C#
C#
Google Cloud Vision Text Detection
See more HTTP Misc Examples
Demonstrates 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-textChilkat C# Downloads
bool success = false;
// 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.
Chilkat.BinData imageData = new Chilkat.BinData();
// This image file contains some text...
success = imageData.LoadFile("qa_data/jpg/text.jpg");
if (success != true) {
Debug.WriteLine("Failed to load image file.");
return;
}
// Create the above JSON.
Chilkat.JsonObject json = new Chilkat.JsonObject();
json.UpdateBd("requests[0].image.content","base64",imageData);
json.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
Chilkat.Http http = new Chilkat.Http();
http.SessionLogFilename = "c:/aaworkarea/sessionLog.txt";
Chilkat.StringBuilder sb = new Chilkat.StringBuilder();
string url = "https://vision.googleapis.com/v1/images:annotate?key=YOUR_API_KEY";
Chilkat.HttpResponse resp = new Chilkat.HttpResponse();
success = http.HttpJson("POST",url,json,"application/json",resp);
if (success == false) {
Debug.WriteLine(http.LastErrorText);
return;
}
Debug.WriteLine("status = " + Convert.ToString(resp.StatusCode));
// A 200 response status indicate success.
if (resp.StatusCode != 200) {
Debug.WriteLine(resp.BodyStr);
Debug.WriteLine("Failed.");
return;
}
Chilkat.StringBuilder sbResponseBody = new Chilkat.StringBuilder();
resp.GetBodySb(sbResponseBody);
sbResponseBody.WriteFile("qa_output/textDetectResponse.json","utf-8",false);
json.LoadSb(sbResponseBody);
// 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:
int i;
int count_i;
string fullTextAnnotationText;
int j;
int count_j;
string locale;
string description;
int k;
int count_k;
int x;
int y;
int width;
int height;
string languageCode;
string blockType;
int i1;
int count_i1;
int j1;
int count_j1;
int k1;
int count_k1;
string text;
string propertyDetectedBreakType;
int i2;
int count_i2;
Chilkat.JsonObject json1 = new Chilkat.JsonObject();
Chilkat.JsonObject json2 = new Chilkat.JsonObject();
i = 0;
count_i = json.SizeOfArray("responses");
while (i < count_i) {
json.I = i;
fullTextAnnotationText = json.StringOf("responses[i].fullTextAnnotation.text");
j = 0;
count_j = json.SizeOfArray("responses[i].textAnnotations");
while (j < count_j) {
json.J = j;
locale = json.StringOf("responses[i].textAnnotations[j].locale");
description = json.StringOf("responses[i].textAnnotations[j].description");
k = 0;
count_k = json.SizeOfArray("responses[i].textAnnotations[j].boundingPoly.vertices");
while (k < count_k) {
json.K = k;
x = json.IntOf("responses[i].textAnnotations[j].boundingPoly.vertices[k].x");
y = json.IntOf("responses[i].textAnnotations[j].boundingPoly.vertices[k].y");
k = k + 1;
}
j = j + 1;
}
j = 0;
count_j = json.SizeOfArray("responses[i].fullTextAnnotation.pages");
while (j < count_j) {
json.J = j;
width = json.IntOf("responses[i].fullTextAnnotation.pages[j].width");
height = json.IntOf("responses[i].fullTextAnnotation.pages[j].height");
k = 0;
count_k = json.SizeOfArray("responses[i].fullTextAnnotation.pages[j].property.detectedLanguages");
while (k < count_k) {
