行驶证识别
功能介绍
识别行驶证图片中主页和副页的文字内容,并将识别的结果以JSON格式返回给用户。该接口的使用限制请参见约束与限制,详细使用指导请参见OCR服务使用简介章节。
如果图片中包含多张卡证票据,请调用智能分类识别服务。
约束与限制
- 只支持中国大陆行驶证的识别。
- 只支持识别PNG、JPG、JPEG、BMP、TIFF格式图片。
- 图像各边的像素大小在100px到8000px之间。
- 图像中行驶证区域有效占比超过5%,保证整张行驶证内容及其边缘包含在图像内。
- 支持图像中行驶证任意角度的水平旋转。
- 支持少量扭曲,扭曲后图像中的行驶证长宽比与实际行驶证相差不超过10%。
- 能处理反光、暗光、防伪标识等干扰的图片但影响识别精度。
- 目前只支持识别2008年版的行驶证。
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和认证鉴权章节。
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-license
请求参数
参数 |
是否必选 |
参数类型 |
描述 |
---|---|---|---|
X-Auth-Token |
是 |
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 |
是 |
String |
发送的实体的MIME类型,参数值为“application/json”。 |
Enterprise-Project-Id |
否 |
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。
|
参数 |
是否必选 |
参数类型 |
说明 |
---|---|---|---|
image |
否 |
String |
该参数与url二选一。 图片的Base64编码,要求Base64编码后大小不超过10MB。 图片最短边不小于100px,最长边不超过8000px。支持JPEG、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 |
否 |
String |
该参数与image二选一。图片的url路径,目前支持:
说明:
|
side |
否 |
String |
检测行驶证的主页或副页。
如果参数值为空或无该参数,系统默认识别主页,建议填写,准确率更高。 |
return_issuing_authority |
否 |
Boolean |
是否返回发证机关的开关,可选值包括:
如果无该参数,系统默认不返回发证机关。如果输入参数不是Boolean类型,则会报非法参数错误。 |
return_text_location |
否 |
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
根据识别的结果,可能有不同的HTTP响应状态码(status code)。例如,200表示API调用成功,400表示调用失败,详细的状态码和响应参数说明如下。
状态码: 200
参数 |
参数类型 |
描述 |
---|---|---|
result |
VehicleLicenseResult object |
识别结果。 调用失败时不返回此字段。 |
参数 |
参数类型 |
描述 |
---|---|---|
number |
String |
号牌号码。 |
vehicle_type |
String |
车辆类型。 |
name |
String |
所有人。 |
address |
String |
住址。 |
use_character |
String |
使用性质。 |
model |
String |
品牌型号。 |
engine_no |
String |
发动机号码。 |
vin |
String |
车辆识别代号。 |
register_date |
String |
注册日期。 |
issue_date |
String |
发证日期。 |
issuing_authority |
String |
发证机关。 |
file_no |
String |
档案编码。 |
approved_passengers |
String |
核定载人数。 |
gross_mass |
String |
总质量。 |
unladen_mass |
String |
整备质量。 |
approved_load |
String |
核定载质量。 |
dimension |
String |
外廓尺寸。 |
traction_mass |
String |
准牵引总质量。 |
remarks |
String |
备注。 |
inspection_record |
String |
检验记录。 |
code_number |
String |
条码号。 |
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。 |
energy_type |
String |
能源类型。 |
front |
object |
行驶证主页。当请求参数"side"设置为"double_side"时才返回。 |
back |
object |
行驶证副页。当请求参数"side"设置为"double_side"时才返回。 |
参数 |
参数类型 |
描述 |
---|---|---|
number |
String |
号牌号码。 |
vehicle_type |
String |
车辆类型。 |
name |
String |
所有人。 |
address |
String |
住址。 |
use_character |
String |
使用性质。 |
model |
String |
品牌型号。 |
vin |
String |
车辆识别代号。 |
engine_no |
String |
发动机号码。 |
register_date |
String |
注册日期。 |
issue_date |
String |
发证日期。 |
issuing_authority |
String |
发证机关。 |
text_location |
Object |
文本框在原图位置。输出左上、右上、右下、左下四个点坐标。 当“return_text_location”设置为“true”时才返回。 |
参数 |
参数类型 |
描述 |
---|---|---|
number |
String |
号牌号码。 |
file_no |
String |
档案编码。 |
approved_passengers |
String |
核定载人数。 |
gross_mass |
String |
总质量。 |
unladen_mass |
String |
整备质量。 |
approved_load |
String |
核定载质量。 |
dimension |
String |
外廓尺寸。 |
traction_mass |
String |
准牵引总质量。 |
remarks |
String |
备注。 |
inspection_record |
String |
检验记录。 |
code_number |
String |
条码号。 |
energy_type |
String |
能源类型。 |
text_location |
Object |
文本框在原图位置。输出左上、右上、右下、左下四个点坐标。 当“return_text_location”设置为“true”时才返回。 |
状态码: 400
参数 |
参数类型 |
说明 |
---|---|---|
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 |
调用失败时返回的错误信息。 调用成功时不返回此字段。 |
请求示例
- 传入行驶证主页图片的base64编码进行文字识别,并识别发证机关信息
POST https://{endpoint}/v2/{project_id}/ocr/vehicle-license Request Header: Content-Type: application/json X-Auth-Token: MIINRwYJKoZIhvcNAQcCoIINODCCDTQCAQExDTALBglghkgBZQMEAgEwgguVBgkqhkiG... Request Body: { "image":"/9j/4AAQSkZJRgABAgEASABIAAD/4RFZRXhpZgAATU0AKgAAAAg...", "side":"front", "return_issuing_authority":true }
- 传入行驶证副页图片的url进行文字识别
POST https://{endpoint}/v2/{project_id}/ocr/vehicle-license Request Header: Content-Type: application/json X-Auth-Token: MIINRwYJKoZIhvcNAQcCoIINODCCDTQCAQExDTALBglghkgBZQMEAgEwgguVBgkqhkiG... Request Body: { "url":"https://BucketName.obs.xxxx.com/ObjectName", "side":"back" }
响应示例
状态码: 200
成功响应示例
