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更新时间:2024-06-19 GMT+08:00
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自定义模板OCR

功能介绍

自定义模板OCR,支持用户自定义模板,对于版式固定的各种票据和卡证,通过可视化界面操作,指定需要识别的关键字段,实现用户特定格式图片的自动识别和结构化提取。

约束与限制

  • 只支持识别PNG、JPG、PNG、BMP、TIFF、GIF、WEBP格式图片。
  • 图像各边的像素大小在100px到8000px之间。
  • 图像中识别区域有效占比超过80%,保证整张表格及其边缘包含在图像内。
  • 支持图像任意角度的水平旋转。
  • 目前不支持复杂背景(如户外自然场景、防伪水印等)和表格线扭曲图像的文字识别。
  • 支持中英文以及部分繁体字。
  • API支持识别的图片版式依赖于创建自定义OCR工作流时的类型。

调用方法

请参见如何调用API

前提条件

在使用之前,你需要通过OCR控制台,完成自定义OCR工作流的开发。开发、部署完成后,将在工作流的部署页面生成API的URI。

自定义OCR工作流开发过程,可参考自定义OCR介绍

URI

POST /v2/{project_id}/ocr/custom-template

表1 路径参数

参数

是否必选

说明

endpoint

终端节点,即调用API的请求地址。

不同服务不同区域的endpoint不同,您可以从终端节点中获取。

例如,OCR服务在“华北-北京四”区域的“endpoint”“ocr.cn-north-4.myhuaweicloud.com”

project_id

项目ID,您可以从获取项目ID中获取。

请求参数

表2 请求Header参数

参数

是否必选

参数类型

描述

X-Auth-Token

String

用户Token。

用于获取操作API的权限。获取Token接口响应消息头中X-Subject-Token的值即为Token。

Content-Type

String

发送的实体的MIME类型,参数值为“application/json”。

Enterprise-Project-Id

String

企业项目ID。OCR支持通过企业项目管理(EPS)对不同用户组和用户的资源使用,进行分账。

获取方法:进入“企业项目管理”页面,单击企业项目名称,在企业项目详情页获取Enterprise-Project-Id(企业项目ID)。

企业项目创建步骤请参见用户指南。

说明:

创建企业项目后,在传参时,有以下三类场景。

  • 携带正确的ID,正常使用OCR服务,账单的企业项目会被分类到企业ID对应的企业项目中。
  • 携带格式正确但不存在的ID,正常使用OCR服务,账单的企业项目会显示对应不存在的企业项目ID。
  • 不携带ID或格式错误ID(包含特殊字符等),正常使用OCR服务,账单的企业项目会被分类到"default"中。
表3 请求Body参数

参数

是否必选

参数类型

描述

image

String

与url二选一

图像数据,base64编码,要求base64编码后大小不超过10MB。图片最小边不小于15px,最长边不超过8192px,支持JPEG、JPG、PNG、BMP、TIFF、GIF、WEBP格式。

图片文件Base64编码字符串,单击这里查看详细获取方式。

url

String

与image二选一 图片的URL路径,目前支持:

  • 公网http/https url
  • OBS提供的url,使用OBS数据需要进行授权。包括对服务授权、临时授权、匿名公开授权,详情参见配置OBS访问权限
说明:
  • 接口响应时间依赖于图片的下载时间,如果图片下载时间过长,会返回接口调用失败。
  • 请保证被检测图片所在的存储服务稳定可靠,推荐使用OBS服务存储图片数据。

template_id

String

该参数与classifier_id二选一。 模型id,如果传入,启用单模板识别模式。

classifier_id

String

该参数与template_id二选一。 分类器id,如果传入,启用多模板识别模式。

classifier_mode

Boolean

该参数与classifier_id参数配合使用,可选值如下所示:

  • true:仅返回模板分类结果
  • false:正常返回多模板识别结果
说明:

