Updated on 2024-02-22 GMT+08:00

Web Image

Function

This API detects and extracts text from web images and converts the text into a structured JSON format.

For details about the constraints on using this API, see Constraints and Limitations. For details about how to use this API, see Introduction to OCR.

Constraints and Limitations

  • English and Chinese are supported but support for traditional Chinese characters is limited.
  • Only images in JPG, JPEG, PNG, BMP, TIFF, TGA, WebP, ICO, PCX, or GIF format can be recognized.
  • Common image types are supported, such as mobile phone or desktop screenshots, e-commerce product images, and advertisement design drawings.
  • No side of the image can be smaller than 15 or larger than 8,192 pixels.
  • The characters to be recognized must occupy more than 60% of the image.
  • The web image to be recognized can be rotated to any angle (direction detection must be enabled).

Calling Method

For details, see Calling APIs.

Prerequisites

Before using this API, subscribe to the service and complete authentication. For details, see Subscribing to an OCR Service and Authentication.

Before you use the service for the first time, subscribe to the service by clicking Subscribe. You only need to subscribe to the service once. If you have not subscribed to the service yet, error "ModelArts.4204" will be displayed when you call this API. Before you call the API, log in to the OCR console and subscribe to the corresponding service. Ensure that you make the subscription to the service in the same region where you want to call this API.

URI

POST /v2/{project_id}/ocr/web-image

Table 1 URI parameters

Parameter

Mandatory

Description

endpoint

Yes

Endpoint, which is the request address for calling an API.

The endpoint varies depending on services in different regions. For more details, see Endpoints.

project_id

Yes

Project ID, which can be obtained from Obtaining a Project ID.

Request Parameters

Table 2 Request header parameters

Parameter

Mandatory

Type

Description

X-Auth-Token

Yes

String

User token

Used to obtain the permission to call APIs. The token is the value of X-Subject-Token in the response header in Authentication.

Content-Type

Yes

String

MIME type of the request body. The value is application/json.

Table 3 Request body parameters

Parameter

Mandatory

Type

Description

image

No

String

Set either this parameter or url.

Base64-encoded image file. The image file has a size limit of 10 MB.

No side of the image can be smaller than 15 or larger than 8,192 pixels. Only images in JPG, JPEG, PNG, BMP, TIFF, TGA, WebP, ICO, PCX, or GIF format can be recognized.

An example is /9j/4AAQSkZJRgABAg.... If the image data contains an unnecessary prefix, the error "The image format is not supported" is reported.

url

No

String

Set either this parameter or image. Image URL. Currently, the following URLs are supported:

  • Public HTTP/HTTPS URL
  • URL provided by OBS. You need to be authorized to use OBS data, including service authorization, temporary authorization, and anonymous public authorization. For details, see Configuring Access Permissions of OBS.
NOTE:
  • The API response time depends on the image download time. If the image download takes a long time, the API call will fail.
  • Ensure that the storage service where the image to be detected resides is stable and reliable. OBS is recommended for storing image data.
  • The URL cannot contain Chinese characters. If Chinese characters exist, they must be encoded using UTF-8.

detect_direction

No

Boolean

Whether to align the tilted image. The options are as follows:

  • true: The tilted image will be aligned.
  • false: The tilted image will not be aligned.

An image tilted to any angle can be aligned. If this parameter is not specified, false is used by default.

If the image to be recognized is tilted, you are advised to set this parameter to true.

extract_type

No

Array of strings

Structured data extraction parameter list. Currently, only the image width and height are supported. The input parameter value of the image width and height is image_size.

If this parameter is not set or is deleted, this parameter will not be used.

detect_font

No

Boolean

The value is of the Boolean type. If this parameter is not specified, slice fonts are not detected by default. If this parameter is set to True, the slice font type is detected and the five most similar font names are returned.

detect_text_direction

No

Boolean

The value is of the Boolean type. If this parameter is not transferred, the default value True is used, indicating that the text direction of each field is detected. If this parameter is set to False, the text direction is not detected. If all text in the image faces up, you are advised to set this parameter to False.

Response Parameters

The status code may vary depending on the recognition results. For example, 200 indicates that the API is successfully called, and 400 indicates that the API fails to be called. The following describes the status codes and corresponding response parameters.

Status code: 200

Table 4 Response body parameter

Parameter

Type

Description

result

WebImageResult object

Calling result of a successful API call

This parameter is not included when the API fails to be called.

Table 5 WebImageResult

Parameter

Type

Description

words_block_count

Integer

This parameter is not included when the API fails to be called.

words_block_list

Array of WebImageWordsBlockList objects

List of text blocks to be recognized. The output sequence is from left to right and from top to bottom.

extracted_data

WebImageExtractedData object

Structured JSON results extracted. The key value in the dictionary is the same as the value of extract_type in the input parameter list. Currently, only the contact (contact_info) and image size (image_size) can be extracted.

If extract_type is left blank or missing, no information is extracted.

