OCR識別

時間 2019-11-08

標籤 ocr 識別简体版

原文原文鏈接

最近做者項目中用到了身份證識別跟營業執照的OCR識別，就研究了一下百度雲跟騰訊雲的OCR產品接口。html

1.騰訊雲OCR前端

收費：身份證OCR和營業執照OCR接口，每一個接口每一個月各有1000次的免費調用java

接口說明：json

身份證OCR接口 - 後端

https://cloud.tencent.com/document/product/866/33524api
營業執照OCR接口-數組

https://cloud.tencent.com/document/product/866/17598app

身份證-OCR接入dom

引入騰訊的SDK及JSONide

<dependency>
        <groupId>com.tencentcloudapi</groupId>
        <artifactId>tencentcloud-sdk-java</artifactId>
        <version>3.0.58</version>
    </dependency>     
    <dependency>
            <groupId>net.sf.json-lib</groupId>
            <artifactId>json-lib</artifactId>
            <version>2.4</version>
            <classifier>jdk15</classifier>
        </dependency>

　　2.前端html代碼

<form action="/ocr/uploadFile" method="POST" enctype="multipart/form-data">
    <input type="file" name="file">
    <br />
    <input type="radio" name="card_side" value="FRONT"> 正面 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
    <input type="radio" name="card_side" value="BACK"> 反面
    <br />
    <input type="submit" value="提交">
    
  </form>

　　3.後端代碼

@PostMapping("uploadFile")
  @ResponseBody
  public IDCardOCRResponse OCRIdCardTest(@RequestParam(value = "file") MultipartFile file,@RequestParam(value = "card_side") String cardSize,Model model){
    try {
      Credential cred = new Credential("AKIDGQfhYTqEs0DMvUQH93wXKsIX", "7adThzEEH6mK6zg9MMwX0");
          
          HttpProfile httpProfile = new HttpProfile();
          httpProfile.setEndpoint("ocr.tencentcloudapi.com");

          ClientProfile clientProfile = new ClientProfile();
          clientProfile.setHttpProfile(httpProfile);            
          
          OcrClient client = new OcrClient(cred, "ap-beijing", clientProfile);
          Map<String, String> params = new HashMap<>();
          params.put("ImageBase64", getBase64FromInputStream(file.getInputStream()));
          params.put("CardSide", cardSize);

          System.out.println(getBase64FromInputStream(file.getInputStream()));
          IDCardOCRRequest req = IDCardOCRRequest.fromJsonString(JSONObject.fromObject(params).toString(), IDCardOCRRequest.class);
          IDCardOCRResponse resp = client.IDCardOCR(req);
          return resp;
    } catch (Exception e) {
      // TODO: handle exception
      e.printStackTrace();
    }
    return null;
    
  }

說明：new Credential("secretId","secretKey"),這兩個參數在騰訊雲控制檯申請

　　4.getBase64FromInputStream代碼，把MultipartFile 轉爲base64

public static String getBase64FromInputStream(InputStream in) {
          // 將圖片文件轉化爲字節數組字符串，並對其進行Base64編碼處理
          byte[] data = null;
          // 讀取圖片字節數組
          try {
              ByteArrayOutputStream swapStream = new ByteArrayOutputStream();
              byte[] buff = new byte[100];
              int rc = 0;
              while ((rc = in.read(buff, 0, 100)) > 0) {
                  swapStream.write(buff, 0, rc);
              }
              data = swapStream.toByteArray();
          } catch (IOException e) {
              e.printStackTrace();
          } finally {
              if (in != null) {
                  try {
                      in.close();
                  } catch (IOException e) {
                      e.printStackTrace();
                  }
              }
          }
          return new String(Base64.encodeBase64(data));
      }

運行前端html碼，選擇身份證圖片，點擊提交就能夠返回身份證的信息了。

營業執照-OCR

1.前端html代碼

<form action="/ocr/bizlicense" method="POST" enctype="multipart/form-data">
    <input type="file" name="file">
    <br />
    
    <input type="submit" value="提交">
    
  </form>

2.後端代碼

@PostMapping("bizlicense")
  @ResponseBody
  public String OCRBizlicenseTest(@RequestParam(value = "file") MultipartFile file) throws Exception{
      RestTemplate restTemplate = new RestTemplate();
    String apiUrl="https://recognition.image.myqcloud.com/ocr/bizlicense";
    HttpHeaders headers = new HttpHeaders();
        headers.set("host", "recognition.image.myqcloud.com");
        headers.set("content-type", "application/json");
        String authorization=QQOCRSignUtils.appSign(XXXX, "AKIDGQfhYTqEs0DXXX", "7adThzEEH6mKXXX", "", 10L);
        headers.set("authorization",authorization );
       
        JSONObject params = new JSONObject();
        params.put("appid", "XXX");
        params.put("image", getBase64FromInputStream(file.getInputStream()));
        HttpEntity<JSONObject> entity = new HttpEntity<JSONObject>(params, headers);
        HttpEntity<String> response  = restTemplate.postForEntity(apiUrl, entity, String.class);
        return response.getBody();
  }

