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(Visual FoxPro) Amazon Rekognition - Detect Text in an Image
Detects text in the input image and converts it into machine-readable text. This example passes theimage as base64-encoded image bytes. For more information, see https://docs.aws.amazon.com/rekognition/latest/dg/API_DetectText.html
LOCAL loRest
LOCAL lnSuccess
LOCAL loAuthAws
LOCAL lnBTls
LOCAL lnPort
LOCAL lnBAutoReconnect
LOCAL loBdJpg
LOCAL loSbJpg
LOCAL loJson
LOCAL loSbRequestBody
LOCAL loSbResponseBody
LOCAL lnRespStatusCode
LOCAL loJResp
LOCAL lcConfidence
LOCAL lcDetectedText
LOCAL lcGeometryBoundingBoxHeight
LOCAL lcGeometryBoundingBoxLeft
LOCAL lcGeometryBoundingBoxTop
LOCAL lcGeometryBoundingBoxWidth
LOCAL lnId
LOCAL lcV_Type
LOCAL lnParentId
LOCAL j
LOCAL lnCount_j
LOCAL X
LOCAL Y
LOCAL lcTextModelVersion
LOCAL i
LOCAL lnCount_i
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Rest')
loRest = CreateObject('Chilkat.Rest')
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.AuthAws')
loAuthAws = CreateObject('Chilkat.AuthAws')
loAuthAws.AccessKey = "AWS_ACCESS_KEY"
loAuthAws.SecretKey = "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.)
loAuthAws.Region = "us-west-2"
loAuthAws.ServiceName = "rekognition"
* SetAuthAws causes Chilkat to automatically add the following headers: Authorization, X-Amz-Date
loRest.SetAuthAws(loAuthAws)
* URL: https://rekognition.us-west-2.amazonaws.com/
lnBTls = 1
lnPort = 443
lnBAutoReconnect = 1
* Don't forget to change the region domain (us-west-2.amazonaws.com) to your particular region.
lnSuccess = loRest.Connect("rekognition.us-west-2.amazonaws.com",lnPort,lnBTls,lnBAutoReconnect)
IF (lnSuccess <> 1) THEN
? "ConnectFailReason: " + STR(loRest.ConnectFailReason)
? loRest.LastErrorText
RELEASE loRest
RELEASE loAuthAws
CANCEL
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.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.BinData')
loBdJpg = CreateObject('Chilkat.BinData')
lnSuccess = loBdJpg.LoadFile("qa_data/jpg/monday_keep_smiling.jpg")
IF (lnSuccess <> 1) THEN
? "Failed to load the input JPG file."
RELEASE loRest
RELEASE loAuthAws
RELEASE loBdJpg
CANCEL
ENDIF
* We wish to send the following JSON in the body of our HTTP request:
* {
* "Image": {
* "Bytes": "base64_image_bytes"
* }
* }
* 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.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder')
loSbJpg = CreateObject('Chilkat.StringBuilder')
loBdJpg.GetEncodedSb("base64",loSbJpg)
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJson = CreateObject('Chilkat.JsonObject')
loJson.UpdateSb("Image.Bytes",loSbJpg)
loRest.AddHeader("Content-Type","application/x-amz-json-1.1")
loRest.AddHeader("X-Amz-Target","RekognitionService.DetectText")
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder')
loSbRequestBody = CreateObject('Chilkat.StringBuilder')
loJson.EmitSb(loSbRequestBody)
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.StringBuilder')
loSbResponseBody = CreateObject('Chilkat.StringBuilder')
lnSuccess = loRest.FullRequestSb("POST","/",loSbRequestBody,loSbResponseBody)
IF (lnSuccess <> 1) THEN
? loRest.LastErrorText
RELEASE loRest
RELEASE loAuthAws
RELEASE loBdJpg
RELEASE loSbJpg
RELEASE loJson
RELEASE loSbRequestBody
RELEASE loSbResponseBody
CANCEL
ENDIF
lnRespStatusCode = loRest.ResponseStatusCode
? "response status code = " + STR(lnRespStatusCode)
IF (lnRespStatusCode >= 400) THEN
? "Response Status Code = " + STR(lnRespStatusCode)
