Chilkat Examples

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(PureBasic) Amazon Rekognition - Detect Faces in an Image

See more Amazon Rekognition Examples

Detects faces within an image that is provided as input. This example passes theimage as base64-encoded image bytes.

For more information, see https://docs.aws.amazon.com/rekognition/latest/dg/API_DetectFaces.html

Chilkat PureBasic Module Download

Chilkat PureBasic Module

IncludeFile "CkBinData.pb"
IncludeFile "CkStringBuilder.pb"
IncludeFile "CkAuthAws.pb"
IncludeFile "CkJsonObject.pb"
IncludeFile "CkRest.pb"

Procedure ChilkatExample()

    rest.i = CkRest::ckCreate()
    If rest.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success.i

    authAws.i = CkAuthAws::ckCreate()
    If authAws.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkAuthAws::setCkAccessKey(authAws, "AWS_ACCESS_KEY")
    CkAuthAws::setCkSecretKey(authAws, "AWS_SECRET_KEY")
    ; Don't forget to change the region to your particular region. (Also make the same change in the call to Connect below.)
    CkAuthAws::setCkRegion(authAws, "us-west-2")
    CkAuthAws::setCkServiceName(authAws, "rekognition")
    ; SetAuthAws causes Chilkat to automatically add the following headers: Authorization, X-Amz-Date
    CkRest::ckSetAuthAws(rest,authAws)

    ; URL: https://rekognition.us-west-2.amazonaws.com/
    bTls.i = 1
    port.i = 443
    bAutoReconnect.i = 1
    ; Don't forget to change the region domain (us-west-2.amazonaws.com) to your particular region.
    success = CkRest::ckConnect(rest,"rekognition.us-west-2.amazonaws.com",port,bTls,bAutoReconnect)
    If success <> 1
        Debug "ConnectFailReason: " + Str(CkRest::ckConnectFailReason(rest))
        Debug CkRest::ckLastErrorText(rest)
        CkRest::ckDispose(rest)
        CkAuthAws::ckDispose(authAws)
        ProcedureReturn
    EndIf

    ; Note: The above code does not need to be repeatedly called for each REST request.
    ; The rest object can be setup once, and then many requests can be sent.  Chilkat will automatically
    ; reconnect within a FullRequest* method as needed.  It is only the very first connection that is explicitly
    ; made via the Connect method.

    ; Load the JPG to be passed as base64 in the JSON.
    bdJpg.i = CkBinData::ckCreate()
    If bdJpg.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkBinData::ckLoadFile(bdJpg,"qa_data/jpg/kid_blue_coat.jpg")
    If success <> 1
        Debug "Failed to load the input JPG file."
        CkRest::ckDispose(rest)
        CkAuthAws::ckDispose(authAws)
        CkBinData::ckDispose(bdJpg)
        ProcedureReturn
    EndIf

    ; We wish to send the following JSON in the body of our HTTP request:

    ; {
    ;     "Image": {
    ;         "Bytes": "base64_image_bytes"
    ;     }
    ;     "Attributes": [
    ;         "ALL"
    ;     ]
    ; }

    ; Here is the image we used for testing:
    

    ; Convert binary image bytes to base64.
    ; Note: We are explicitly keeping the data inside Chilkat to avoid having to pass large strings
    ; as arguments to function calls.  This is important for some programming languages.
    sbJpg.i = CkStringBuilder::ckCreate()
    If sbJpg.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkBinData::ckGetEncodedSb(bdJpg,"base64",sbJpg)

    json.i = CkJsonObject::ckCreate()
    If json.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkJsonObject::ckUpdateSb(json,"Image.Bytes",sbJpg)
    CkJsonObject::ckUpdateString(json,"Attributes[0]","ALL")