json.K = k;
languageCode = json.StringOf("responses[i].fullTextAnnotation.pages[j].property.detectedLanguages[k].languageCode");
k = k + 1;
}
k = 0;
count_k = json.SizeOfArray("responses[i].fullTextAnnotation.pages[j].blocks");
while (k < count_k) {
json.K = k;
blockType = json.StringOf("responses[i].fullTextAnnotation.pages[j].blocks[k].blockType");
json.ObjectOf2("responses[i].fullTextAnnotation.pages[j].blocks[k]",json1);
i1 = 0;
count_i1 = json1.SizeOfArray("property.detectedLanguages");
while (i1 < count_i1) {
json1.I = i1;
languageCode = json1.StringOf("property.detectedLanguages[i].languageCode");
i1 = i1 + 1;
}
json.ObjectOf2("responses[i].fullTextAnnotation.pages[j].blocks[k]",json1);
i1 = 0;
count_i1 = json1.SizeOfArray("boundingBox.vertices");
while (i1 < count_i1) {
json1.I = i1;
x = json1.IntOf("boundingBox.vertices[i].x");
y = json1.IntOf("boundingBox.vertices[i].y");
i1 = i1 + 1;
}
json.ObjectOf2("responses[i].fullTextAnnotation.pages[j].blocks[k]",json1);
i1 = 0;
count_i1 = json1.SizeOfArray("paragraphs");
while (i1 < count_i1) {
json1.I = i1;
j1 = 0;
count_j1 = json1.SizeOfArray("paragraphs[i].property.detectedLanguages");
while (j1 < count_j1) {
json1.J = j1;
languageCode = json1.StringOf("paragraphs[i].property.detectedLanguages[j].languageCode");
j1 = j1 + 1;
}
j1 = 0;
count_j1 = json1.SizeOfArray("paragraphs[i].boundingBox.vertices");
while (j1 < count_j1) {
json1.J = j1;
x = json1.IntOf("paragraphs[i].boundingBox.vertices[j].x");
y = json1.IntOf("paragraphs[i].boundingBox.vertices[j].y");
j1 = j1 + 1;
}
j1 = 0;
count_j1 = json1.SizeOfArray("paragraphs[i].words");
while (j1 < count_j1) {
json1.J = j1;
k1 = 0;
count_k1 = json1.SizeOfArray("paragraphs[i].words[j].property.detectedLanguages");
while (k1 < count_k1) {
json1.K = k1;
languageCode = json1.StringOf("paragraphs[i].words[j].property.detectedLanguages[k].languageCode");
k1 = k1 + 1;
}
k1 = 0;
count_k1 = json1.SizeOfArray("paragraphs[i].words[j].boundingBox.vertices");
while (k1 < count_k1) {
json1.K = k1;
x = json1.IntOf("paragraphs[i].words[j].boundingBox.vertices[k].x");
y = json1.IntOf("paragraphs[i].words[j].boundingBox.vertices[k].y");
k1 = k1 + 1;
}
k1 = 0;
count_k1 = json1.SizeOfArray("paragraphs[i].words[j].symbols");
while (k1 < count_k1) {
json1.K = k1;
text = json1.StringOf("paragraphs[i].words[j].symbols[k].text");
propertyDetectedBreakType = json1.StringOf("paragraphs[i].words[j].symbols[k].property.detectedBreak.type");
json1.ObjectOf2("paragraphs[i].words[j].symbols[k]",json2);
i2 = 0;
count_i2 = json2.SizeOfArray("property.detectedLanguages");
while (i2 < count_i2) {
json2.I = i2;
languageCode = json2.StringOf("property.detectedLanguages[i].languageCode");
i2 = i2 + 1;
}
json1.ObjectOf2("paragraphs[i].words[j].symbols[k]",json2);
i2 = 0;
count_i2 = json2.SizeOfArray("boundingBox.vertices");
while (i2 < count_i2) {
json2.I = i2;
x = json2.IntOf("boundingBox.vertices[i].x");
y = json2.IntOf("boundingBox.vertices[i].y");
i2 = i2 + 1;
}
k1 = k1 + 1;
}
j1 = j1 + 1;
}
i1 = i1 + 1;
}
k = k + 1;
}
j = j + 1;
}
i = i + 1;
}
Debug.WriteLine("Success.");