? "Response Header:"
? loRest.ResponseHeader
? "Response Body:"
? loSbResponseBody.GetAsString()
RELEASE loRest
RELEASE loAuthAws
RELEASE loBdJpg
RELEASE loSbJpg
RELEASE loJson
RELEASE loSbRequestBody
RELEASE loSbResponseBody
CANCEL
ENDIF
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.JsonObject')
loJResp = CreateObject('Chilkat.JsonObject')
loJResp.LoadSb(loSbResponseBody)
loJResp.EmitCompact = 0
? loJResp.Emit()
* Sample JSON response:
* (Sample code for parsing the JSON response is shown below)
* {
* "TextDetections": [
* {
* "Confidence": 95.99308776855469,
* "DetectedText": "( MONDAY IT'S",
* "Geometry": {
* "BoundingBox": {
* "Height": 0.6399821043014526,
* "Left": 0.219133198261261,
* "Top": 0.08677978068590164,
* "Width": 0.7433173656463623
* },
* "Polygon": [
* {
* "X": 0.219133198261261,
* "Y": 0.3588336706161499
* },
* {
* "X": 0.8984103798866272,
* "Y": 0.08677978068590164
* },
* {
* "X": 0.9624505639076233,
* "Y": 0.4547080099582672
* },
* {
* "X": 0.2831733524799347,
* "Y": 0.7267619371414185
* }
* ]
* },
* "Id": 0,
* "Type": "LINE"
* },
* {
* "Confidence": 99.70352172851562,
* "DetectedText": "but keep",
* "Geometry": {
* "BoundingBox": {
* "Height": 0.09703556448221207,
* "Left": 0.6335319876670837,
* "Top": 0.5153074264526367,
* "Width": 0.21070890128612518
* },
* "Polygon": [
* {
* "X": 0.6355597376823425,
* "Y": 0.5153074264526367
* },
* {
* "X": 0.8442409038543701,
* "Y": 0.5266726613044739
* },
* {
* "X": 0.8422132134437561,
* "Y": 0.6123430132865906
* },
* {
* "X": 0.6335319876670837,
* "Y": 0.6009777784347534
* }
* ]
* },
* "Id": 1,
* "Type": "LINE"
* },
* {
* "Confidence": 99.92333984375,
* "DetectedText": "Smiling",
* "Geometry": {
* "BoundingBox": {
* "Height": 0.31578224897384644,
* "Left": 0.5070608258247375,
* "Top": 0.6086956262588501,
* "Width": 0.4795433282852173
* },
* "Polygon": [
* {
* "X": 0.5070608258247375,
* "Y": 0.6298336386680603
* },
* {
* "X": 0.9808917045593262,
* "Y": 0.6086956262588501
* },
* {
* "X": 0.9866041541099548,
* "Y": 0.9033399224281311
* },
* {
* "X": 0.5127732157707214,
* "Y": 0.9244779348373413
* }
* ]
* },
* "Id": 2,
* "Type": "LINE"
* },
* {
* "Confidence": 99.77294158935547,
* "DetectedText": "IT'S",
* "Geometry": {
* "BoundingBox": {
* "Height": 0.09903381764888763,
* "Left": 0.668789803981781,
* "Top": 0.17874395847320557,
* "Width": 0.1449044644832611
* },
* "Polygon": [
* {
* "X": 0.668789803981781,
* "Y": 0.17874395847320557
* },
* {
* "X": 0.8136942386627197,
* "Y": 0.17874395847320557
* },
* {
* "X": 0.8136942386627197,
* "Y": 0.2777777910232544
* },
* {
* "X": 0.668789803981781,
* "Y": 0.2777777910232544
* }
* ]
* },
* "Id": 5,
* "ParentId": 0,
* "Type": "WORD"
* },
* {
* "Confidence": 98.44307708740234,
* "DetectedText": "MONDAY",
* "Geometry": {
* "BoundingBox": {
* "Height": 0.11112251877784729,
* "Left": 0.5541401505470276,
* "Top": 0.3526569902896881,
* "Width": 0.39013487100601196
* },
* "Polygon": [
* {
* "X": 0.5541401505470276,
* "Y": 0.3526569902896881
* },
* {
* "X": 0.9442675113677979,
* "Y": 0.3502415418624878
* },
* {
* "X": 0.9458598494529724,
* "Y": 0.4613526463508606
* },
* {
* "X": 0.5541401505470276,
* "Y": 0.4637681245803833
* }
* ]
* },
* "Id": 4,
* "ParentId": 0,
* "Type": "WORD"
* },
* {
* "Confidence": 99.61898803710938,
* "DetectedText": "but",
* "Geometry": {
* "BoundingBox": {
* "Height": 0.06521739065647125,
* "Left": 0.6353503465652466,
* "Top": 0.5241546034812927,