    CkRest::ckAddHeader(rest,"Content-Type","application/x-amz-json-1.1")
    CkRest::ckAddHeader(rest,"X-Amz-Target","RekognitionService.DetectFaces")

    sbRequestBody.i = CkStringBuilder::ckCreate()
    If sbRequestBody.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkJsonObject::ckEmitSb(json,sbRequestBody)
    sbResponseBody.i = CkStringBuilder::ckCreate()
    If sbResponseBody.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkRest::ckFullRequestSb(rest,"POST","/",sbRequestBody,sbResponseBody)
    If success <> 1
        Debug CkRest::ckLastErrorText(rest)
        CkRest::ckDispose(rest)
        CkAuthAws::ckDispose(authAws)
        CkBinData::ckDispose(bdJpg)
        CkStringBuilder::ckDispose(sbJpg)
        CkJsonObject::ckDispose(json)
        CkStringBuilder::ckDispose(sbRequestBody)
        CkStringBuilder::ckDispose(sbResponseBody)
        ProcedureReturn
    EndIf

    respStatusCode.i = CkRest::ckResponseStatusCode(rest)
    Debug "response status code = " + Str(respStatusCode)

    If respStatusCode >= 400
        Debug "Response Status Code = " + Str(respStatusCode)
        Debug "Response Header:"
        Debug CkRest::ckResponseHeader(rest)
        Debug "Response Body:"
        Debug CkStringBuilder::ckGetAsString(sbResponseBody)
        CkRest::ckDispose(rest)
        CkAuthAws::ckDispose(authAws)
        CkBinData::ckDispose(bdJpg)
        CkStringBuilder::ckDispose(sbJpg)
        CkJsonObject::ckDispose(json)
        CkStringBuilder::ckDispose(sbRequestBody)
        CkStringBuilder::ckDispose(sbResponseBody)
        ProcedureReturn
    EndIf

    jResp.i = CkJsonObject::ckCreate()
    If jResp.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkJsonObject::ckLoadSb(jResp,sbResponseBody)

    CkJsonObject::setCkEmitCompact(jResp, 0)
    Debug CkJsonObject::ckEmit(jResp)

    ; Sample JSON response:
    ; (Sample code for parsing the JSON response is shown below)

