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Blind Watermark
Last updated: 2024-02-29 17:31:27
Blind Watermark
Last updated: 2024-02-29 17:31:27

Overview

This document provides an overview of APIs and SDK code samples for blind watermarking.
API
Description
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/436/49729.
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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