* "Width": 0.0843949019908905
* },
* "Polygon": [
* {
* "X": 0.6353503465652466,
* "Y": 0.5241546034812927
* },
* {
* "X": 0.7197452187538147,
* "Y": 0.5241546034812927
* },
* {
* "X": 0.7197452187538147,
* "Y": 0.5893719792366028
* },
* {
* "X": 0.6353503465652466,
* "Y": 0.5893719792366028
* }
* ]
* },
* "Id": 6,
* "ParentId": 1,
* "Type": "WORD"
* },
* {
* "Confidence": 99.78804779052734,
* "DetectedText": "keep",
* "Geometry": {
* "BoundingBox": {
* "Height": 0.07971014827489853,
* "Left": 0.7308917045593262,
* "Top": 0.5265700221061707,
* "Width": 0.1114649698138237
* },
* "Polygon": [
* {
* "X": 0.7308917045593262,
* "Y": 0.5265700221061707
* },
* {
* "X": 0.8423566818237305,
* "Y": 0.5265700221061707
* },
* {
* "X": 0.8423566818237305,
* "Y": 0.6062802076339722
* },
* {
* "X": 0.7308917045593262,
* "Y": 0.6062802076339722
* }
* ]
* },
* "Id": 7,
* "ParentId": 1,
* "Type": "WORD"
* },
* {
* "Confidence": 89.76324462890625,
* "DetectedText": "(",
* "Geometry": {
* "BoundingBox": {
* "Height": 0.16401274502277374,
* "Left": 0.27229300141334534,
* "Top": 0.6642512083053589,
* "Width": 0.2850286066532135
* },
* "Polygon": [
* {
* "X": 0.27229300141334534,
* "Y": 0.6642512083053589
* },
* {
* "X": 0.2707006335258484,
* "Y": 0.37922704219818115
* },
* {
* "X": 0.43471336364746094,
* "Y": 0.37922704219818115
* },
* {
* "X": 0.4363057315349579,
* "Y": 0.6642512083053589
* }
* ]
* },
* "Id": 3,
* "ParentId": 0,
* "Type": "WORD"
* },
* {
* "Confidence": 99.92333984375,
* "DetectedText": "Smiling",
* "Geometry": {
* "BoundingBox": {
* "Height": 0.294724702835083,
* "Left": 0.5079618096351624,
* "Top": 0.6304348111152649,
* "Width": 0.4734293222427368
* },
* "Polygon": [
* {
* "X": 0.5079618096351624,
* "Y": 0.6304348111152649
* },
* {
* "X": 0.9808917045593262,
* "Y": 0.6086956262588501
* },
* {
* "X": 0.9856687784194946,
* "Y": 0.9033816456794739
* },
* {
* "X": 0.512738823890686,
* "Y": 0.9227052927017212
* }
* ]
* },
* "Id": 8,
* "ParentId": 2,
* "Type": "WORD"
* }
* ],
* "TextModelVersion": "3.0"
* }
*
*
* Sample code for parsing the JSON response...
* Use the following online tool to generate parsing code from sample JSON:
* Generate Parsing Code from JSON
lcTextModelVersion = loJResp.StringOf("TextModelVersion")
i = 0
lnCount_i = loJResp.SizeOfArray("TextDetections")
DO WHILE i < lnCount_i
loJResp.I = i
lcConfidence = loJResp.StringOf("TextDetections[i].Confidence")
lcDetectedText = loJResp.StringOf("TextDetections[i].DetectedText")
lcGeometryBoundingBoxHeight = loJResp.StringOf("TextDetections[i].Geometry.BoundingBox.Height")
lcGeometryBoundingBoxLeft = loJResp.StringOf("TextDetections[i].Geometry.BoundingBox.Left")
lcGeometryBoundingBoxTop = loJResp.StringOf("TextDetections[i].Geometry.BoundingBox.Top")
lcGeometryBoundingBoxWidth = loJResp.StringOf("TextDetections[i].Geometry.BoundingBox.Width")
lnId = loJResp.IntOf("TextDetections[i].Id")
lcV_Type = loJResp.StringOf("TextDetections[i].Type")
lnParentId = loJResp.IntOf("TextDetections[i].ParentId")
j = 0
lnCount_j = loJResp.SizeOfArray("TextDetections[i].Geometry.Polygon")
DO WHILE j < lnCount_j
loJResp.J = j
X = loJResp.StringOf("TextDetections[i].Geometry.Polygon[j].X")
Y = loJResp.StringOf("TextDetections[i].Geometry.Polygon[j].Y")
j = j + 1
ENDDO
i = i + 1
ENDDO
RELEASE loRest
RELEASE loAuthAws
RELEASE loBdJpg
RELEASE loSbJpg
RELEASE loJson
RELEASE loSbRequestBody
RELEASE loSbResponseBody
RELEASE loJResp
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