(VB.NET) AWS Textract Detect Document Text

See more AWS Misc Examples

Detects text in the input document. Amazon Textract can detect lines of text and the words that make up a line of text. The input document must be in one of the following image formats: JPEG, PNG, PDF, or TIFF.

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

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

' This example assumes the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim rest As New Chilkat.Rest


Dim bTls As Boolean = True
Dim port As Integer = 443
Dim bAutoReconnect As Boolean = True
Dim success As Boolean = rest.Connect("textract.us-west-2.amazonaws.com",port,bTls,bAutoReconnect)

' Provide AWS credentials for the REST call.
Dim authAws As New Chilkat.AuthAws
authAws.AccessKey = "AWS_ACCESS_KEY"
authAws.SecretKey = "AWS_SECRET_KEY"
' the region should match our URL above..
authAws.Region = "us-west-2"
authAws.ServiceName = "textract"

rest.SetAuthAws(authAws)

' Use this online tool to generate code from sample JSON:
' Generate Code to Create JSON

Dim json As New Chilkat.JsonObject

' The JSON can contain either the actual bytes of the JPG, PDF, PNG, etc.
' or a reference to the S3 object.
' 
' {
'    "Document": { 
'       "Bytes": blob,
'       "S3Object": { 
'          "Bucket": "string",
'          "Name": "string",
'          "Version": "string"
'       }
'    }
' }

' In this example we'll send the Bytes.  The S3Object is omitted.

Dim bdPng As New Chilkat.BinData
success = bdPng.LoadFile("qa_data/png/image_with_text.png")
If (success = False) Then
    Debug.WriteLine("Failed to load PNG file.")
    Exit Sub
End If


json.UpdateString("Document.Bytes",bdPng.GetEncoded("base64"))

rest.AddHeader("Content-Type","application/x-amz-json-1.1")
rest.AddHeader("X-Amz-Target","Textract.DetectDocumentText")

Dim sbRequestBody As New Chilkat.StringBuilder
json.EmitSb(sbRequestBody)
Dim sbResponseBody As New Chilkat.StringBuilder
success = rest.FullRequestSb("POST","/",sbRequestBody,sbResponseBody)
If (success <> True) Then
    Debug.WriteLine(rest.LastErrorText)
    Exit Sub
End If

Dim respStatusCode As Integer = rest.ResponseStatusCode
Debug.WriteLine("response status code = " & respStatusCode)

Dim jResp As New Chilkat.JsonObject
jResp.EmitCompact = False
jResp.LoadSb(sbResponseBody)

If (respStatusCode >= 400) Then
    Debug.WriteLine("Response Status Code = " & respStatusCode)
    Debug.WriteLine("Response Header:")
    Debug.WriteLine(rest.ResponseHeader)
    Debug.WriteLine("Response Body:")
    Debug.WriteLine(jResp.Emit())
    Exit Sub
End If


Debug.WriteLine("Response Body:")
Debug.WriteLine(jResp.Emit())


' Sample response body is shown below.

' Use this online tool to generate parsing code from sample JSON: 
' Generate Parsing Code from JSON

Dim BlockType As String
Dim Height As String
Dim Left As String
Dim Top As String
Dim Width As String
Dim Id As String
Dim Confidence As String
Dim Text As String
Dim TextType As String
Dim j As Integer
Dim count_j As Integer
Dim X As String
Dim Y As String
Dim v_Type As String
Dim k As Integer
Dim count_k As Integer
Dim strVal As String