如果未传入该参数时默认为false,即正常返回多模板识别结果。

响应参数

状态码: 200

表4 响应Body参数

参数

参数类型

描述

result

Object

调用成功时表示调用结果。

调用失败时无此字段。

template_id

String

调用成功时返回调用模板id。

调用失败时无此字段。

状态码: 400

表5 响应Body参数

参数

参数类型

描述

error_code

String

调用失败时的错误码,具体请参见错误码

调用成功时无此字段。

error_msg

String

调用失败时的错误信息。

调用成功时无此字段。

请求示例

  • “endpoint”即调用API的请求地址,不同服务不同区域的“endpoint”不同,具体请参见终端节点

    例如,自定义模板OCR部署在“华北-北京四”区域的“endpoint”“ocr.cn-north-4.myhuaweicloud.com”“ocr.cn-north-4.myhuaweicloud.cn”,请求URL为“https://ocr.cn-north-4.myhuaweicloud.com/v2/{project_id}/ocr/custom-template”“project_id”为项目ID,获取方法请参见获取项目ID

  • 如何获取Token请参见认证鉴权
  • 传入自定义模板OCR的图片的base64编码进行文字识别
    POST https://{endpoint}/v2/{project_id}/ocr/custom-template
    Request Header:
    Content-Type: application/json
    X-Auth-Token: MIINRwYJKoZIhvcNAQcCoIINODCCDTQCAQExDTALBglghkgBZQMEAgEwgguVBgkqhkiG...
    Request Body:
    {
      "image" : "/9j/4AAQSkZJRgABAgEASABIAAD/4RFZRXhpZgAATU0AKgAAAA...",
      "classifier_id" : "3bed12e0-7c1e-11ed-9bdb-0255ac10009d",
      "classifier_mode" : true
    }
  • 传入自定义模板OCR的图片的url进行文字识别
    POST https://{endpoint}/v2/{project_id}/ocr/custom-template
    Request Header:
    Content-Type: application/json
    X-Auth-Token: MIINRwYJKoZIhvcNAQcCoIINODCCDTQCAQExDTALBglghkgBZQMEAgEwgguVBgkqhkiG...
    Request Body:
    {
      "url" : "https://BucketName.obs.myhuaweicloud.com/ObjectName",
      "classifier_id" : "3bed12e0-7c1e-11ed-9bdb-0255ac10009d",
      "classifier_mode" : true
    }

响应示例

状态码: 200

成功响应示例

{
  "result" : {
    "template_id" : "43580526-658f-11ed-863a-0242ac11000b",
    "template_name" : "3",
    "confidence" : 0.4057
  },
  "template_id" : "43580526-658f-11ed-863a-0242ac11000b"
}

状态码: 400

失败响应示例

{
  "error_code" : "AIS.0103",
  "error_msg" : "The image size does not meet the requirements."
}

SDK代码示例

SDK代码示例如下。

使用SDK前建议将SDK更新至最新版,防止本地旧版SDK无法使用最新的OCR功能。

  • 传入自定义模板OCR的图片的base64编码进行文字识别
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    package com.huaweicloud.sdk.test;
    
    import com.huaweicloud.sdk.core.auth.ICredential;
    import com.huaweicloud.sdk.core.auth.BasicCredentials;
    import com.huaweicloud.sdk.core.exception.ConnectionException;
    import com.huaweicloud.sdk.core.exception.RequestTimeoutException;
    import com.huaweicloud.sdk.core.exception.ServiceResponseException;
    import com.huaweicloud.sdk.ocr.v1.region.OcrRegion;
    import com.huaweicloud.sdk.ocr.v1.*;
    import com.huaweicloud.sdk.ocr.v1.model.*;
    
    
    public class RecognizeCustomTemplateSolution {
    
        public static void main(String[] args) {
            // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
            // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
            String ak = System.getenv("CLOUD_SDK_AK");
            String sk = System.getenv("CLOUD_SDK_SK");
    
            ICredential auth = new BasicCredentials()
                    .withAk(ak)
                    .withSk(sk);
    
            OcrClient client = OcrClient.newBuilder()
                    .withCredential(auth)
                    .withRegion(OcrRegion.valueOf("<YOUR REGION>"))
                    .build();
            RecognizeCustomTemplateRequest request = new RecognizeCustomTemplateRequest();
            CustomTemplateRequestBody body = new CustomTemplateRequestBody();
            body.withClassifierMode(true);
            body.withClassifierId("3bed12e0-7c1e-11ed-9bdb-0255ac10009d");
            body.withImage("/9j/4AAQSkZJRgABAgEASABIAAD/4RFZRXhpZgAATU0AKgAAAA...");
            request.withBody(body);
            try {
                RecognizeCustomTemplateResponse response = client.recognizeCustomTemplate(request);
                System.out.println(response.toString());
            } catch (ConnectionException e) {
                e.printStackTrace();
            } catch (RequestTimeoutException e) {
                e.printStackTrace();
            } catch (ServiceResponseException e) {
                e.printStackTrace();
                System.out.println(e.getHttpStatusCode());
                System.out.println(e.getRequestId());
                System.out.println(e.getErrorCode());
                System.out.println(e.getErrorMsg());
            }
        }
    }
    
