自定義模板文字識別服務簡介

說明

Hi，您好，歡迎使用有道智云自定義模版文字識別 API 接口服務。

本文檔主要針對需要集成 API 的技術開發(fā)工程師，詳細描述自定義模版文字識別能力相關的技術內(nèi)容。

如果您有與我們商務合作的需求，可以通過以下方式聯(lián)系我們：

商務郵箱： AIcloud_Business@corp.youdao.com

如果您對文檔內(nèi)容有任何疑問，可以通過以下幾種方式聯(lián)系我們：

客服 QQ：1906538062

智云 OCR 技術交流 QQ 1 群: 654064748

智云 OCR 技術交流 QQ 2 群: 471638046

聯(lián)系郵箱： zhiyun@corp.youdao.com

溫馨提示：

本文檔主要針對開發(fā)人員，接入測試前需要獲取應用ID和應用密鑰；如果您還沒有，請按照 新手指南 操作。

平臺向每個賬戶贈送 50 元的體驗金，供用戶集成前測試所用，具體資費規(guī)則詳見 自定義模版文字服務報價 。

接口說明

自定義模板文字識別 API HTTPS 地址：

https://openapi.youdao.com/iocr

協(xié)議須知

調(diào)用方在集成自定義模板文字識別 API 時，請遵循以下規(guī)則。

接口調(diào)用參數(shù)

調(diào)用 API 需要向接口發(fā)送以下字段來訪問服務。

簽名生成方法如下： signType=v3； sign=sha256(應用ID+input+salt+curtime+應用密鑰)。 其中，input 的計算方式為：input=q前10個字符 + q長度 + q后10個字符（當 q 長度大于 20）或 input=q字符串（當 q 長度小于等于 20）。

• 不同語言獲取時間戳，請參看此鏈接

如果對簽名有疑問，可以參看文檔末尾各語言 demo。

輸出結(jié)果

返回的結(jié)果是 json 格式，具體說明如下

示例

識別的返回結(jié)果：

{
  "errorCode": "0",
  "Result": {
    "template_id": "模版Id",
    "items": [
        {
          "key": "字段名稱",
          "value": "字段值",
          "locations": ["坐標信息"] // 如果有多區(qū)域同名，坐標會有多行，對應多個區(qū)域的坐標
        },
    ]
    "ocrResult": {
        // 通用OCR結(jié)果
    }
  }
}

支持語言

服務配置

錯誤代碼列表

常用語言 Demo

Java 示例

import org.apache.http.Header;
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.*;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.*;

public class IOcrV3Demo {

    private static Logger logger = LoggerFactory.getLogger(OcrV3Demo.class);

    private static final String YOUDAO_URL = "https://openapi.youdao.com/iocr";

    private static final String APP_KEY = "您的應用ID";

    private static final String APP_SECRET = "您的應用密鑰";

    public static void main(String[] args) throws IOException {

        Map<String,String> params = new HashMap<String,String>();
        String q = loadAsBase64("圖片的路徑");
        String salt = String.valueOf(System.currentTimeMillis());
        params.put("q", q);
        params.put("templateId", 模版Id);
        params.put("signType", "v3");
        String curtime = String.valueOf(System.currentTimeMillis() / 1000);
        params.put("curtime", curtime);
        String signStr = APP_KEY + truncate(q) + salt + curtime + APP_SECRET;
        String sign = getDigest(signStr);
        params.put("appKey", APP_KEY);
        params.put("salt", salt);
        params.put("sign", sign);
        String result = requestForHttp(YOUDAO_URL,params);
        /** 處理結(jié)果 */
        System.out.println(result);
    }

    public static String requestForHttp(String url,Map<String,String> params) throws IOException {
        String result = "";

        /** 創(chuàng)建HttpClient */
        CloseableHttpClient httpClient = HttpClients.createDefault();

