Help Center/ Data Security Center/ API Reference/ API Description/ Image Watermarking/ Extracting Dark Watermarks from Images (Image Addresses)
Updated on 2024-07-29 GMT+08:00

Extracting Dark Watermarks from Images (Image Addresses)

Function

This API is used to extract invisible text watermarks from an image whose storage address is specified (only a OBS path is supported). The supported image formats include .jpg, .jpeg, .jpe, .png, .bmp, .dib, .rle, .tiff, .tif, .ppm, .webp, .tga, .tpic, and .gif.

Calling Method

For details, see Calling APIs.

URI

POST /v1/{project_id}/image-address/watermark/extract

Table 1 Path Parameters

Parameter

Mandatory

Type

Description

project_id

Yes

String

Project ID.

Request Parameters

Table 2 Request header parameters

Parameter

Mandatory

Type

Description

X-Auth-Token

Yes

String

User token It can be obtained by calling the IAM API used to obtain a user token. The value of X-Subject-Token in the response header is a token.

Table 3 Request body parameters

Parameter

Mandatory

Type

Description

region_id

Yes

String

ID of the region where the project is located, for example, xx-xx-1.

src_file

Yes

String

Address of the image from which the text watermark is to be extracted. Currently, only OBS objects are supported. The format is obs://bucket/object, where bucket indicates the name of the OBS bucket in the same region as the current project, and object indicates the full path name of the object. For example, obs://hwbucket/hwinfo/hw.png, where obs:// indicates OBS, hwbucket indicates the bucket name, and hwinfo/hw.png indicates the full path name of the object.

mark_len

No

Integer

Length of the watermark to be extracted. The value ranges from 0 to 32. This parameter improves watermark extraction performance.

Response Parameters

Status code: 200

Table 4 Response body parameters

Parameter

Type

Description

watermark

String

Invisible watermark. The length cannot exceed 32 characters.

Status code: 400

Table 5 Response body parameters

Parameter

Type

Description

error_code

String

Error Code

error_msg

String

Error Message

Example Requests

Extract the invisible text watermarks from the image at obs://hwbucket/hwinfo/hw.png.

POST /v1/{project_id}/image-address/watermark/extract HTTP/1.1

{
  "region_id" : "xx-xx-1",
  "src_file" : "obs://hwbucket/hwinfo/hw.png"
}

Example Responses

Status code: 200

Request succeeded.

{
  "watermark" : "mark!"
}

Status code: 400

Invalid request

{
  "error_code" : "DSC.00000007 ",
  "error_msg" : "File format error"
}

SDK Sample Code

The SDK sample code is as follows.

Extract the invisible text watermarks from the image at obs://hwbucket/hwinfo/hw.png.

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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.dsc.v1.region.DscRegion;
import com.huaweicloud.sdk.dsc.v1.*;
import com.huaweicloud.sdk.dsc.v1.model.*;


public class ShowImageWatermarkByAddressSolution {

    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);

        DscClient client = DscClient.newBuilder()
                .withCredential(auth)
                .withRegion(DscRegion.valueOf("<YOUR REGION>"))
                .build();
        ShowImageWatermarkByAddressRequest request = new ShowImageWatermarkByAddressRequest();
        ShowImageWatermarkByAddressRequestBody body = new ShowImageWatermarkByAddressRequestBody();
        body.withSrcFile("obs://hwbucket/hwinfo/hw.png");
        body.withRegionId("xx-xx-1");
        request.withBody(body);
        try {
            ShowImageWatermarkByAddressResponse response = client.showImageWatermarkByAddress(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());
        }
    }
}

Extract the invisible text watermarks from the image at obs://hwbucket/hwinfo/hw.png.

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# coding: utf-8

import os
from huaweicloudsdkcore.auth.credentials import BasicCredentials
from huaweicloudsdkdsc.v1.region.dsc_region import DscRegion
from huaweicloudsdkcore.exceptions import exceptions
from huaweicloudsdkdsc.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.environ["CLOUD_SDK_AK"]
    sk = os.environ["CLOUD_SDK_SK"]

    credentials = BasicCredentials(ak, sk)

    client = DscClient.new_builder() \
        .with_credentials(credentials) \
        .with_region(DscRegion.value_of("<YOUR REGION>")) \
        .build()

    try:
        request = ShowImageWatermarkByAddressRequest()
        request.body = ShowImageWatermarkByAddressRequestBody(
            src_file="obs://hwbucket/hwinfo/hw.png",
            region_id="xx-xx-1"
        )
        response = client.show_image_watermark_by_address(request)
        print(response)
    except exceptions.ClientRequestException as e:
        print(e.status_code)
        print(e.request_id)
        print(e.error_code)
        print(e.error_msg)

Extract the invisible text watermarks from the image at obs://hwbucket/hwinfo/hw.png.

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package main

import (
	"fmt"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
    dsc "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/dsc/v1"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/services/dsc/v1/model"
    region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/dsc/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 := dsc.NewDscClient(
        dsc.DscClientBuilder().
            WithRegion(region.ValueOf("<YOUR REGION>")).
            WithCredential(auth).
            Build())

    request := &model.ShowImageWatermarkByAddressRequest{}
	request.Body = &model.ShowImageWatermarkByAddressRequestBody{
		SrcFile: "obs://hwbucket/hwinfo/hw.png",
		RegionId: "xx-xx-1",
	}
	response, err := client.ShowImageWatermarkByAddress(request)
	if err == nil {
        fmt.Printf("%+v\n", response)
    } else {
        fmt.Println(err)
    }
}

For SDK sample code of more programming languages, see the Sample Code tab in API Explorer. SDK sample code can be automatically generated.

Status Codes

Status Code

Description

200

Request succeeded.

400

Invalid request

Error Codes

See Error Codes.