  • 传入自定义模板OCR的图片的url进行文字识别
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    package com.huaweicloud.sdk.test;
    
    import com.huaweicloud.sdk.core.auth.ICredential;
    import com.huaweicloud.sdk.core.auth.BasicCredentials;
    import com.huaweicloud.sdk.core.exception.ConnectionException;
    import com.huaweicloud.sdk.core.exception.RequestTimeoutException;
    import com.huaweicloud.sdk.core.exception.ServiceResponseException;
    import com.huaweicloud.sdk.ocr.v1.region.OcrRegion;
    import com.huaweicloud.sdk.ocr.v1.*;
    import com.huaweicloud.sdk.ocr.v1.model.*;
    
    
    public class RecognizeCustomTemplateSolution {
    
        public static void main(String[] args) {
            // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
            // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
            String ak = System.getenv("CLOUD_SDK_AK");
            String sk = System.getenv("CLOUD_SDK_SK");
    
            ICredential auth = new BasicCredentials()
                    .withAk(ak)
                    .withSk(sk);
    
            OcrClient client = OcrClient.newBuilder()
                    .withCredential(auth)
                    .withRegion(OcrRegion.valueOf("<YOUR REGION>"))
                    .build();
            RecognizeCustomTemplateRequest request = new RecognizeCustomTemplateRequest();
            CustomTemplateRequestBody body = new CustomTemplateRequestBody();
            body.withClassifierMode(true);
            body.withClassifierId("3bed12e0-7c1e-11ed-9bdb-0255ac10009d");
            body.withUrl("https://BucketName.obs.myhuaweicloud.com/ObjectName");
            request.withBody(body);
            try {
                RecognizeCustomTemplateResponse response = client.recognizeCustomTemplate(request);
                System.out.println(response.toString());
            } catch (ConnectionException e) {
                e.printStackTrace();
            } catch (RequestTimeoutException e) {
                e.printStackTrace();
            } catch (ServiceResponseException e) {
                e.printStackTrace();
                System.out.println(e.getHttpStatusCode());
                System.out.println(e.getRequestId());
                System.out.println(e.getErrorCode());
                System.out.println(e.getErrorMsg());
            }
        }
    }
    
  • 传入自定义模板OCR的图片的base64编码进行文字识别
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    # coding: utf-8
    
    from huaweicloudsdkcore.auth.credentials import BasicCredentials
    from huaweicloudsdkocr.v1.region.ocr_region import OcrRegion
    from huaweicloudsdkcore.exceptions import exceptions
    from huaweicloudsdkocr.v1 import *
    
    if __name__ == "__main__":
        # The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
        # In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
        ak = os.getenv("CLOUD_SDK_AK")
        sk = os.getenv("CLOUD_SDK_SK")
    
        credentials = BasicCredentials(ak, sk) \
    
        client = OcrClient.new_builder() \
            .with_credentials(credentials) \
            .with_region(OcrRegion.value_of("<YOUR REGION>")) \
            .build()
    
        try:
            request = RecognizeCustomTemplateRequest()
            request.body = CustomTemplateRequestBody(
                classifier_mode=True,
                classifier_id="3bed12e0-7c1e-11ed-9bdb-0255ac10009d",
                image="/9j/4AAQSkZJRgABAgEASABIAAD/4RFZRXhpZgAATU0AKgAAAA..."
            )
            response = client.recognize_custom_template(request)
            print(response)
        except exceptions.ClientRequestException as e:
            print(e.status_code)
            print(e.request_id)
            print(e.error_code)
            print(e.error_msg)
    