        /** httpPost */
        HttpPost httpPost = new HttpPost(url);
        List<NameValuePair> paramsList = new ArrayList<NameValuePair>();
        Iterator<Map.Entry<String,String>> it = params.entrySet().iterator();
        while(it.hasNext()){
            Map.Entry<String,String> en = it.next();
            String key = en.getKey();
            String value = en.getValue();
            paramsList.add(new BasicNameValuePair(key,value));
        }
        httpPost.setEntity(new UrlEncodedFormEntity(paramsList,"UTF-8"));
        CloseableHttpResponse httpResponse = httpClient.execute(httpPost);
        try{
            HttpEntity httpEntity = httpResponse.getEntity();
            result = EntityUtils.toString(httpEntity,"UTF-8");
            EntityUtils.consume(httpEntity);
        }finally {
            try{
                if(httpResponse!=null){
                    httpResponse.close();
                }
            }catch(IOException e){
                logger.info("## release resouce error ##" + e);
            }
        }
        return result;
    }

    /**
     * 生成加密字段
     */
    public static String getDigest(String string) {
        if (string == null) {
            return null;
        }
        char hexDigits[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
        byte[] btInput = string.getBytes(StandardCharsets.UTF_8);
        try {
            MessageDigest mdInst = MessageDigest.getInstance("SHA-256");
            mdInst.update(btInput);
            byte[] md = mdInst.digest();
            int j = md.length;
            char str[] = new char[j * 2];
            int k = 0;
            for (byte byte0 : md) {
                str[k++] = hexDigits[byte0 >>> 4 & 0xf];
                str[k++] = hexDigits[byte0 & 0xf];
            }
            return new String(str);
        } catch (NoSuchAlgorithmException e) {
            return null;
        }
    }

    public static String loadAsBase64(String imgFile)
  {//將圖片文件轉(zhuǎn)化為字節(jié)數(shù)組字符串，并對其進行Base64編碼處理

    File file = new File(imgFile);
    if(!file.exists()){
        logger.error("文件不存在");
        return null;
    }
    InputStream in = null;
    byte[] data = null;
      //讀取圖片字節(jié)數(shù)組
    try
    {
        in = new FileInputStream(imgFile);
        data = new byte[in.available()];
        in.read(data);
        in.close();
    }
    catch (IOException e)
    {
        e.printStackTrace();
    }
      //對字節(jié)數(shù)組Base64編碼
    return Base64.getEncoder().encodeToString(data);//返回Base64編碼過的字節(jié)數(shù)組字符串
  }

  public static String truncate(String q) {
        if (q == null) {
            return null;
        }
        int len = q.length();
        String result;
        return len <= 20 ? q : (q.substring(0, 10) + len + q.substring(len - 10, len));
    }
}

Python 示例

# -*- coding: utf-8 -*-
import sys
import uuid
import requests
import base64
import hashlib
import time

reload(sys)
sys.setdefaultencoding('utf-8')

YOUDAO_URL = 'https://openapi.youdao.com/iocr'
APP_KEY = '您的應用ID'
APP_SECRET = '您的應用密鑰'


def truncate(q):
    if q is None:
        return None
    q_utf8 = q.decode("utf-8")
    size = len(q_utf8)
    return q_utf8 if size <= 20 else q_utf8[0:10] + str(size) + q_utf8[size - 10:size]


def encrypt(signStr):
    hash_algorithm = hashlib.sha256()
    hash_algorithm.update(signStr.encode('utf-8'))
    return hash_algorithm.hexdigest()


def do_request(data):
    headers = {'Content-Type': 'application/x-www-form-urlencoded'}
    return requests.post(YOUDAO_URL, data=data, headers=headers)


def connect():
    f = open(r'圖片的路徑', 'rb')  # 二進制方式打開圖文件
    q = base64.b64encode(f.read())  # 讀取文件內(nèi)容，轉(zhuǎn)換為base64編碼
    f.close()

    data = {}
    data['q'] = q
    data['templateId'] = 模版id
    data['signType'] = 'v3'
    curtime = str(int(time.time()))
    data['curtime'] = curtime
    salt = str(uuid.uuid1())
    signStr = APP_KEY + truncate(q) + salt + curtime + APP_SECRET
    sign = encrypt(signStr)
    data['appKey'] = APP_KEY
    data['salt'] = salt
    data['sign'] = sign

    response = do_request(data)
    print response.content


if __name__ == '__main__':
    connect()

