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Blind Watermark

Last updated: 2022-05-24 16:41:41

    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 During Upload

    Feature description

    This API is used to add a blind watermark when uploading images.

    Method prototype

    CosResult PutImage(const PutImageByFileReq& request, PutImageByFileResp* response);
    

    Sample request

    qcloud_cos::CosConfig config("./config.json");
    qcloud_cos::CosAPI cos(config);
    std::string bucket_name = "examplebucket-1250000000";
    PutImageByFileReq req(bucket_name, object_name, local_file);
    PutImageByFileResp resp;
    PicOperation pic_operation;
    PicRules rule;
    // File storage path
    rule.fileid = "/" + object_name + "_watermark";
    // URL-safe Base64-encoded URL of the blind watermark image
    std::string image = "http://" + bucket_name + ".cos.ap-guangzhou.myqcloud.com/" + object_name + "_watermark";
    // Blind watermark processing parameter
    rule.rule = "watermark/3/type/1/image/" + CodecUtil::Base64Encode(image);
    pic_operation.AddRule(rule);
    CosResult result = cos.PutImage(req, &resp);
    if (result.IsSucc()) {
     // The call is successful. You can call the `resp` member functions to get the return content.
    } else {
     // The call failed. You can call the `result` member functions to get the error information.
    } 
    

    Parameter description

    Parameter Description Type Required
    req PutImage operation request. PutImageByFileReq Yes
    resp PutImage operation response. PutImageByFileResp Yes

    Adding Blind Watermark During Download

    Feature description

    This API is used to add a blind watermark when downloading images.

    Method prototype

    CosResult GetObject(const GetObjectByFileReq& request, GetObjectByFileResp* response);
    

    Sample request

    qcloud_cos::CosConfig config("./config.json");
    qcloud_cos::CosAPI cos(config);
    std::string bucket_name = "examplebucket-1250000000";
    GetObjectByFileReq req(bucket_name, object_name, local_file);
    GetObjectByFileResp resp;
    // Blind watermark text
    std::string watermark_text = "test";
    // URL-safe Base64-encoded blind watermark parameter
    std::string watermark_param = "watermark/3/type/3/text/" + CodecUtil::Base64Encode(watermark_text);
    req.AddParam(watermark_param, "");
    CosResult result = cos.GetObject(req, &resp);
    if (result.IsSucc()) {
     // The call is successful. You can call the `resp` member functions to get the return content.
    } else {
     // The call failed. You can call the `result` member functions to get the error information.
    } 
    

    Parameter description

    Parameter Description Type Required
    req PutImage operation request. PutImageByFileReq Yes
    resp PutImage operation response. PutImageByFileResp Yes
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