") NoSourceUnpackedness SourceStrict DecidedUnpack) (Rec0 Int)))))

Response Lenses

dfrsOrientationCorrection :: Lens' DetectFacesResponse (Maybe OrientationCorrection)

The algorithm detects the image orientation. If it detects that the image was rotated, it returns the degrees of rotation. If your application is displaying the image, you can use this value to adjust the orientation. For example, if the service detects that the input image was rotated by 90 degrees, it corrects orientation, performs face detection, and then returns the faces. That is, the bounding box coordinates in the response are based on the corrected orientation.

dfrsFaceDetails :: Lens' DetectFacesResponse [FaceDetail]

Details of each face found in the image.

dfrsResponseStatus :: Lens' DetectFacesResponse Int

• - | The response status code.