Dim DetectDocumentTextModelVersion As String = jResp.StringOf("DetectDocumentTextModelVersion")
Dim Pages As Integer = jResp.IntOf("DocumentMetadata.Pages")
Dim i As Integer = 0
Dim count_i As Integer = jResp.SizeOfArray("Blocks")
While i < count_i
    jResp.I = i
    BlockType = jResp.StringOf("Blocks[i].BlockType")
    Height = jResp.StringOf("Blocks[i].Geometry.BoundingBox.Height")
    Left = jResp.StringOf("Blocks[i].Geometry.BoundingBox.Left")
    Top = jResp.StringOf("Blocks[i].Geometry.BoundingBox.Top")
    Width = jResp.StringOf("Blocks[i].Geometry.BoundingBox.Width")
    Id = jResp.StringOf("Blocks[i].Id")
    Confidence = jResp.StringOf("Blocks[i].Confidence")
    Text = jResp.StringOf("Blocks[i].Text")
    TextType = jResp.StringOf("Blocks[i].TextType")
    j = 0
    count_j = jResp.SizeOfArray("Blocks[i].Geometry.Polygon")
    While j < count_j
        jResp.J = j
        X = jResp.StringOf("Blocks[i].Geometry.Polygon[j].X")
        Y = jResp.StringOf("Blocks[i].Geometry.Polygon[j].Y")
        j = j + 1
    End While
    j = 0
    count_j = jResp.SizeOfArray("Blocks[i].Relationships")
    While j < count_j
        jResp.J = j
        v_Type = jResp.StringOf("Blocks[i].Relationships[j].Type")
        k = 0
        count_k = jResp.SizeOfArray("Blocks[i].Relationships[j].Ids")
        While k < count_k
            jResp.K = k
            strVal = jResp.StringOf("Blocks[i].Relationships[j].Ids[k]")
            k = k + 1
        End While
        j = j + 1
    End While
    i = i + 1
End While