    ; {
    ;   "FaceDetails": [
    ;     {
    ;       "AgeRange": {
    ;         "High": 18,
    ;         "Low": 8
    ;       },
    ;       "Beard": {
    ;         "Confidence": 98.06282806396484,
    ;         "Value": false
    ;       },
    ;       "BoundingBox": {
    ;         "Height": 0.327279269695282,
    ;         "Left": 0.5339247584342957,
    ;         "Top": 0.23660442233085632,
    ;         "Width": 0.35611653327941895
    ;       },
    ;       "Confidence": 99.99732971191406,
    ;       "Emotions": [
    ;         {
    ;           "Confidence": 99.5849380493164,
    ;           "Type": "HAPPY"
    ;         },
    ;         {
    ;           "Confidence": 0.15533843636512756,
    ;           "Type": "CALM"
    ;         },
    ;         {
    ;           "Confidence": 0.08864031732082367,
    ;           "Type": "SURPRISED"
    ;         },
    ;         {
    ;           "Confidence": 0.05476664379239082,
    ;           "Type": "SAD"
    ;         },
    ;         {
    ;           "Confidence": 0.042048510164022446,
    ;           "Type": "CONFUSED"
    ;         },
    ;         {
    ;           "Confidence": 0.038942769169807434,
    ;           "Type": "DISGUSTED"
    ;         },
    ;         {
    ;           "Confidence": 0.021463459357619286,
    ;           "Type": "FEAR"
    ;         },
    ;         {
    ;           "Confidence": 0.013858155347406864,
    ;           "Type": "ANGRY"
    ;         }
    ;       ],
    ;       "Eyeglasses": {
    ;         "Confidence": 98.5116195678711,
    ;         "Value": false
    ;       },
    ;       "EyesOpen": {
    ;         "Confidence": 99.65477752685547,
    ;         "Value": true
    ;       },
    ;       "Gender": {
    ;         "Confidence": 97.1164321899414,
    ;         "Value": "Female"
    ;       },
    ;       "Landmarks": [
    ;         {
    ;           "Type": "eyeLeft",
    ;           "X": 0.6554790735244751,
    ;           "Y": 0.35153862833976746
    ;         },
    ;         {
    ;           "Type": "eyeRight",
    ;           "X": 0.7940073609352112,
    ;           "Y": 0.38292214274406433
    ;         },
    ;         {
    ;           "Type": "mouthLeft",
    ;           "X": 0.6188991069793701,
    ;           "Y": 0.46431097388267517
    ;         },
    ;         {
    ;           "Type": "mouthRight",
    ;           "X": 0.7352844476699829,
    ;           "Y": 0.490242063999176
    ;         },
    ;         {
    ;           "Type": "nose",
    ;           "X": 0.7125006914138794,
    ;           "Y": 0.44607019424438477
    ;         },
    ;         {
    ;           "Type": "leftEyeBrowLeft",
    ;           "X": 0.6096581220626831,
    ;           "Y": 0.3071737587451935
    ;         },
    ;         {
    ;           "Type": "leftEyeBrowRight",
    ;           "X": 0.6628581285476685,
    ;           "Y": 0.3133310079574585
    ;         },
    ;         {
    ;           "Type": "leftEyeBrowUp",
    ;           "X": 0.7027584314346313,
    ;           "Y": 0.33200803399086
    ;         },
    ;         {
    ;           "Type": "rightEyeBrowLeft",
    ;           "X": 0.7813941240310669,
    ;           "Y": 0.35023579001426697
    ;         },
    ;         {
    ;           "Type": "rightEyeBrowRight",
    ;           "X": 0.8213478922843933,
    ;           "Y": 0.34993964433670044
    ;         },
    ;         {
    ;           "Type": "rightEyeBrowUp",
    ;           "X": 0.8495538234710693,
    ;           "Y": 0.36189284920692444
    ;         },
    ;         {
    ;           "Type": "leftEyeLeft",
    ;           "X": 0.629088282585144,