{ "result" : { "front" : { "number" : "粤B0xxx2", "vehicle_type" : "小型轿车", "name" : "张三", "address" : "xx省xx市xx区xxx街道号", "engine_no" : "601xx99", "vin" : "LPAA3xxxxxxxxx709", "model" : "xx牌CAPxxxxxxC3", "register_date" : "2015-07-07", "issue_date" : "2015-07-08", "use_character" : "非营运" }, "back" : { "number" : "粤B8888", "file_no" : "44xxxxx57436", "approved_passengers" : "5人", "gross_mass" : "1960kg", "unladen_mass" : "1525kg", "approved_load" : "", "dimension" : "4553×1858×1588mm", "traction_mass" : "", "remarks" : "", "inspection_record" : "检验有效期至20xx年xx月粤B(12)汽油", "code_number" : "*44xxx24xxxx49*", "energy_type" : "汽油" } } }
状态码: 400
失败响应示例
{ "result" : { "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。
- 传入行驶证主页图片的base64编码进行文字识别,并识别发证机关信息
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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 RecognizeVehicleLicenseSolution { 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(); RecognizeVehicleLicenseRequest request = new RecognizeVehicleLicenseRequest(); VehicleLicenseRequestBody body = new VehicleLicenseRequestBody(); body.withReturnIssuingAuthority(true); body.withSide("front"); body.withImage("/9j/4AAQSkZJRgABAgEASABIAAD/4RFZRXhpZgAATU0AKgAAAAg..."); request.withBody(body); try { RecognizeVehicleLicenseResponse response = client.recognizeVehicleLicense(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()); } } }
- 传入行驶证副页图片的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 RecognizeVehicleLicenseSolution { 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(); RecognizeVehicleLicenseRequest request = new RecognizeVehicleLicenseRequest(); VehicleLicenseRequestBody body = new VehicleLicenseRequestBody(); body.withSide("back"); body.withUrl("https://BucketName.obs.myhuaweicloud.com/ObjectName"); request.withBody(body); try { RecognizeVehicleLicenseResponse response = client.recognizeVehicleLicense(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()); } } }
- 传入行驶证主页图片的base64编码进行文字识别,并识别发证机关信息
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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 = RecognizeVehicleLicenseRequest() request.body = VehicleLicenseRequestBody( return_issuing_authority=True, side="front", image="/9j/4AAQSkZJRgABAgEASABIAAD/4RFZRXhpZgAATU0AKgAAAAg..." ) response = client.recognize_vehicle_license(request) print(response) except exceptions.ClientRequestException as e: print(e.status_code) print(e.request_id) print(e.error_code) print(e.error_msg)
- 传入行驶证副页图片的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 = RecognizeVehicleLicenseRequest() request.body = VehicleLicenseRequestBody( side="back", url="https://BucketName.obs.myhuaweicloud.com/ObjectName" ) response = client.recognize_vehicle_license(request) print(response) except exceptions.ClientRequestException as e: print(e.status_code) print(e.request_id) print(e.error_code) print(e.error_msg)
- 传入行驶证主页图片的base64编码进行文字识别,并识别发证机关信息
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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.RecognizeVehicleLicenseRequest{} returnIssuingAuthorityVehicleLicenseRequestBody:= true sideVehicleLicenseRequestBody:= "front" imageVehicleLicenseRequestBody:= "/9j/4AAQSkZJRgABAgEASABIAAD/4RFZRXhpZgAATU0AKgAAAAg..." request.Body = &model.VehicleLicenseRequestBody{ ReturnIssuingAuthority: &returnIssuingAuthorityVehicleLicenseRequestBody, Side: &sideVehicleLicenseRequestBody, Image: &imageVehicleLicenseRequestBody, } response, err := client.RecognizeVehicleLicense(request) if err == nil { fmt.Printf("%+v\n", response) } else { fmt.Println(err) } }
- 传入行驶证副页图片的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.RecognizeVehicleLicenseRequest{} sideVehicleLicenseRequestBody:= "back" urlVehicleLicenseRequestBody:= "https://BucketName.obs.myhuaweicloud.com/ObjectName" request.Body = &model.VehicleLicenseRequestBody{ Side: &sideVehicleLicenseRequestBody, Url: &urlVehicleLicenseRequestBody, } response, err := client.RecognizeVehicleLicense(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。