' {
'   "Blocks": [
'     {
'       "BlockType": "PAGE",
'       "Geometry": {
'         "BoundingBox": {
'           "Height": 1.0,
'           "Left": 0.0,
'           "Top": 0.0,
'           "Width": 1.0
'         },
'         "Polygon": [
'           {
'             "X": 7.334237466238847E-7,
'             "Y": 0.0
'           },
'           {
'             "X": 1.0,
'             "Y": 2.065305579890264E-6
'           },
'           {
'             "X": 1.0,
'             "Y": 1.0
'           },
'           {
'             "X": 0.0,
'             "Y": 1.0
'           }
'         ]
'       },
'       "Id": "9d01c4e1-c7ee-46d3-a020-b5d691551542",
'       "Relationships": [
'         {
'           "Ids": [
'             "5d230339-1492-4715-b643-3c1c092b9601",
'             "06eb9de7-c1b2-4de4-83d4-bf14c683bbbc",
'             "e3708093-ddce-4ece-b51b-36e75ee0650a",
'             "0b75416b-4c5a-47ee-af5f-38e86196d09d",
'             "f8e53727-d359-40a1-9c7a-17212be5b62f"
'           ],
'           "Type": "CHILD"
'         }
'       ]
'     },
'     {
'       "BlockType": "LINE",
'       "Confidence": 99.96929168701172,
'       "Geometry": {
'         "BoundingBox": {
'           "Height": 0.1283034384250641,
'           "Left": 0.02562711574137211,
'           "Top": 0.04522315785288811,
'           "Width": 0.7353771924972534
'         },
'         "Polygon": [
'           {
'             "X": 0.025710511952638626,
'             "Y": 0.04522315785288811
'           },
'           {
'             "X": 0.7610043287277222,
'             "Y": 0.04609351605176926
'           },
'           {
'             "X": 0.7609506249427795,
'             "Y": 0.1735266000032425
'           },
'           {
'             "X": 0.02562711574137211,
'             "Y": 0.17263372242450714
'           }
'         ]
'       },
'       "Id": "5d230339-1492-4715-b643-3c1c092b9601",
'       "Relationships": [
'         {
'           "Ids": [
'             "d10275a1-6a07-4df3-836e-b8418c7302e1",
'             "f9394a51-8386-4245-b8f6-a4b8889b16be",
'             "4a422774-0db5-47b1-9d86-486ee4df7bc9",
'             "5018930a-0cb5-4df2-a782-ccb40b98692e",
'             "5decb4b9-fa44-4b74-a410-d753ca9da87e"
'           ],
'           "Type": "CHILD"
'         }
'       ],
'       "Text": "It was the best of"
'     },
'     {
'       "BlockType": "LINE",
'       "Confidence": 99.95220184326172,
'       "Geometry": {
'         "BoundingBox": {
'           "Height": 0.15143845975399017,
'           "Left": 0.02354392223060131,
'           "Top": 0.23623499274253845,
'           "Width": 0.9416812658309937
'         },
'         "Polygon": [
'           {
'             "X": 0.02364235743880272,
'             "Y": 0.23623499274253845
'           },
'           {
'             "X": 0.9652252197265625,
'             "Y": 0.23739269375801086
'           },
'           {
'             "X": 0.9651715755462646,
'             "Y": 0.3876734673976898
'           },
'           {
'             "X": 0.02354392223060131,
'             "Y": 0.38648173213005066
'           }
'         ]
'       },
'       "Id": "06eb9de7-c1b2-4de4-83d4-bf14c683bbbc",
'       "Relationships": [
'         {
'           "Ids": [
'             "df38a25e-1237-4837-9c73-2628cf2a60d6",
'             "4006856d-989a-413a-a19d-ba58464056c7",
'             "0cefb90d-9771-4a62-b47b-f4653f5a5fdc",
'             "b090e2a0-59cb-483a-8489-eb7367c3ec42",
'             "584e024d-cdb8-4991-964a-a6c00a219b4d"
'           ],
'           "Type": "CHILD"
'         }
'       ],
'       "Text": "times, it was the worst"
'     },
'     {
'       "BlockType": "LINE",
'       "Confidence": 99.97298431396484,
'       "Geometry": {
'         "BoundingBox": {
'           "Height": 0.1645825207233429,
'           "Left": 0.023708077147603035,
'           "Top": 0.42446625232696533,
'           "Width": 0.958830714225769
'         },
'         "Polygon": [
'           {
'             "X": 0.023815063759684563,
'             "Y": 0.42446625232696533
'           },
'           {
'             "X": 0.9825388193130493,
'             "Y": 0.42568835616111755
'           },
'           {
'             "X": 0.9824814200401306,
'             "Y": 0.5890488028526306
'           },
'           {
'             "X": 0.023708077147603035,
'             "Y": 0.5877890586853027
'           }
'         ]
'       },
'       "Id": "e3708093-ddce-4ece-b51b-36e75ee0650a",
'       "Relationships": [
'         {
'           "Ids": [
'             "9e7fcad8-5fac-497e-941c-6af065273c4f",
'             "06fa7250-a384-44b1-a821-f4961437dab8",
'             "a5856e1f-1c35-4fd8-9d5c-ec112ce446da",
'             "5d92695a-2ef5-4175-8483-955bdd21c8c5",
'             "145e3940-2b15-4b0f-a1ef-c1eec67bfd34",
'             "979e61b4-b915-4001-8761-e417fb5bcc88"
'           ],
'           "Type": "CHILD"
'         }
'       ],
'       "Text": "of times, it was the age"
'     },
'     {
'       "BlockType": "LINE",
'       "Confidence": 99.92354583740234,
'       "Geometry": {
'         "BoundingBox": {