3.QQOCRSignUtils.appSign

/**
     * 生成 Authorization 簽名字段
     * 
     * @param appId
     * @param secretId
     * @param secretKey
     * @param bucketName
     * @param expired
     * @return
     * @throws Exception
     */
    public static String appSign(long appId, String secretId, String secretKey, String bucketName,
            long expired) throws Exception {
        long now = System.currentTimeMillis() / 1000;
        int rdm = Math.abs(new Random().nextInt());
        String plainText = String.format("a=%d&b=%s&k=%s&t=%d&e=%d&r=%d", appId, bucketName,
                secretId, now, now + expired, rdm);
        byte[] hmacDigest = HmacSha1(plainText, secretKey);
        byte[] signContent = new byte[hmacDigest.length + plainText.getBytes().length];
        System.arraycopy(hmacDigest, 0, signContent, 0, hmacDigest.length);
        System.arraycopy(plainText.getBytes(), 0, signContent, hmacDigest.length,
                plainText.getBytes().length);
        return Base64Encode(signContent);
    }

運行前端html碼，選擇營業執照圖片，點擊提交就能夠返回營業執照的信息了。

2.百度OCR

經過如下步驟建立OCR應用，做者當時在這一步花了很長時間

建立完以後就能夠拿到appId，API Key，Secret Key，就能夠調用百度提供的api了

收費：身份證OCR和營業執照OCR接口，每一個接口天天各有500次的免費調用

接口說明：

身份證OCR接口 -

https://cloud.baidu.com/doc/OCR/OCR-API.html#.E8.BA.AB.E4.BB.BD.E8.AF.81.E8.AF.86.E5.88.AB
營業執照OCR接口-

https://cloud.baidu.com/doc/OCR/OCR-API.html#.E8.90.A5.E4.B8.9A.E6.89.A7.E7.85.A7.E8.AF.86.E5.88.AB

身份證OCR

只列出後端的代碼，前端代碼跟騰訊的同樣，只不過先後面身份證枚舉值不同，參考接口文檔說明。

@PostMapping("ocridcard")
  @ResponseBody
  public String OCRIdCardTest(@RequestParam(value = "file") MultipartFile file,@RequestParam(value = "card_side") String cardSize,Model model){
    try {
      RestTemplate restTemplate = new RestTemplate();
      HttpEntity<String> response =  restTemplate.postForEntity("https://aip.baidubce.com/oauth/2.0/token?grant_type=client_credentials&client_id=XXXXXX&client_secret=XXXXXX",null,String.class);
      JSONObject jsonObject = JSONObject.fromObject(response.getBody());
      System.out.println(response.getBody());
      String accessToken = jsonObject.getString("access_token");
      
      String apiUrl="https://aip.baidubce.com/rest/2.0/ocr/v1/idcard?access_token="+accessToken;
      HttpHeaders headers = new HttpHeaders();
          headers.set("content-type", "application/x-www-form-urlencoded");
          
          MultiValueMap<String, Object> params = new LinkedMultiValueMap<>();
          params.add("detect_direction", "true");
          params.add("id_card_side", cardSize);
          params.add("image", Base64Utils.getBase64FromInputStream(file.getInputStream()));
          params.add("detect_risk", "true");
          System.out.println(Base64Utils.getBase64FromInputStream(file.getInputStream()));
          System.out.println(URLDecoder.decode(URLEncoder.encode(Base64Utils.getBase64FromInputStream(file.getInputStream()),"UTF-8"),"UTF-8"));
          HttpEntity<MultiValueMap<String, Object>> entity = new HttpEntity<>(params, headers);
          response  = restTemplate.postForEntity(apiUrl, entity, String.class);
          return response.getBody();
          
    } catch (Exception e) {
      // TODO: handle exception
      e.printStackTrace();
    }
    return null;
    
  }

營業執照OCR

@PostMapping("ocrbusinesslicense")
  @ResponseBody
  public String OCRBusinessLicenseTest(@RequestParam(value = "file") MultipartFile file,Model model){
    try {
      RestTemplate restTemplate = new RestTemplate();
      HttpEntity<String> response =  restTemplate.postForEntity("https://aip.baidubce.com/oauth/2.0/token?grant_type=client_credentials&client_id=XXXXX&client_secret=XXXXXX",null,String.class);
      JSONObject jsonObject = JSONObject.fromObject(response.getBody());
      System.out.println(response.getBody());
      String accessToken = jsonObject.getString("access_token");
      
      String apiUrl="https://aip.baidubce.com/rest/2.0/ocr/v1/business_license?access_token="+accessToken;
      HttpHeaders headers = new HttpHeaders();
          headers.set("content-type", "application/x-www-form-urlencoded");
          
          MultiValueMap<String, Object> params = new LinkedMultiValueMap<>();
          params.add("detect_direction", "true");
          params.add("image", Base64Utils.getBase64FromInputStream(file.getInputStream()));
     
          System.out.println(Base64Utils.getBase64FromInputStream(file.getInputStream()));
          System.out.println(URLDecoder.decode(URLEncoder.encode(Base64Utils.getBase64FromInputStream(file.getInputStream()),"UTF-8"),"UTF-8"));
          HttpEntity<MultiValueMap<String, Object>> entity = new HttpEntity<>(params, headers);
          response  = restTemplate.postForEntity(apiUrl, entity, String.class);
          return response.getBody();
          
    } catch (Exception e) {
      // TODO: handle exception
      e.printStackTrace();
    }
    return null;
    
  }

做者： Eric.Chen
出處： https://www.cnblogs.com/lc-chenlong
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