  • 传入自定义模板OCR的图片的url进行文字识别
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    # coding: utf-8
    
    from huaweicloudsdkcore.auth.credentials import BasicCredentials
    from huaweicloudsdkocr.v1.region.ocr_region import OcrRegion
    from huaweicloudsdkcore.exceptions import exceptions
    from huaweicloudsdkocr.v1 import *
    
    if __name__ == "__main__":
        # The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
        # In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
        ak = os.getenv("CLOUD_SDK_AK")
        sk = os.getenv("CLOUD_SDK_SK")
    
        credentials = BasicCredentials(ak, sk) \
    
        client = OcrClient.new_builder() \
            .with_credentials(credentials) \
            .with_region(OcrRegion.value_of("<YOUR REGION>")) \
            .build()
    
        try:
            request = RecognizeCustomTemplateRequest()
            request.body = CustomTemplateRequestBody(
                classifier_mode=True,
                classifier_id="3bed12e0-7c1e-11ed-9bdb-0255ac10009d",
                url="https://BucketName.obs.myhuaweicloud.com/ObjectName"
            )
            response = client.recognize_custom_template(request)
            print(response)
        except exceptions.ClientRequestException as e:
            print(e.status_code)
            print(e.request_id)
            print(e.error_code)
            print(e.error_msg)
    
  • 传入自定义模板OCR的图片的base64编码进行文字识别
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    package main
    
    import (
    	"fmt"
    	"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
        ocr "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/ocr/v1"
    	"github.com/huaweicloud/huaweicloud-sdk-go-v3/services/ocr/v1/model"
        region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/ocr/v1/region"
    )
    
    func main() {
        // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
        // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
        ak := os.Getenv("CLOUD_SDK_AK")
        sk := os.Getenv("CLOUD_SDK_SK")
    
        auth := basic.NewCredentialsBuilder().
            WithAk(ak).
            WithSk(sk).
            Build()
    
        client := ocr.NewOcrClient(
            ocr.OcrClientBuilder().
                WithRegion(region.ValueOf("<YOUR REGION>")).
                WithCredential(auth).
                Build())
    
        request := &model.RecognizeCustomTemplateRequest{}
    	classifierModeCustomTemplateRequestBody:= true
    	classifierIdCustomTemplateRequestBody:= "3bed12e0-7c1e-11ed-9bdb-0255ac10009d"
    	imageCustomTemplateRequestBody:= "/9j/4AAQSkZJRgABAgEASABIAAD/4RFZRXhpZgAATU0AKgAAAA..."
    	request.Body = &model.CustomTemplateRequestBody{
    		ClassifierMode: &classifierModeCustomTemplateRequestBody,
    		ClassifierId: &classifierIdCustomTemplateRequestBody,
    		Image: &imageCustomTemplateRequestBody,
    	}
    	response, err := client.RecognizeCustomTemplate(request)
    	if err == nil {
            fmt.Printf("%+v\n", response)
        } else {
            fmt.Println(err)
        }
    }
    
  • 传入自定义模板OCR的图片的url进行文字识别
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    package main
    
    import (
    	"fmt"
    	"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
        ocr "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/ocr/v1"
    	"github.com/huaweicloud/huaweicloud-sdk-go-v3/services/ocr/v1/model"
        region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/ocr/v1/region"
    )
    
    func main() {
        // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
        // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
        ak := os.Getenv("CLOUD_SDK_AK")
        sk := os.Getenv("CLOUD_SDK_SK")
    
        auth := basic.NewCredentialsBuilder().
            WithAk(ak).
            WithSk(sk).
            Build()
    
        client := ocr.NewOcrClient(
            ocr.OcrClientBuilder().
                WithRegion(region.ValueOf("<YOUR REGION>")).
                WithCredential(auth).
                Build())
    
        request := &model.RecognizeCustomTemplateRequest{}
    	classifierModeCustomTemplateRequestBody:= true
    	classifierIdCustomTemplateRequestBody:= "3bed12e0-7c1e-11ed-9bdb-0255ac10009d"
    	urlCustomTemplateRequestBody:= "https://BucketName.obs.myhuaweicloud.com/ObjectName"
    	request.Body = &model.CustomTemplateRequestBody{
    		ClassifierMode: &classifierModeCustomTemplateRequestBody,
    		ClassifierId: &classifierIdCustomTemplateRequestBody,
    		Url: &urlCustomTemplateRequestBody,
    	}
    	response, err := client.RecognizeCustomTemplate(request)
    	if err == nil {
            fmt.Printf("%+v\n", response)
        } else {
            fmt.Println(err)
        }
    }
    

更多编程语言的SDK代码示例,请参见API Explorer的代码示例页签,可生成自动对应的SDK代码示例。

状态码

状态码

描述

200

成功响应示例

400

失败响应示例

状态码请参见状态码

错误码

错误码请参见错误码

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