'           "Height": 0.15201467275619507,
'           "Left": 0.02298363670706749,
'           "Top": 0.6132552623748779,
'           "Width": 0.8867681622505188
'         },
'         "Polygon": [
'           {
'             "X": 0.02308245748281479,
'             "Y": 0.6132552623748779
'           },
'           {
'             "X": 0.909751832485199,
'             "Y": 0.6144257187843323
'           },
'           {
'             "X": 0.9096953868865967,
'             "Y": 0.765269935131073
'           },
'           {
'             "X": 0.02298363670706749,
'             "Y": 0.7640674114227295
'           }
'         ]
'       },
'       "Id": "0b75416b-4c5a-47ee-af5f-38e86196d09d",
'       "Relationships": [
'         {
'           "Ids": [
'             "477b9395-e813-4f47-8f6c-bbc6fd2a1b1d",
'             "cb715516-6798-4db7-922e-aaa05c999497",
'             "ff4bbb55-0ab1-4c91-a910-c44da34f3702",
'             "8eae93f4-70a2-4723-b532-e52dfdde18fc",
'             "7a25756d-68e2-45ec-bef4-f919294fecb3"
'           ],
'           "Type": "CHILD"
'         }
'       ],
'       "Text": "of wisdom, it was the"
'     },
'     {
'       "BlockType": "LINE",
'       "Confidence": 99.92982482910156,
'       "Geometry": {
' 
'         "BoundingBox": {
'           "Height": 0.1690569967031479,
'           "Left": 0.02215408906340599,
'           "Top": 0.7996805906295776,
'           "Width": 0.7357001900672913
'         },
'         "Polygon": [
'           {
'             "X": 0.022264225408434868,
'             "Y": 0.7996805906295776
'           },
'           {
'             "X": 0.7578542828559875,
'             "Y": 0.8006845116615295
'           },
'           {
'             "X": 0.7577832937240601,
'             "Y": 0.9687376022338867
'           },
'           {
'             "X": 0.02215408906340599,
'             "Y": 0.9677039980888367
'           }
'         ]
'       },
'       "Id": "f8e53727-d359-40a1-9c7a-17212be5b62f",
'       "Relationships": [
'         {
'           "Ids": [
'             "5763091d-4807-44b0-94d6-1f6fba7c66ad",
'             "f08b6956-7c97-4877-83e2-f495b3983963",
'             "275f5f9f-fcd6-4447-8242-c6e777fc762a"
'           ],
'           "Type": "CHILD"
'         }
'       ],
'       "Text": "age of foolishness"
'     },
'     {
'       "BlockType": "WORD",
'       "Confidence": 99.95569610595703,
'       "Geometry": {
'         "BoundingBox": {
'           "Height": 0.12361754477024078,
'           "Left": 0.02562711574137211,
'           "Top": 0.049105118960142136,
'           "Width": 0.07332543283700943
'         },
'         "Polygon": [
'           {
'             "X": 0.025707971304655075,
'             "Y": 0.049105118960142136
'           },
'           {
'             "X": 0.09895254671573639,
'             "Y": 0.04919188469648361
'           },
'           {
'             "X": 0.09887456148862839,
'             "Y": 0.17272266745567322
'           },
'           {
'             "X": 0.02562711574137211,
'             "Y": 0.17263372242450714
'           }
'         ]
'       },
'       "Id": "d10275a1-6a07-4df3-836e-b8418c7302e1",
'       "Text": "It",
'       "TextType": "PRINTED"
'     },
'     {
'       "BlockType": "WORD",
'       "Confidence": 99.91895294189453,
'       "Geometry": {
'         "BoundingBox": {
'           "Height": 0.07870253175497055,
'           "Left": 0.12013984471559525,
'           "Top": 0.09188469499349594,
'           "Width": 0.15315164625644684
'         },
'         "Polygon": [
'           {
'             "X": 0.1201888844370842,
'             "Y": 0.09188469499349594
'           },
'           {
'             "X": 0.2732914984226227,
'             "Y": 0.09206762909889221
'           },
'           {
'             "X": 0.27324625849723816,
'             "Y": 0.1705872267484665
'           },
'           {
'             "X": 0.12013984471559525,
'             "Y": 0.17040139436721802
'           }
'         ]
'       },
'       "Id": "f9394a51-8386-4245-b8f6-a4b8889b16be",
'       "Text": "was",
'       "TextType": "PRINTED"
'     },
'     {
'       "BlockType": "WORD",
'       "Confidence": 99.9923095703125,
'       "Geometry": {
'         "BoundingBox": {
'           "Height": 0.12304235994815826,
'           "Left": 0.30181974172592163,
'           "Top": 0.048208922147750854,
'           "Width": 0.13491466641426086
'         },
'         "Polygon": [
'           {
'             "X": 0.30188941955566406,
'             "Y": 0.048208922147750854
'           },
'           {
'             "X": 0.4367344081401825,
'             "Y": 0.04836862161755562
'           },
'           {
'             "X": 0.4366699755191803,
'             "Y": 0.17125128209590912
'           },
'           {
'             "X": 0.30181974172592163,
'             "Y": 0.1710876077413559
'           }
'         ]
'       },
'       "Id": "4a422774-0db5-47b1-9d86-486ee4df7bc9",
'       "Text": "the",
'       "TextType": "PRINTED"
'     },
'     {
'       "BlockType": "WORD",
'       "Confidence": 99.9902114868164,
