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更新时间:2024-06-19 GMT+08:00
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车辆合格证识别

功能介绍

识别车辆合格证中的文字信息,并返回识别的结构化结果。

约束与限制

  • 只支持中国大陆车辆合格证的识别。
  • 只支持识别PNG、JPG、JPEG、BMP、TIFF格式的图片。
  • 图像各边的像素大小在15到8192px之间。
  • 图像中识别区域有效占比超过80%,保证整张车辆合格证内容及其边缘包含在图像内。
  • 支持图像中车辆合格证任意角度的水平旋转。
  • 支持少量扭曲,扭曲后图像中的车辆合格证长宽比与实际驾驶证相差不超过10%。
  • 能处理暗光等干扰的图片但影响识别精度。
  • 文字识别服务属于公有云服务,线上用户资源共享,如果需要多并发请求,请提前联系我们

调用方法

请参见如何调用API

前提条件

在使用之前,需要您完成服务申请和认证鉴权,具体操作流程请参见开通服务认证鉴权章节。

用户首次使用需要先申请开通。服务只需要开通一次即可,后面使用时无需再次申请。如未开通服务,调用服务时会提示ModelArts.4204报错,请在调用服务前先进入控制台开通服务,并注意开通服务区域与调用服务的区域保持一致。

URI

POST /v2/{project_id}/ocr/vehicle-certificate

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。

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10M。

图片最小边不小于15像素,最长边不超过8192像素。支持JPG/PNG/BMP/TIFF格式。

图片Base64编码示例如/9j/4AAQSkZJRgABAg...,带有多余前缀会产生The image format is not supported报错。

url

String

与image二选一。

图片的URL路径,目前仅支持华为云上OBS提供的匿名公开授权访问的URL以及公网URL。

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。

return_text_location

Boolean

识别到的文字块的区域位置信息。可选值包括:

