一、什么是通用文字识别？
通用文字识别是一种技术，它能够将图像中的文字转换为可编辑的文本格式。
二、通用文字识别适用哪些场景？
例如：商业场景
1.广告数据分析：可以识别户外广告、宣传海报上的文字内容，结合大数据分析技术，了解广告投放效果和市场趋势。
2.电商商品信息录入：商家可以通过文字识别快速将商品的说明书、标签等信息录入到电商平台，提高商品上架速度。
3.物流行业：识别快递单上的地址、姓名、电话等信息，实现自动化的物流信息录入和分拣。
三、如何用C#进行通用文字识别接口调用？
下面我们以阿里云为例，通过C#实现调用：
//using System.IO;
//using System.Text;
//using System.Net;
//using System.Net.Security;
//using System.Security.Cryptography.X509Certificates;private const String host = "https://kzwordocr.market.alicloudapi.com";private const String path = "/api-mall/api/general/ocr";private const String method = "POST";private const String appcode = "你自己的AppCode";static void Main(string[] args){String querys = "";String bodys = "image=image&url=url";String url = host + path;HttpWebRequest httpRequest = null;HttpWebResponse httpResponse = null;if (0 < querys.Length){url = url + "?" + querys;}if (host.Contains("https://")){ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult);httpRequest = (HttpWebRequest)WebRequest.CreateDefault(new Uri(url));}else{httpRequest = (HttpWebRequest)WebRequest.Create(url);}httpRequest.Method = method;httpRequest.Headers.Add("Authorization", "APPCODE " + appcode);//根据API的要求，定义相对应的Content-TypehttpRequest.ContentType = "application/x-www-form-urlencoded; charset=UTF-8";if (0 < bodys.Length){byte[] data = Encoding.UTF8.GetBytes(bodys);using (Stream stream = httpRequest.GetRequestStream()){stream.Write(data, 0, data.Length);}}try{httpResponse = (HttpWebResponse)httpRequest.GetResponse();}catch (WebException ex){httpResponse = (HttpWebResponse)ex.Response;}Console.WriteLine(httpResponse.StatusCode);Console.WriteLine(httpResponse.Method);Console.WriteLine(httpResponse.Headers);Stream st = httpResponse.GetResponseStream();StreamReader reader = new StreamReader(st, Encoding.GetEncoding("utf-8"));Console.WriteLine(reader.ReadToEnd());Console.WriteLine("\n");}public static bool CheckValidationResult(object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors errors){return true;}
正确返回示例如下：
{"msg": "成功","success": true,"code": 200,"data": {"orderNo": "202407102026336827870","info": [{"line_no": 0, //文本行编号，按从左至右、从上至下顺序依次排列"confidence": 0.96655273, //行文本识别置信度 0-1 "line_content": "姓名", //识别出的文本行内容"line_position": {"x": 53,"width": 53,"y": 66,"line_direction": 0,"height": 22}},{"line_no": 1,"confidence": 0.98909503,"line_content": "陈海江","line_position": {"x": 102,"width": 63,"y": 63,"line_direction": 0,"height": 23}}]}
}line_no 文本行编号，按从左至右、从上至下顺序依次排列
line_content 识别出的文本行内容
confidence 行文本识别置信度
line_position 文本行位置信息，表示为坐标和旋转角度（左上角X，左上角Y，宽Width，高Height，旋转角度Line Position）+x左上角顶点横坐标X +y 左上角顶点纵坐标Y
width 矩形框的宽
height 矩形框的高
line_direction 文本行的旋转角度
words 文本行内单字符的内容数组，数组元素为一个Json结构，包含character和confidence
character 候选字符character
confidence 单字符的识别置信度