C# 示例

using System;
using System.IO;
using System.Net;
using System.Text;
using System.Collections.Generic;
using System.Security.Cryptography;

namespace zhiyun_csharp_demo
{
    class OcrV3Demo
    {
        public static void Main()
        {
            Dictionary dic = new Dictionary();
            string url = "https://openapi.youdao.com/iocr";
            string q = LoadAsBase64("圖片的路徑");
            string appKey = "您的應用ID";
            string appSecret = "您的應用密鑰";
            string salt = DateTime.Now.Millisecond.ToString();
            dic.Add("templateId", 模版Id);
            dic.Add("signType", "v3");
            dic.Add("q", System.Web.HttpUtility.UrlEncode(q));
            TimeSpan ts = (DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc));
            long millis = (long) ts.TotalMilliseconds;
            string curtime = Convert.ToString(millis / 1000);
            dic.Add("curtime", curtime);
            string signStr = appKey + Truncate(q) + salt + curtime + appSecret;;
            string sign = ComputeHash(signStr, new SHA256CryptoServiceProvider());
            dic.Add("appKey", appKey);
            dic.Add("salt", salt);
            dic.Add("sign", sign);
            string result = Post(url, dic);
            Console.WriteLine(result);
        }

        protected static string ComputeHash(string input, HashAlgorithm algorithm)
        {
          Byte[] inputBytes = Encoding.UTF8.GetBytes(input);
          Byte[] hashedBytes = algorithm.ComputeHash(inputBytes);
          return BitConverter.ToString(hashedBytes).Replace("-", "");
        }

        protected static string Truncate(string q)
        {
            if (q == null)
            {
               return null;
            }
            int len = q.Length;
            return len <= 20 ? q : (q.Substring(0, 10) + len + q.Substring(len - 10, 10));
        }

        protected static string LoadAsBase64(string filename)
        {
            try
            {
                FileStream filestream = new FileStream(filename, FileMode.Open);
                byte[] arr = new byte[filestream.Length];
                filestream.Position = 0;
                filestream.Read(arr, 0, (int)filestream.Length);
                filestream.Close();
                return Convert.ToBase64String(arr);
            }
            catch (Exception ex)
            {
                return null;
            }
        }

        protected static string Post(string url, Dictionary dic)
        {
            string result = "";
            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
            req.Method = "POST";
            req.ContentType = "application/x-www-form-urlencoded";
            StringBuilder builder = new StringBuilder();
            int i = 0;
            foreach (var item in dic)
            {
                if (i > 0)
                    builder.Append("&");
                builder.AppendFormat("{0}={1}", item.Key, item.Value);
                i++;
            }
            byte[] data = Encoding.UTF8.GetBytes(builder.ToString());
            req.ContentLength = data.Length;
            using (Stream reqStream = req.GetRequestStream())
            {
                reqStream.Write(data, 0, data.Length);
                reqStream.Close();
            }
            HttpWebResponse resp = (HttpWebResponse)req.GetResponse();
            Stream stream = resp.GetResponseStream();
            using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
            {
                result = reader.ReadToEnd();
            }
            return result;
        }
    }
}

PHP 示例

<?php
define("CURL_TIMEOUT",   2000);
define("URL",            "https://openapi.youdao.com/iocr");
define("APP_KEY",        "您的應用ID"); // 替換為您的應用ID
define("SEC_KEY",        "您的應用密鑰"); // 替換為您的密鑰

function do_request($q)
{
     $salt = create_guid();
     $args = array(
        'appKey' => APP_KEY,
        'salt' => $salt,
     );
     $args['q'] = $q;
     $args['templateId'] = 模版Id;
     $args['signType'] = 'v3';
     $curtime = strtotime("now");
     $args['curtime'] = $curtime;
     $signStr = APP_KEY . truncate($q) . $salt . $curtime . SEC_KEY;
     $args['sign'] = hash("sha256", $signStr);
     $ret = call(URL, $args);
     print_r($ret);
     $ret = json_decode($ret, true);
     return $ret;
}