  • true:返回各个文字块区域
  • false:不返回各个文字块区域

如果无该参数,系统默认不返回文字块区域。如果输入参数不是Boolean类型,则会报非法参数错误。

响应参数

状态码: 200

表4 响应Body参数

参数

参数类型

描述

result

VehicleCertificateResult object

调用成功时表示调用结果。

调用失败时无此字段。

表5 VehicleCertificateResult

参数

参数类型

描述

certificate_number

String

合格证编号。

issue_date

String

发证日期。

manufacture_name

String

车辆制造企业名称。

vehicle_brand

String

车辆品牌。

vehicle_name

String

车辆名称。

vehicle_model

String

车辆型号。

vin

String

车架号。

vehicle_color

String

车身颜色。

chassis_model

String

底盘型号。

chassis_id

String

底盘ID。

chassis_certificate_number

String

底盘合格证编号。

engine_model

String

发动机型号。

engine_number

String

发动机号。

fuel_type

String

燃料种类。

displacement

String

排量。

power

String

功率。

emission_standard

String

排放标准。

fuel_consumption

String

油耗。

overall_dimension_length

String

外廓尺寸-长。

overall_dimension_width

String

外廓尺寸-宽。

overall_dimension_height

String

外廓尺寸-高。

container_dimension_length

String

货厢内部尺寸-长。

container_dimension_width

String

货厢内部尺寸-宽。

container_dimension_height

String

货厢内部尺寸-高。

spring_quantity

String

钢板弹簧片数。

tire_quantity

String

轮胎数。

tire_size

String

轮胎规格。

front_wheel_track

String

轮距-前。

rear_wheel_track

String

轮距-后。

wheelbase

String

轴距。

axle_load

String

轴荷。

axle_quantity

String

轴数。

steering_form

String

转向形式。

total_weight

String

总质量。

equipment_weight

String

整备质量。

maximum_laden_mass

String

额定载质量。

mass_utilization_coefficient

String

载质量利用系数。

traction_weight

String

准牵引总质量。

maximum_load_mass

String

半挂车鞍座最大允许总质量。

cab_passenger_capacity

String

驾驶室准乘人数。

passenger_capacity

String

额定载客。

max_design_speed

String

最高设计车速。

manufacture_date

String

车辆制造日期。

confidence

Object

字段的置信度,取值范围0~1。 置信度越大,本次识别的字段的可靠性越高,在统计意义上,置信度越大,准确率越高。 置信度由算法给出,不直接等价于字段的准确率。

text_location

Object

对应所有在原图上识别到的字段位置信息,包含所有文字区域四个顶点的二维坐标(x,y)。采用图像坐标系,坐标原点为图片左上角,x轴沿水平方向,y轴沿竖直方向。

状态码: 400

表6 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

调用成功时不返回此字段。

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,车辆合格证识别服务部署在“华北-北京四”区域的“endpoint”为“ocr.cn-north-4.myhuaweicloud.com”,请求URL为“https://ocr.cn-north-4.myhuaweicloud.com/v2/{project_id}/ocr/vehicle-certificate”,“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
  • 传入车辆合格证图片的base64编码进行文字识别
    POST https://{endpoint}/v2/{project_id}/ocr/vehicle-certificate
    
    {
      "image" : "/9j/4AAQSkZJRgABAgEASABIAAD/4RFZRXhpZgAATU0AKgAAAA..."
    }
  • 传入车辆合格证图片的url进行文字识别
    POST https://{endpoint}/v2/{project_id}/ocr/vehicle-certificate
    
    {
      "url" : "https://BucketName.obs.myhuaweicloud.com/ObjectName"
    }

响应示例

状态码: 200

成功响应示例

{
  "result" : {
    "certificate_number" : "WAS1xxxx2399503",
    "issue_date" : "2022年10月23日",
    "manufacture_name" : "xxxx汽车有限公司",
    "vehicle_brand" : "xxx牌/xxx",
    "vehicle_name" : "轿车",
    "vehicle_model" : "TV7xxxxx",
    "vin" : "LFMAYxxxxxxx92063",
    "vehicle_color" : "白",
    "chassis_model" : "x",
    "chassis_id" : "x",
    "chassis_certificate_number" : "x",
    "engine_model" : "9NR",
    "engine_number" : "A2853xx",
    "fuel_type" : "汽油",
    "displacement" : "x197",
    "power" : "xx",
    "emission_standard" : "GBXXXXX-XXXX",
    "fuel_consumption" : "xx",
    "overall_dimension_length" : "xx35",
    "overall_dimension_width" : "17xx",
    "overall_dimension_height" : "14xx",
    "container_dimension_length" : "x",
    "container_dimension_width" : "x",
    "container_dimension_height" : "x",
    "spring_quantity" : "xx",
    "tire_quantity" : "x",
    "tire_size" : "XXXXX.X",
    "front_wheel_track" : "xx27",
    "rear_wheel_track" : "xx26",
    "wheelbase" : "27xx",
    "axle_load" : "xxx/830",
    "axle_quantity" : "x",
    "steering_form" : "方向盘",
    "total_weight" : "xx70",
    "equipment_weight" : "xx40",
    "maximum_laden_mass" : "x",
    "mass_utilization_coefficient" : "x",
    "traction_weight" : "x",
    "maximum_load_mass" : "x",
    "cab_passenger_capacity" : "x",
    "passenger_capacity" : "x",
    "max_design_speed" : "xxx",
    "manufacture_date" : "2022年10月xxx日",
    "confidence" : {
      "certificate_number" : 0.9856,
      "issue_date" : 0.9931,
      "manufacture_name" : 0.9485,
      "vehicle_brand" : 0.9612,
      "vehicle_name" : 0.9562,
      "vehicle_model" : 0.9741,
      "vin" : 0.9963,
      "vehicle_color" : 0.9645,
      "chassis_model" : 0,
      "chassis_id" : 0,
      "chassis_certificate_number" : 0,
      "engine_model" : 0.9745,
      "engine_number" : 0.9384,
      "fuel_type" : 0.9845,
      "displacement" : 0.9954,
      "power" : 0.9861,
      "emission_standard" : 0.9864,
      "fuel_consumption" : 0.9952,
      "overall_dimension_length" : 0.9995,
      "overall_dimension_width" : 0.9996,
      "overall_dimension_height" : 0.9982,
      "container_dimension_length" : 0,
      "container_dimension_width" : 0,
      "container_dimension_height" : 0,
      "spring_quantity" : 0,
      "tire_quantity" : 0.9984,
      "tire_size" : 0.9631,
      "front_wheel_track" : 0.9815,
      "rear_wheel_track" : 0.9951,
      "wheelbase" : 0.9762,
      "axle_load" : 0.9978,
      "axle_quantity" : 0.9982,
      "steering_form" : 0.9946,
      "total_weight" : 0.9863,
      "equipment_weight" : 0.9975,
      "maximum_laden_mass" : 0,
      "mass_utilization_coefficient" : 0,
      "traction_weight" : 0,
      "maximum_load_mass" : 0,
      "cab_passenger_capacity" : 0,
      "passenger_capacity" : 0.9992,
      "max_design_speed" : 0.9999,
      "manufacture_date" : 0.9856
    }
  }
}

