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Blind Watermark

Last updated: 2022-08-09 15:09:40

    Overview

    This document provides an overview of APIs and SDK code samples for blind watermarking.

    API Description
    Blind watermarking Adds blind watermark to or extracts blind watermark from local image and uploads it to bucket.

    Adding Blind Watermark

    Feature description

    You can add a blind watermark when uploading or downloading an object.

    Sample: Adding a blind watermark during upload

    // The bucket name must contain `appid`.
    // For the API description, visit https://www.tencentcloud.com/document/product/436/46782?from_cn_redirect=1.
    String bucketName = "examplebucket-1250000000";
    String key = "test.png";
    File localFile = new File("E://test.png");
    PutObjectRequest putObjectRequest = new PutObjectRequest(bucketName, key, localFile);
    PicOperations picOperations = new PicOperations();
    picOperations.setIsPicInfo(1);
    List<PicOperations.Rule> ruleList = new LinkedList<>();
    PicOperations.Rule rule = new PicOperations.Rule();
    rule.setBucket(bucketName);
    rule.setFileId("test-watermark.png");
    rule.setRule("watermark/3/type/3/text/dGVuY2VudCBjbG91ZA==");
    ruleList.add(rule);
    picOperations.setRules(ruleList);
    putObjectRequest.setPicOperations(picOperations);
    try {
       PutObjectResult putObjectResult = cosClient.putObject(putObjectRequest);
       CIUploadResult ciUploadResult = putObjectResult.getCiUploadResult();
       System.out.println(putObjectResult.getRequestId());
       System.out.println(ciUploadResult.getOriginalInfo().getEtag());
       for(CIObject ciObject:ciUploadResult.getProcessResults().getObjectList()) {
           System.out.println(ciObject.getLocation());
       }
    } catch (CosServiceException e) {
       e.printStackTrace();
    } catch (CosClientException e) {
       e.printStackTrace();
    }
    

    Parameter description

    The PicOperations class is used to record image operations. Its main members are as described below:

    Member Description Type
    isPicInfo Whether to return the input image information. Valid values: 0 (no), 1 (yes). Default value: 0. int
    rules Processing rules (up to five rules are supported). Each rule corresponds to one processing result. If this parameter is not specified, images will not be processed. List

    Response parameter description

    The CIUploadResult class is used to return the image processing result. Its main members are as described below:

    Member Description Type
    originalInfo Input image information OriginalInfo
    processResults Image processing result ProcessResults

    The OriginalInfo class is used to record the input image information. Its main members are as described below:

    Member Description Type
    key Name of the input image String
    location Image path String
    imageInfo Input image information ImageInfo

    The ImageInfo class is used to record the input image information. Its main members are as described below:

    Member Description Type
    format Format String
    width Image width Integer
    height Image height Integer
    quality Image quality Integer
    ave Image average hue String
    orientation Image rotation angle Integer

    The ProcessResults class is used to record the image processing results. Its main members are as described below:

    Member Description Type
    objectList Processing result of each image List

    The CIObject class is used to record the processing result of a single image. Its main members are as described below:

    Member Description Type
    key Filename String
    location Image path String
    format Image format String
    width Image width Integer
    height Image height Integer
    size Image size Integer
    quality Image quality Integer

    Sample: Adding a blind watermark during download

    GetObjectRequest getObj = new GetObjectRequest(bucketName, key);
    // The following are blind watermarking rules. For more information, see the API description of CI.
    String rule = "watermark/3/type/3/text/dGVuY2VudCBjbG91ZA==";
    getObj.putCustomQueryParameter(rule, null);
    cosClient.getObject(getObj);
    

    Extracting Blind Watermark

    The following example shows how to extract a blind watermark from an image.

    Sample code

    String bucketName = "examplebucket-1250000000";
    String key = "qrcode-watermark.png";
    File localFile = new File("E://qrcode-watermark.png");
    PutObjectRequest putObjectRequest = new PutObjectRequest(bucketName, key, localFile);
    PicOperations picOperations = new PicOperations();
    picOperations.setIsPicInfo(1);
    List<PicOperations.Rule> ruleList = new LinkedList<>();
    PicOperations.Rule rule = new PicOperations.Rule();
    rule.setBucket(bucketName);
    rule.setFileId("qrcode-watermark-extract.png");
    rule.setRule("watermark/4/type/2/image/aHR0cDovL2V4YW1wbGVidWNrZXQtMTI1MDAwMDAwMC5jb3MuYXAtZ3Vhbmd6aG91Lm15cWNsb3VkLmNvbS9zaHVpeWluLnBuZw==");
    ruleList.add(rule);
    picOperations.setRules(ruleList);
    putObjectRequest.setPicOperations(picOperations);
    try {
       PutObjectResult putObjectResult = cosClient.putObject(putObjectRequest);
       CIUploadResult ciUploadResult = putObjectResult.getCiUploadResult();
       System.out.println(putObjectResult.getRequestId());
       System.out.println(ciUploadResult.getOriginalInfo().getEtag());
       for(CIObject ciObject:ciUploadResult.getProcessResults().getObjectList()) {
           System.out.println(ciObject.getLocation());
           System.out.println(ciObject.getWatermarkStatus());
       }
    } catch (CosServiceException e) {
       e.printStackTrace();
    } catch (CosClientException e) {
       e.printStackTrace();
    }
    

    Parameter description

    The PicOperations class is used to record image operations. Its main members are as described below:

    Member Description Type
    isPicInfo Whether to return the input image information. Valid values: 0 (no), 1 (yes). Default value: 0. int
    rules Processing rules (up to five rules are supported). Each rule corresponds to one processing result. If this parameter is not specified, images will not be processed. List

    Response parameter description

    The CIUploadResult class is used to return the image processing result. Its main members are as described below:

    Member Description Type
    originalInfo Input image information OriginalInfo
    processResults Image processing result ProcessResults

    The OriginalInfo class is used to record the input image information. Its main members are as described below:

    Member Description Type
    key Name of the input image String
    location Image path String
    imageInfo Input image information ImageInfo

    The ImageInfo class is used to record the input image information. Its main members are as described below:

    Member Description Type
    format Format String
    width Image width Integer
    height Image height Integer
    quality Image quality Integer
    ave Image average hue String
    orientation Image rotation angle Integer

    The ProcessResults class is used to record the image processing results. Its main members are as described below:

    Member Description Type
    objectList Processing result of each image List

    The CIObject class is used to record the processing result of a single image. Its main members are as described below:

    Member Description Type
    key Filename String
    location Image path String
    format Image format String
    width Image width Integer
    height Image height Integer
    size Image size Integer
    quality Image quality Integer
    watermarkStatus This parameter will be returned if type is set to 2, indicating the confidence of the extracted watermark. Value range: 0–100. If the value is above 75, there is a confirmed blind watermark. If the value is between 60 and 75, there is a suspected blind watermark. If the value is below 60, no blind watermark is extracted. Integer
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