'       "Geometry": {
'         "BoundingBox": {
'           "Height": 0.12650197744369507,
'           "Left": 0.4637022018432617,
'           "Top": 0.04641735553741455,
'           "Width": 0.17412298917770386
'         },
'         "Polygon": [
'           {
'             "X": 0.46376731991767883,
'             "Y": 0.04641735553741455
'           },
'           {
'             "X": 0.6378251910209656,
'             "Y": 0.046623412519693375
'           },
'           {
'             "X": 0.6377670168876648,
'             "Y": 0.17291933298110962
'           },
'           {
'             "X": 0.4637022018432617,
'             "Y": 0.17270798981189728
'           }
'         ]
'       },
'       "Id": "5018930a-0cb5-4df2-a782-ccb40b98692e",
'       "Text": "best",
'       "TextType": "PRINTED"
'     },
'     {
'       "BlockType": "WORD",
'       "Confidence": 99.98930358886719,
'       "Geometry": {
'         "BoundingBox": {
'           "Height": 0.12482605874538422,
'           "Left": 0.6641513109207153,
'           "Top": 0.04597894102334976,
'           "Width": 0.09685297310352325
'         },
'         "Polygon": [
'           {
'             "X": 0.6642076969146729,
'             "Y": 0.04597894102334976
'           },
'           {
'             "X": 0.7610043287277222,
'             "Y": 0.04609351605176926
'           },
'           {
'             "X": 0.7609517574310303,
'             "Y": 0.17080500721931458
'           },
'           {
'             "X": 0.6641513109207153,
'             "Y": 0.17068752646446228
'           }
'         ]
'       },
'       "Id": "5decb4b9-fa44-4b74-a410-d753ca9da87e",
'       "Text": "of",
'       "TextType": "PRINTED"
'     },
'     {
'       "BlockType": "WORD",
'       "Confidence": 99.94082641601562,
'       "Geometry": {
'         "BoundingBox": {
'           "Height": 0.1432349979877472,
'           "Left": 0.02354392223060131,
'           "Top": 0.24356883764266968,
'           "Width": 0.25458571314811707
'         },
'         "Polygon": [
'           {
'             "X": 0.023637553676962852,
'             "Y": 0.24356883764266968
'           },
'           {
'             "X": 0.2781296372413635,
'             "Y": 0.2438821941614151
'           },
'           {
'             "X": 0.2780475318431854,
'             "Y": 0.38680383563041687
'           },
'           {
'             "X": 0.02354392223060131,
'             "Y": 0.38648173213005066
'           }
'         ]
'       },
'       "Id": "df38a25e-1237-4837-9c73-2628cf2a60d6",
'       "Text": "times,",
'       "TextType": "PRINTED"
'     },
'     {
'       "BlockType": "WORD",
'       "Confidence": 99.98735046386719,
'       "Geometry": {
'         "BoundingBox": {
'           "Height": 0.11849363893270493,
'           "Left": 0.3037284016609192,
'           "Top": 0.24306905269622803,
'           "Width": 0.0635330006480217
'         },
'         "Polygon": [
'           {
'             "X": 0.3037954568862915,
'             "Y": 0.24306905269622803
'           },
'           {
'             "X": 0.3672614097595215,
'             "Y": 0.24314717948436737
'           },
'           {
'             "X": 0.3671967089176178,
'             "Y": 0.36156269907951355
'           },
'           {
'             "X": 0.3037284016609192,
'             "Y": 0.36148273944854736
'           }
'         ]
'       },
'       "Id": "4006856d-989a-413a-a19d-ba58464056c7",
'       "Text": "it",
'       "TextType": "HANDWRITING"
'     },
'     {
'       "BlockType": "WORD",
'       "Confidence": 99.9149398803711,
'       "Geometry": {
'         "BoundingBox": {
'           "Height": 0.08177535980939865,
'           "Left": 0.38862472772598267,
'           "Top": 0.27884912490844727,
'           "Width": 0.15473271906375885
'         },
'         "Polygon": [
'           {
'             "X": 0.3886687457561493,
'             "Y": 0.27884912490844727
'           },
'           {
'             "X": 0.5433574318885803,
'             "Y": 0.2790408730506897
'           },
'           {
'             "X": 0.543317437171936,
'             "Y": 0.3606244921684265
'           },
'           {
'             "X": 0.38862472772598267,
'             "Y": 0.36042970418930054
'           }
'         ]
'       },
'       "Id": "0cefb90d-9771-4a62-b47b-f4653f5a5fdc",
'       "Text": "was",
'       "TextType": "PRINTED"
'     },
'     {
'       "BlockType": "WORD",
'       "Confidence": 99.99311828613281,
'       "Geometry": {
'         "BoundingBox": {
'           "Height": 0.12356647849082947,
'           "Left": 0.5699390172958374,
'           "Top": 0.2369067519903183,
'           "Width": 0.13684332370758057
'         },
'         "Polygon": [
'           {
'             "X": 0.5699985027313232,
'             "Y": 0.2369067519903183
'           },
'           {
'             "X": 0.706782341003418,
'             "Y": 0.23707492649555206
'           },
'           {
'             "X": 0.7067282199859619,
'             "Y": 0.3604732155799866
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