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。

  • 传入车辆合格证图片的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 RecognizeVehicleCertificateSolution {
    
        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();
            RecognizeVehicleCertificateRequest request = new RecognizeVehicleCertificateRequest();
            VehicleCertificateRequestBody body = new VehicleCertificateRequestBody();
            body.withImage("/9j/4AAQSkZJRgABAgEASABIAAD/4RFZRXhpZgAATU0AKgAAAA...");
            request.withBody(body);
            try {
                RecognizeVehicleCertificateResponse response = client.recognizeVehicleCertificate(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());
            }
        }
    }
    
  • 传入车辆合格证图片的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 RecognizeVehicleCertificateSolution {
    
        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();
            RecognizeVehicleCertificateRequest request = new RecognizeVehicleCertificateRequest();
            VehicleCertificateRequestBody body = new VehicleCertificateRequestBody();
            body.withUrl("https://BucketName.obs.myhuaweicloud.com/ObjectName");
            request.withBody(body);
            try {
                RecognizeVehicleCertificateResponse response = client.recognizeVehicleCertificate(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());
            }
        }
    }
    
  • 传入车辆合格证图片的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 = RecognizeVehicleCertificateRequest()
            request.body = VehicleCertificateRequestBody(
                image="/9j/4AAQSkZJRgABAgEASABIAAD/4RFZRXhpZgAATU0AKgAAAA..."
            )
            response = client.recognize_vehicle_certificate(request)
            print(response)
        except exceptions.ClientRequestException as e:
            print(e.status_code)
            print(e.request_id)
            print(e.error_code)
            print(e.error_msg)
    
  • 传入车辆合格证图片的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 = RecognizeVehicleCertificateRequest()
            request.body = VehicleCertificateRequestBody(
                url="https://BucketName.obs.myhuaweicloud.com/ObjectName"
            )
            response = client.recognize_vehicle_certificate(request)
            print(response)
        except exceptions.ClientRequestException as e:
            print(e.status_code)
            print(e.request_id)
            print(e.error_code)
            print(e.error_msg)
    
  • 传入车辆合格证图片的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.RecognizeVehicleCertificateRequest{}
    	imageVehicleCertificateRequestBody:= "/9j/4AAQSkZJRgABAgEASABIAAD/4RFZRXhpZgAATU0AKgAAAA..."
    	request.Body = &model.VehicleCertificateRequestBody{
    		Image: &imageVehicleCertificateRequestBody,
    	}
    	response, err := client.RecognizeVehicleCertificate(request)
    	if err == nil {
            fmt.Printf("%+v\n", response)
        } else {
            fmt.Println(err)
        }
    }
    
  • 传入车辆合格证图片的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.RecognizeVehicleCertificateRequest{}
    	urlVehicleCertificateRequestBody:= "https://BucketName.obs.myhuaweicloud.com/ObjectName"
    	request.Body = &model.VehicleCertificateRequestBody{
    		Url: &urlVehicleCertificateRequestBody,
    	}
    	response, err := client.RecognizeVehicleCertificate(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。

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描述

200

成功响应示例

400

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错误码

错误码请参见错误码

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