OCR智能识别身份信息
本人研究了两款OCR智能识别的API，下面做详解！
第一款是百度云的OCR识别，填写配置信息，每天有五百次免费的识别次数，适合中小型客户流量可以使用。API文档：http://ai.baidu.com/docs#/OCR-API/top
public static String Token = ""; // 调用getAccessToken()获取的 access_token建议根据expires_in 时间 设置缓存 private static String clientId = SysConfigManager.Get("bdy_config", "api_key");//"**********"; // 百度云中开通对应服务应用的 API Key 建议开通应用的时候多选服务 private static String clientSecret = SysConfigManager.Get("bdy_config", "Secret_Key");//"***********"; /// <summary> /// 获取百度云 access_token /// </summary> /// <returns></returns> public static string GetbaiduAccessToken() { Token = Convert.ToString(HiCache.Get("access_token")); if (string.IsNullOrEmpty(Token)) { String authHost = "https://aip.baidubce.com/oauth/2.0/token"; HttpClient client = new HttpClient(); List<KeyValuePair<String, String>> paraList = new List<KeyValuePair<string, string>>(); paraList.Add(new KeyValuePair<string, string>("grant_type", "client_credentials")); paraList.Add(new KeyValuePair<string, string>("client_id", clientId)); paraList.Add(new KeyValuePair<string, string>("client_secret", clientSecret)); HttpResponseMessage response = client.PostAsync(authHost, new FormUrlEncodedContent(paraList)).Result; String result = response.Content.ReadAsStringAsync().Result; JObject ResObj = JsonHelper.DeserializeJsonToObject<JObject>(result); if (string.IsNullOrEmpty(Convert.ToString(ResObj.GetValue("access_token")))) { Globals.Debuglog("---获取身份验证access_token失败:" + result, "_IdentifyCard.txt"); return Token; } HiCache.Insert("access_token", ResObj.GetValue("access_token"), 2592000); //access_toke 时效30天，需设置缓存重新获取 Token = ResObj.GetValue("access_token").ToString(); } return Token; } /// <summary> /// 根据access_token获取身份证信息 /// </summary> /// <param name="path"></param> /// <param name="cardside">身份证正反面(front-正面，back-反面)</param> /// <param name="IsDelFile">是否删除图片</param> /// <returns></returns> public static string idcard(string path,string cardside,bool IsDelFile, out string outError) { outError = string.Empty; string token = GetbaiduAccessToken(); if (!string.IsNullOrEmpty(token)) { try { string ext = Path.GetExtension(path).ToLower(); ; if (!ext.Equals(".jpg") && !ext.Equals(".png") && !ext.Equals(".bmp")) { outError = "识别的图片仅支持（jpg、png、bmp）格式"; return ""; } string strbaser64 = Convert.ToBase64String(System.IO.File.ReadAllBytes(path)); string host = "https://aip.baidubce.com/rest/2.0/ocr/v1/idcard?access_token=" + token; Encoding encoding = Encoding.Default; HttpWebRequest request = (HttpWebRequest)WebRequest.Create(host); request.Method = "post"; request.ContentType = "application/x-www-form-urlencoded"; request.KeepAlive = true; String str = "id_card_side="+ cardside + "&image=" + HttpUtility.UrlEncode(strbaser64); byte[] buffer = encoding.GetBytes(str); request.ContentLength = buffer.Length; request.GetRequestStream().Write(buffer, 0, buffer.Length); HttpWebResponse response = (HttpWebResponse)request.GetResponse(); StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8); string result = reader.ReadToEnd(); string StrResult = Getcardinfo(result, cardside,out outError); if (IsDelFile) { File.Delete(path); } return StrResult; } catch (Exception) { outError = "识别异常!"; File.Delete(path); } } return ""; } /// <summary> /// 对返回的身份信息进行打包确认 /// </summary> /// <param name="str"></param> /// <returns></returns> public static string Getcardinfo(string str,string cardside,out string outError) { outError = string.Empty; JObject Obj = JsonHelper.DeserializeJsonToObject<JObject>(str); string status = Convert.ToString(Obj.GetValue("image_status")); string strResult = ""; if (status == "normal") { if (cardside == "front") { IdentifyInfo info = new IdentifyInfo(); info.Address = Obj["words_result"]["住址"]["words"].ToString(); info.DataBirth = Obj["words_result"]["出生"]["words"].ToString(); info.UserName = Obj["words_result"]["姓名"]["words"].ToString(); info.IdCard = Obj["words_result"]["公民身份号码"]["words"].ToString(); info.Sex = Obj["words_result"]["性别"]["words"].ToString(); info.FamousFamily = Obj["words_result"]["民族"]["words"].ToString(); strResult = JsonHelper.SerializeObject(info); } else { strResult = str; } } else { switch (status) { case "reversed_side":outError = "未摆正身份证!";break; case "non_idcard": outError = "上传的图片不是身份证!"; break; case "blurred": outError = "身份证模糊!"; break; case "over_exposure": outError = "身份证关键字段反光或过曝!"; break; default: outError = cardside == "front" ? "请正确上传身份证正面!": "请正确上传身份证背面!"; break; } } return strResult; }
/// <summary> /// 创建临时地址文件 /// </summary> /// <returns></returns> private static string GetPath() { string path = ""; try { path = HttpContext.Current.Request.MapPath("~/Identify"); } catch (Exception e) { path = Utils.ApplicationPath + "/Identify"; } if (!FileHelper.FileExists(path)) { Directory.CreateDirectory(path); } path += "\\" + DateTime.Now.ToString("yyyyMMddHHmmss") + CommonHelper.RandomNum(4); //if (!FileHelper.FileExists(path)) //{ // Directory.CreateDirectory(path); //} return path; }
[Serializable] public class IdentifyInfo { public string Address { get; set; } public string DataBirth { get; set; } public string UserName { get; set; } public string IdCard { get; set; } public string Sex { get; set; } //名族 public string FamousFamily { get; set; } }
第二款是祥云科技的OCR云服务平台，这里的识别更精确一点，但是消费有点贵。API文档：http://www.netocr.com/developers.do?id=4
/// <summary> /// 上传图片到翔云进行身份证识别 /// </summary> /// <param name="filePath">要上传的文件路径</param> /// <returns></returns> public string PostIdCardDataToXiangYun(string filePath) { string url = "http://netocr.com/api/recog.do"; System.Net.Http.HttpClient httpClient = new System.Net.Http.HttpClient(); httpClient.MaxResponseContentBufferSize = 256000; httpClient.DefaultRequestHeaders.Add("user-agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/36.0.1985.143 Safari/537.36"); FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read); System.Net.Http.MultipartFormDataContent content = new System.Net.Http.MultipartFormDataContent(); //增加文件数据 content.Add(new System.Net.Http.StreamContent(fileStream), "file", "idcard.jpg"); //增加参数 content.Add(new StringContent("key************"), "key"); content.Add(new StringContent("secret**********"), "secret"); //二代身份证正面识别 content.Add(new StringContent(CardStatus.TwoIdentityCardsFront.ToString()), "typeId"); content.Add(new StringContent("json"), "format"); System.Net.Http.HttpResponseMessage response = httpClient.PostAsync(new Uri(url), content).Result; string result = response.Content.ReadAsStringAsync().Result; fileStream.Close(); return result; }