    ;           "Y": 0.34286588430404663
    ;         },
    ;         {
    ;           "Type": "leftEyeRight",
    ;           "X": 0.6820939183235168,
    ;           "Y": 0.3586524724960327
    ;         },
    ;         {
    ;           "Type": "leftEyeUp",
    ;           "X": 0.6580297946929932,
    ;           "Y": 0.3468707501888275
    ;         },
    ;         {
    ;           "Type": "leftEyeDown",
    ;           "X": 0.6537532210350037,
    ;           "Y": 0.35663917660713196
    ;         },
    ;         {
    ;           "Type": "rightEyeLeft",
    ;           "X": 0.7655976414680481,
    ;           "Y": 0.3776427209377289
    ;         },
    ;         {
    ;           "Type": "rightEyeRight",
    ;           "X": 0.8166338801383972,
    ;           "Y": 0.38544225692749023
    ;         },
    ;         {
    ;           "Type": "rightEyeUp",
    ;           "X": 0.7969376444816589,
    ;           "Y": 0.37844377756118774
    ;         },
    ;         {
    ;           "Type": "rightEyeDown",
    ;           "X": 0.7909533977508545,
    ;           "Y": 0.3877102732658386
    ;         },
    ;         {
    ;           "Type": "noseLeft",
    ;           "X": 0.6727234721183777,
    ;           "Y": 0.44030481576919556
    ;         },
    ;         {
    ;           "Type": "noseRight",
    ;           "X": 0.7237889170646667,
    ;           "Y": 0.45200300216674805
    ;         },
    ;         {
    ;           "Type": "mouthUp",
    ;           "X": 0.6882695555686951,
    ;           "Y": 0.4740942418575287
    ;         },
    ;         {
    ;           "Type": "mouthDown",
    ;           "X": 0.6720560789108276,
    ;           "Y": 0.5046101808547974
    ;         },
    ;         {
    ;           "Type": "leftPupil",
    ;           "X": 0.6554790735244751,
    ;           "Y": 0.35153862833976746
    ;         },
    ;         {
    ;           "Type": "rightPupil",
    ;           "X": 0.7940073609352112,
    ;           "Y": 0.38292214274406433
    ;         },
    ;         {
    ;           "Type": "upperJawlineLeft",
    ;           "X": 0.5517005324363708,
    ;           "Y": 0.30355724692344666
    ;         },
    ;         {
    ;           "Type": "midJawlineLeft",
    ;           "X": 0.5320234894752502,
    ;           "Y": 0.43352627754211426
    ;         },
    ;         {
    ;           "Type": "chinBottom",
    ;           "X": 0.6419994831085205,
    ;           "Y": 0.5531964302062988
    ;         },
    ;         {
    ;           "Type": "midJawlineRight",
    ;           "X": 0.7752369046211243,
    ;           "Y": 0.48957017064094543
    ;         },
    ;         {
    ;           "Type": "upperJawlineRight",
    ;           "X": 0.8515444397926331,
    ;           "Y": 0.37258899211883545
    ;         }
    ;       ],
    ;       "MouthOpen": {
    ;         "Confidence": 68.26280212402344,
    ;         "Value": false
    ;       },
    ;       "Mustache": {
    ;         "Confidence": 99.73213195800781,
    ;         "Value": false
    ;       },
    ;       "Pose": {
    ;         "Pitch": -11.299633026123047,
    ;         "Roll": 17.6924991607666,
    ;         "Yaw": 13.582314491271973
    ;       },
    ;       "Quality": {
    ;         "Brightness": 83.72581481933594,
    ;         "Sharpness": 67.22731018066406
    ;       },
    ;       "Smile": {
    ;         "Confidence": 98.4793930053711,
    ;         "Value": true
    ;       },
    ;       "Sunglasses": {
    ;         "Confidence": 99.3582992553711,
    ;         "Value": false
    ;       }
    ;     }
    ;   ]
    ; }