Table 6 WebImageWordsBlockList

Parameter

Type

Description

words

String

Recognition result of a text block

confidence

Float

Confidence of related fields. A higher confidence indicates a higher accuracy of the field identified. The confidence is calculated using algorithms and is not equal to the accuracy.

location

Array<Array<Integer>>

List of location information about a text block, including the 2D coordinates (x, y) of four vertexes in the text area, where the coordinate origin is the upper-left corner of the image, the X axis is horizontal, and the Y axis is vertical.

font_list

Array of strings

Font type of a text block, in list format, indicating the font type closest to the font of the text in a text block.

font_scores

Array of numbers

Probability of the font type to which a text block belongs, in list format, corresponding to font_list, indicating the probability that the text in a text block belongs to a font type.

Table 7 WebImageExtractedData

Parameter

Type

Description

contact_info

WebImageContactInfo object

Extracted contact information, including the name, phone number, province, city, and detailed address. If extract_type does not contain this parameter, this parameter is not included in the response.

image_size

WebImageImageSize object

Width and height of an image. If extract_type does not contain this parameter, this parameter is not included in the response.

Table 8 WebImageContactInfo

Parameter

Type

Description

name

String

Name, which is returned when contact_info is specified

phone

String

Contact phone number, which is returned when contact_info is specified

province

String

Province, which is returned when contact_info is specified

city

String

City, which is returned when contact_info is specified

district

String

County or district, which is returned when contact_info is specified

detail_address

String

Detailed address (excluding the province, city, and county or district), which is returned when contact_info is specified

Table 9 WebImageImageSize

Parameter

Type

Description

height

Integer

Image height, which is returned when image_size is specified

width

Integer

Image width, which is returned when image_size is specified

Status code: 400

Table 10 Response body parameters

Parameter

Type

Description

error_code

String

Error code of a failed API call. For details, see Error Codes.

If error code ModelArts.4204 is displayed, refer to Why Is a Message Stating "ModelArts.4204" Displayed When the OCR API Is Called?

This parameter is not returned when the API is successfully called.

error_msg

String

Error message when the API call fails. This parameter is not included when the API is successfully called.

Example Request

  • endpoint is the request URL for calling an API. Endpoints vary depending on services and regions. For details, see Endpoints.

    For example, Web Image OCR is deployed in the AP-Bangkok region. The endpoint is ocr.ap-southeast-2.myhuaweicloud.com or ocr.ap-southeast-2.myhuaweicloud.cn. The request URL is https://ocr.ap-southeast-2.myhuaweicloud.com/v2/{project_id}/ocr/web-image. project_id is the project ID. For details about how to obtain the project ID, see Obtaining a Project ID.

  • For details about how to obtain a token, see Authentication.
  • Transfer the Base64 code of a web image for recognition.
    POST https://{endpoint}/v2/{project_id}/ocr/web-image
    Request Header:
    Content-Type: application/json
    X-Auth-Token: MIINRwYJKoZIhvcNAQcCoIINODCCDTQCAQExDTALBglghkgBZQMEAgEwgguVBgkqhkiG...
    
    Request Body:  
    {  
        "image":"/9j/4AAQSkZJRgABAgEASABIAAD/..."
    }
  • Transfer the URL of a web image for recognition.
    POST https://{endpoint}/v2/{project_id}/ocr/web-image
    Request Header:   
    Content-Type: application/json   
    X-Auth-Token: MIINRwYJKoZIhvcNAQcCoIINODCCDTQCAQExDTALBglghkgBZQMEAgEwgguVBgkqhkiG...       
    Request Body:
    {
         "url":"https://BucketName.obs.xxxx.com/ObjectName"
    }

Example Response

Status code: 200

Example response for a successful request

{ 
  "result": { 
      "words_block_count": 2, 
      "words_block_list": [ 
          { 
              "words": "Text block 1",
              "confidence": 0.9950,
              "location": [ 
                  [13, 476], 
                  [91, 332], 
                  [125, 351], 
                  [48, 494] 
              ] 
          }, 
          { 
              "words": "Text block 2",
              "confidence": 0.9910,
              "location": [ 
                  [13, 476], 
                  [91, 332], 
              "location": [ 
                  [13, 476], 
                  [91, 332], 
                  [125, 351], 
                  [48, 494] 
              ] 
          }, 
          { 
              "words": "Text block 2",
              "confidence": 0.9910,
              "location": [ 
                  [13, 476], 
                  [91, 332], 
                  [125, 351], 
                  [48, 494] 
              ] 
          } 
      ],
      "extracted_data": {}
  } 
}

Status code: 400

Example response for a failed request

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

Example SDK Code

The example SDK code is as follows:

  • Transfer the Base64 code of a web image for recognition. During the recognition, the service verifies the tilt angle of the image, determines the font type to be recognized, and checks whether the image contains contact information.
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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.*;
    
    import java.util.List;
    import java.util.ArrayList;
    
    public class RecognizeWebImageSolution {
    
        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();
            RecognizeWebImageRequest request = new RecognizeWebImageRequest();
            WebImageRequestBody body = new WebImageRequestBody();
            List<String> listbodyExtractType = new ArrayList<>();
            listbodyExtractType.add("contact_info");
            listbodyExtractType.add("image_size");
            body.withDetectFont(true);
            body.withExtractType(listbodyExtractType);
            body.withDetectDirection(true);
            body.withImage("/9j/4AAQSkZJRgABAgEASABIAAD/4RFZRXhpZgAATU0AKgAAAA...");
            request.withBody(body);
            try {
                RecognizeWebImageResponse response = client.recognizeWebImage(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());
            }
        }
    }
    