// 發(fā)起網(wǎng)絡請求
function call($url, $args=null, $method="post", $testflag = 0, $timeout = CURL_TIMEOUT, $headers=array())
{
    $ret = false;
    $i = 0;
    while($ret === false)
    {
        if($i > 1)
            break;
        if($i > 0)
        {
            sleep(1);
        }
         $ret = callOnce($url, $args, $method, false, $timeout, $headers);
         $i++;
    }
    return $ret;
}

function callOnce($url, $args=null, $method="post", $withCookie = false, $timeout = CURL_TIMEOUT, $headers=array())
{
    $ch = curl_init();
    if($method == "post")
    {
        $data = convert($args);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
        curl_setopt($ch, CURLOPT_POST, 1);
    }
    else
    {
        $data = convert($args);
        if($data)
        {
            if(stripos($url, "?") > 0)
            {
                 $url .= "&$data";
            }
            else
            {
                 $url .= "?$data";
            }
        }
    }
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    if(!empty($headers))
    {
        curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
    }
    if($withCookie)
    {
        curl_setopt($ch, CURLOPT_COOKIEJAR, $_COOKIE);
    }
    $r = curl_exec($ch);
    curl_close($ch);
    return $r;
}

function convert(&$args)
{
    $data = '';
    if (is_array($args))
    {
        foreach ($args as $key=>$val)
        {
            if (is_array($val))
            {
                foreach ($val as $k=>$v)
                {
                     $data .= $key.'['.$k.']='.rawurlencode($v).'&';
                }
            }
            else
            {
                     $data .="$key=".rawurlencode($val)."&";
            }
        }
        return trim($data, "&");
    }
    return $args;
}

// uuid generator
function create_guid(){
    $microTime = microtime();
    list($a_dec, $a_sec) = explode(" ", $microTime);
    $dec_hex = dechex($a_dec* 1000000);
    $sec_hex = dechex($a_sec);
    ensure_length($dec_hex, 5);
    ensure_length($sec_hex, 6);
    $guid = "";
    $guid .= $dec_hex;
    $guid .= create_guid_section(3);
    $guid .= '-';
    $guid .= create_guid_section(4);
    $guid .= '-';
    $guid .= create_guid_section(4);
    $guid .= '-';
    $guid .= create_guid_section(4);
    $guid .= '-';
    $guid .= $sec_hex;
    $guid .= create_guid_section(6);
    return $guid;
}

function truncate($q) {
    $len = abslength($q);
    return $len <= 20 ? $q : (mb_substr($q, 0, 10) . $len . mb_substr($q, $len - 10, $len));
}

function abslength($str)
{
    if(empty($str)){
        return 0;
    }
    if(function_exists('mb_strlen')){
        return mb_strlen($str,'utf-8');
    }
    else {
        preg_match_all("/./u", $str, $ar);
        return count($ar[0]);
    }
}

function ensure_length(&$string, $length){
    $strlen = strlen($string);
    if($strlen < $length)
    {
         $string = str_pad($string, $length, "0");
    }
    else if($strlen > $length)
    {
         $string = substr($string, 0, $length);
    }
}

function create_guid_section($characters){
    $return = "";
    for($i = 0; $i < $characters; $i++)
    {
         $return .= dechex(mt_rand(0,15));
    }
    return $return;
}
// 輸入
$file = "圖片的路徑";
$fp = fopen($file, "r") or die("Can't open file");
// base64編碼
$q = base64_encode(fread($fp, filesize($file)));
fclose($fp);
do_request($q);
?>

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