    ; Sample code for parsing the JSON response...
    ; Use the following online tool to generate parsing code from sample JSON:
    ; Generate Parsing Code from JSON

    AgeRangeHigh.i
    AgeRangeLow.i
    BeardConfidence.s
    BeardValue.i
    BoundingBoxHeight.s
    BoundingBoxLeft.s
    BoundingBoxTop.s
    BoundingBoxWidth.s
    Confidence.s
    EyeglassesConfidence.s
    EyeglassesValue.i
    EyesOpenConfidence.s
    EyesOpenValue.i
    GenderConfidence.s
    GenderValue.s
    MouthOpenConfidence.s
    MouthOpenValue.i
    MustacheConfidence.s
    MustacheValue.i
    PosePitch.s
    PoseRoll.s
    PoseYaw.s
    QualityBrightness.s
    QualitySharpness.s
    SmileConfidence.s
    SmileValue.i
    SunglassesConfidence.s
    SunglassesValue.i
    j.i
    count_j.i
    v_Type.s
    X.s
    Y.s

    i.i = 0
    count_i.i = CkJsonObject::ckSizeOfArray(jResp,"FaceDetails")
    While i < count_i
        CkJsonObject::setCkI(jResp, i)
        AgeRangeHigh = CkJsonObject::ckIntOf(jResp,"FaceDetails[i].AgeRange.High")
        AgeRangeLow = CkJsonObject::ckIntOf(jResp,"FaceDetails[i].AgeRange.Low")
        BeardConfidence = CkJsonObject::ckStringOf(jResp,"FaceDetails[i].Beard.Confidence")
        BeardValue = CkJsonObject::ckBoolOf(jResp,"FaceDetails[i].Beard.Value")
        BoundingBoxHeight = CkJsonObject::ckStringOf(jResp,"FaceDetails[i].BoundingBox.Height")
        BoundingBoxLeft = CkJsonObject::ckStringOf(jResp,"FaceDetails[i].BoundingBox.Left")
        BoundingBoxTop = CkJsonObject::ckStringOf(jResp,"FaceDetails[i].BoundingBox.Top")
        BoundingBoxWidth = CkJsonObject::ckStringOf(jResp,"FaceDetails[i].BoundingBox.Width")
        Confidence = CkJsonObject::ckStringOf(jResp,"FaceDetails[i].Confidence")
        EyeglassesConfidence = CkJsonObject::ckStringOf(jResp,"FaceDetails[i].Eyeglasses.Confidence")
        EyeglassesValue = CkJsonObject::ckBoolOf(jResp,"FaceDetails[i].Eyeglasses.Value")
        EyesOpenConfidence = CkJsonObject::ckStringOf(jResp,"FaceDetails[i].EyesOpen.Confidence")
        EyesOpenValue = CkJsonObject::ckBoolOf(jResp,"FaceDetails[i].EyesOpen.Value")
        GenderConfidence = CkJsonObject::ckStringOf(jResp,"FaceDetails[i].Gender.Confidence")
        GenderValue = CkJsonObject::ckStringOf(jResp,"FaceDetails[i].Gender.Value")
        MouthOpenConfidence = CkJsonObject::ckStringOf(jResp,"FaceDetails[i].MouthOpen.Confidence")
        MouthOpenValue = CkJsonObject::ckBoolOf(jResp,"FaceDetails[i].MouthOpen.Value")
        MustacheConfidence = CkJsonObject::ckStringOf(jResp,"FaceDetails[i].Mustache.Confidence")
        MustacheValue = CkJsonObject::ckBoolOf(jResp,"FaceDetails[i].Mustache.Value")
        PosePitch = CkJsonObject::ckStringOf(jResp,"FaceDetails[i].Pose.Pitch")
        PoseRoll = CkJsonObject::ckStringOf(jResp,"FaceDetails[i].Pose.Roll")
        PoseYaw = CkJsonObject::ckStringOf(jResp,"FaceDetails[i].Pose.Yaw")
        QualityBrightness = CkJsonObject::ckStringOf(jResp,"FaceDetails[i].Quality.Brightness")
        QualitySharpness = CkJsonObject::ckStringOf(jResp,"FaceDetails[i].Quality.Sharpness")
        SmileConfidence = CkJsonObject::ckStringOf(jResp,"FaceDetails[i].Smile.Confidence")
        SmileValue = CkJsonObject::ckBoolOf(jResp,"FaceDetails[i].Smile.Value")
        SunglassesConfidence = CkJsonObject::ckStringOf(jResp,"FaceDetails[i].Sunglasses.Confidence")
        SunglassesValue = CkJsonObject::ckBoolOf(jResp,"FaceDetails[i].Sunglasses.Value")
        j = 0
        count_j = CkJsonObject::ckSizeOfArray(jResp,"FaceDetails[i].Emotions")
        While j < count_j
            CkJsonObject::setCkJ(jResp, j)
            Confidence = CkJsonObject::ckStringOf(jResp,"FaceDetails[i].Emotions[j].Confidence")
            v_Type = CkJsonObject::ckStringOf(jResp,"FaceDetails[i].Emotions[j].Type")
            j = j + 1
        Wend
        j = 0
        count_j = CkJsonObject::ckSizeOfArray(jResp,"FaceDetails[i].Landmarks")
        While j < count_j
            CkJsonObject::setCkJ(jResp, j)
            v_Type = CkJsonObject::ckStringOf(jResp,"FaceDetails[i].Landmarks[j].Type")
            X = CkJsonObject::ckStringOf(jResp,"FaceDetails[i].Landmarks[j].X")
            Y = CkJsonObject::ckStringOf(jResp,"FaceDetails[i].Landmarks[j].Y")
            j = j + 1
        Wend
        i = i + 1
    Wend


    CkRest::ckDispose(rest)
    CkAuthAws::ckDispose(authAws)
    CkBinData::ckDispose(bdJpg)
    CkStringBuilder::ckDispose(sbJpg)
    CkJsonObject::ckDispose(json)
    CkStringBuilder::ckDispose(sbRequestBody)
    CkStringBuilder::ckDispose(sbResponseBody)
    CkJsonObject::ckDispose(jResp)


    ProcedureReturn
EndProcedure

 

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