  • Transfer the URL of a web image for recognition. During the recognition, the service verifies the tilt angle of the image, determines the font type to be recognized, and checks whether the image contains contact information.
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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.*;
    
    import java.util.List;
    import java.util.ArrayList;
    
    public class RecognizeWebImageSolution {
    
        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();
            RecognizeWebImageRequest request = new RecognizeWebImageRequest();
            WebImageRequestBody body = new WebImageRequestBody();
            List<String> listbodyExtractType = new ArrayList<>();
            listbodyExtractType.add("contact_info");
            listbodyExtractType.add("image_size");
            body.withDetectFont(true);
            body.withExtractType(listbodyExtractType);
            body.withDetectDirection(true);
            body.withUrl("https://BucketName.obs.myhuaweicloud.com/ObjectName");
            request.withBody(body);
            try {
                RecognizeWebImageResponse response = client.recognizeWebImage(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());
            }
        }
    }
    
  • Transfer the Base64 code of a web image for recognition. During the recognition, the service verifies the tilt angle of the image, determines the font type to be recognized, and checks whether the image contains contact information.
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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 = RecognizeWebImageRequest()
            listExtractTypebody = [
                "contact_info",
                "image_size"
            ]
            request.body = WebImageRequestBody(
                detect_font=True,
                extract_type=listExtractTypebody,
                detect_direction=True,
                image="/9j/4AAQSkZJRgABAgEASABIAAD/4RFZRXhpZgAATU0AKgAAAA..."
            )
            response = client.recognize_web_image(request)
            print(response)
        except exceptions.ClientRequestException as e:
            print(e.status_code)
            print(e.request_id)
            print(e.error_code)
            print(e.error_msg)
    
  • Transfer the URL of a web image for recognition. During the recognition, the service verifies the tilt angle of the image, determines the font type to be recognized, and checks whether the image contains contact information.
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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 = RecognizeWebImageRequest()
            listExtractTypebody = [
                "contact_info",
                "image_size"
            ]
            request.body = WebImageRequestBody(
                detect_font=True,
                extract_type=listExtractTypebody,
                detect_direction=True,
                url="https://BucketName.obs.myhuaweicloud.com/ObjectName"
            )
            response = client.recognize_web_image(request)
            print(response)
        except exceptions.ClientRequestException as e:
            print(e.status_code)
            print(e.request_id)
            print(e.error_code)
            print(e.error_msg)
    
  • Transfer the Base64 code of a web image for recognition. During the recognition, the service verifies the tilt angle of the image, determines the font type to be recognized, and checks whether the image contains contact information.
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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.RecognizeWebImageRequest{}
    	var listExtractTypebody = []string{
            "contact_info",
    	    "image_size",
        }
    	detectFontWebImageRequestBody:= true
    	detectDirectionWebImageRequestBody:= true
    	imageWebImageRequestBody:= "/9j/4AAQSkZJRgABAgEASABIAAD/4RFZRXhpZgAATU0AKgAAAA..."
    	request.Body = &model.WebImageRequestBody{
    		DetectFont: &detectFontWebImageRequestBody,
    		ExtractType: &listExtractTypebody,
    		DetectDirection: &detectDirectionWebImageRequestBody,
    		Image: &imageWebImageRequestBody,
    	}
    	response, err := client.RecognizeWebImage(request)
    	if err == nil {
            fmt.Printf("%+v\n", response)
        } else {
            fmt.Println(err)
        }
    }
    
  • Transfer the URL of a web image for recognition. During the recognition, the service verifies the tilt angle of the image, determines the font type to be recognized, and checks whether the image contains contact information.
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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.RecognizeWebImageRequest{}
    	var listExtractTypebody = []string{
            "contact_info",
    	    "image_size",
        }
    	detectFontWebImageRequestBody:= true
    	detectDirectionWebImageRequestBody:= true
    	urlWebImageRequestBody:= "https://BucketName.obs.myhuaweicloud.com/ObjectName"
    	request.Body = &model.WebImageRequestBody{
    		DetectFont: &detectFontWebImageRequestBody,
    		ExtractType: &listExtractTypebody,
    		DetectDirection: &detectDirectionWebImageRequestBody,
    		Url: &urlWebImageRequestBody,
    	}
    	response, err := client.RecognizeWebImage(request)
    	if err == nil {
            fmt.Printf("%+v\n", response)
        } else {
            fmt.Println(err)
        }
    }
    

For more SDK code examples in various programming languages, see the Sample Code tab on the right of the API Explorer page, which can automatically generate corresponding SDK code examples.

Status Codes

Status Code

Description

200

Example response for a successful request

400

Example response for a failed request

See Status Codes.

Error Codes

See Error Codes.