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(Visual FoxPro) Google Cloud Vision Text DetectionDemonstrates calling the Google Cloud Vision for text detection (performs Optical Character Recognition). "Detects and extracts text within an image with support for a broad range of languages. It also features automatic language identification." See https://cloud.google.com/vision/docs/detecting-text
LOCAL loImageData LOCAL lnSuccess LOCAL loJson LOCAL loHttp LOCAL loSb LOCAL lcUrl LOCAL loResp LOCAL loSbResponseBody LOCAL i LOCAL lnCount_i LOCAL lcFullTextAnnotationText LOCAL j LOCAL lnCount_j LOCAL lcLocale LOCAL lcDescription LOCAL k LOCAL lnCount_k LOCAL x LOCAL y LOCAL lnWidth LOCAL lnHeight LOCAL lcLanguageCode LOCAL lcBlockType LOCAL lnI1 LOCAL lnCount_i1 LOCAL loJson1 LOCAL lnJ1 LOCAL lnCount_j1 LOCAL lnK1 LOCAL lnCount_k1 LOCAL lcText LOCAL lcPropertyDetectedBreakType LOCAL lnI2 LOCAL lnCount_i2 LOCAL loJson2 * This example requires the Chilkat API to have been previously unlocked. * See Global Unlock Sample for sample code. * Build the following request: * { * "requests": [ * { * "image": { * "content": "/9j/7QBEUGhvdG9zaG9...base64-encoded-image-content...fXNWzvDEeYxxxzj/Coa6Bax//Z" * }, * "features": [ * { * "type": "TEXT_DETECTION" * } * ] * } * ] * } * Use this online tool to generate the code from sample JSON: * Generate Code to Create JSON * Load an image file. loImageData = CreateObject('Chilkat_9_5_0.BinData') * This image file contains some text... lnSuccess = loImageData.LoadFile("qa_data/jpg/text.jpg") IF (lnSuccess <> 1) THEN ? "Failed to load image file." RELEASE loImageData CANCEL ENDIF * Create the above JSON. loJson = CreateObject('Chilkat_9_5_0.JsonObject') loJson.UpdateBd("requests[0].image.content","base64",loImageData) loJson.UpdateString("requests[0].features[0].type","TEXT_DETECTION") * Send the following POST with the HTTP request body containing the above JSON. * POST https://vision.googleapis.com/v1/images:annotate?key=YOUR_API_KEY loHttp = CreateObject('Chilkat_9_5_0.Http') loSb = CreateObject('Chilkat_9_5_0.StringBuilder') lcUrl = "https://vision.googleapis.com/v1/images:annotate?key=YOUR_API_KEY" loResp = loHttp.PostJson3(lcUrl,"application/json",loJson) IF (loHttp.LastMethodSuccess <> 1) THEN ? loHttp.LastErrorText RELEASE loImageData RELEASE loJson RELEASE loHttp RELEASE loSb CANCEL ENDIF ? "status = " + STR(loResp.StatusCode) * A 200 response status indicate success. IF (loResp.StatusCode <> 200) THEN ? loResp.BodyStr ? "Failed." RELEASE loResp RELEASE loImageData RELEASE loJson RELEASE loHttp RELEASE loSb CANCEL ENDIF loSbResponseBody = CreateObject('Chilkat_9_5_0.StringBuilder') loResp.GetBodySb(loSbResponseBody) loSbResponseBody.WriteFile("qa_output/textDetectResponse.json","utf-8",0) loJson.LoadSb(loSbResponseBody) * The response is a JSON document like this: * Use this online tool to generate parsing code from sample JSON: * Generate Parsing Code from JSON * { * "responses": [ * { * "textAnnotations": [ * { * "locale": "en", * "description": "Chilkat is a cross-language, cross-platform\nAPl providing 90+ classes for many Internet\nprotocols, formats, and algorithms.\n", * "boundingPoly": { * "vertices": [ * { * "x": 17, * "y": 14 * }, * ... * ] * } * ], * "text": "Chilkat is a cross-language, cross-platform\nAPl providing 90+ classes for many Internet\nprotocols, formats, and algorithms.\n" * } * } * ] * } * The parsing code generated from the online tool: i = 0 lnCount_i = loJson.SizeOfArray("responses") DO WHILE i < lnCount_i loJson.I = i lcFullTextAnnotationText = loJson.StringOf("responses[i].fullTextAnnotation.text") j = 0 lnCount_j = loJson.SizeOfArray("responses[i].textAnnotations") DO WHILE j < lnCount_j loJson.J = j lcLocale = loJson.StringOf("responses[i].textAnnotations[j].locale") lcDescription = loJson.StringOf("responses[i].textAnnotations[j].description") k = 0 lnCount_k = loJson.SizeOfArray("responses[i].textAnnotations[j].boundingPoly.vertices") DO WHILE k < lnCount_k loJson.K = k x = loJson.IntOf("responses[i].textAnnotations[j].boundingPoly.vertices[k].x") y = loJson.IntOf("responses[i].textAnnotations[j].boundingPoly.vertices[k].y") k = k + 1 ENDDO j = j + 1 ENDDO j = 0 lnCount_j = loJson.SizeOfArray("responses[i].fullTextAnnotation.pages") DO WHILE j < lnCount_j loJson.J = j lnWidth = loJson.IntOf("responses[i].fullTextAnnotation.pages[j].width") lnHeight = loJson.IntOf("responses[i].fullTextAnnotation.pages[j].height") k = 0 lnCount_k = loJson.SizeOfArray("responses[i].fullTextAnnotation.pages[j].property.detectedLanguages") DO WHILE k < lnCount_k loJson.K = k lcLanguageCode = loJson.StringOf("responses[i].fullTextAnnotation.pages[j].property.detectedLanguages[k].languageCode") k = k + 1 ENDDO k = 0 lnCount_k = loJson.SizeOfArray("responses[i].fullTextAnnotation.pages[j].blocks") DO WHILE k < lnCount_k loJson.K = k lcBlockType = loJson.StringOf("responses[i].fullTextAnnotation.pages[j].blocks[k].blockType") loJson1 = loJson.ObjectOf("responses[i].fullTextAnnotation.pages[j].blocks[k]") lnI1 = 0 lnCount_i1 = loJson1.SizeOfArray("property.detectedLanguages") DO WHILE lnI1 < lnCount_i1 loJson1.I = lnI1 lcLanguageCode = loJson1.StringOf("property.detectedLanguages[i].languageCode") lnI1 = lnI1 + 1 ENDDO RELEASE loJson1 loJson1 = loJson.ObjectOf("responses[i].fullTextAnnotation.pages[j].blocks[k]") lnI1 = 0 lnCount_i1 = loJson1.SizeOfArray("boundingBox.vertices") DO WHILE lnI1 < lnCount_i1 loJson1.I = lnI1 x = loJson1.IntOf("boundingBox.vertices[i].x") y = loJson1.IntOf("boundingBox.vertices[i].y") lnI1 = lnI1 + 1 ENDDO RELEASE loJson1 loJson1 = loJson.ObjectOf("responses[i].fullTextAnnotation.pages[j].blocks[k]") lnI1 = 0 lnCount_i1 = loJson1.SizeOfArray("paragraphs") DO WHILE lnI1 < lnCount_i1 loJson1.I = lnI1 lnJ1 = 0 lnCount_j1 = loJson1.SizeOfArray("paragraphs[i].property.detectedLanguages") DO WHILE lnJ1 < lnCount_j1 loJson1.J = lnJ1 lcLanguageCode = loJson1.StringOf("paragraphs[i].property.detectedLanguages[j].languageCode") lnJ1 = lnJ1 + 1 ENDDO lnJ1 = 0 lnCount_j1 = loJson1.SizeOfArray("paragraphs[i].boundingBox.vertices") DO WHILE lnJ1 < lnCount_j1 loJson1.J = lnJ1 x = loJson1.IntOf("paragraphs[i].boundingBox.vertices[j].x") y = loJson1.IntOf("paragraphs[i].boundingBox.vertices[j].y") lnJ1 = lnJ1 + 1 ENDDO lnJ1 = 0 lnCount_j1 = loJson1.SizeOfArray("paragraphs[i].words") DO WHILE lnJ1 < lnCount_j1 loJson1.J = lnJ1 lnK1 = 0 lnCount_k1 = loJson1.SizeOfArray("paragraphs[i].words[j].property.detectedLanguages") DO WHILE lnK1 < lnCount_k1 loJson1.K = lnK1 lcLanguageCode = loJson1.StringOf("paragraphs[i].words[j].property.detectedLanguages[k].languageCode") lnK1 = lnK1 + 1 ENDDO lnK1 = 0 lnCount_k1 = loJson1.SizeOfArray("paragraphs[i].words[j].boundingBox.vertices") DO WHILE lnK1 < lnCount_k1 loJson1.K = lnK1 x = loJson1.IntOf("paragraphs[i].words[j].boundingBox.vertices[k].x") y = loJson1.IntOf("paragraphs[i].words[j].boundingBox.vertices[k].y") lnK1 = lnK1 + 1 ENDDO lnK1 = 0 lnCount_k1 = loJson1.SizeOfArray("paragraphs[i].words[j].symbols") DO WHILE lnK1 < lnCount_k1 loJson1.K = lnK1 lcText = loJson1.StringOf("paragraphs[i].words[j].symbols[k].text") lcPropertyDetectedBreakType = loJson1.StringOf("paragraphs[i].words[j].symbols[k].property.detectedBreak.type") loJson2 = loJson1.ObjectOf("paragraphs[i].words[j].symbols[k]") lnI2 = 0 lnCount_i2 = loJson2.SizeOfArray("property.detectedLanguages") DO WHILE lnI2 < lnCount_i2 loJson2.I = lnI2 lcLanguageCode = loJson2.StringOf("property.detectedLanguages[i].languageCode") lnI2 = lnI2 + 1 ENDDO RELEASE loJson2 loJson2 = loJson1.ObjectOf("paragraphs[i].words[j].symbols[k]") lnI2 = 0 lnCount_i2 = loJson2.SizeOfArray("boundingBox.vertices") DO WHILE lnI2 < lnCount_i2 loJson2.I = lnI2 x = loJson2.IntOf("boundingBox.vertices[i].x") y = loJson2.IntOf("boundingBox.vertices[i].y") lnI2 = lnI2 + 1 ENDDO RELEASE loJson2 lnK1 = lnK1 + 1 ENDDO lnJ1 = lnJ1 + 1 ENDDO lnI1 = lnI1 + 1 ENDDO RELEASE loJson1 k = k + 1 ENDDO j = j + 1 ENDDO i = i + 1 ENDDO RELEASE loResp ? "Success." RELEASE loImageData RELEASE loJson RELEASE loHttp RELEASE loSb RELEASE loSbResponseBody |
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