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Visual features of images and video frames have become pervasive and maturely developed in extensive research fields such as computer vision and visual search. For realtime retrieval applications, the compact visual features should be transmitted and stored at server side in cloud. These local feature descriptors are characterized by the invariance properties for the variances caused by camera motion,...
We consider the problem of indexing and searching image duplicates in streaming visual data. This task requires a fast image descriptor, a small memory footprint for each signature and a quick search algorithm. To this end, we propose a new descriptor satisfying the aforementioned requirements. We evaluate our method on two different datasets with the use of different sets of distractor images, leading...
In this paper, we use a novel multi-bit minimum error replacement with flexible bit location (multi-bit MER_FBL) embedding method to perform watermarking for embedding multi-bit logo images into the JPEG2000 data stream. The novel multi-bit MER_FBL embedding method embeds multi-bit logo data into the JPEG2000 data stream after quantizing the DWT coefficients. Because the proposed embedding method...
This paper discusses a technique used to insert a watermark into scanned colored PDF files. The watermarking aims to protect the copyright ownership and authenticate the PDF documents. A logo has been used as a robust watermark for copyright. The logo will be embedded in the green channel of the file. This watermark can be successfully extracted and it can survive against different attacks. Any manipulations...
In this paper, we investigate the robustness achieved by hard-input hard-output (HIHO) turbo product code (TPC) in a grayscale image watermarking. The TPC scheme is based on the concatenation of a BCH product code. The general concept of the TPC is to construct two or more simple codes in order to achieve remarkable error performance. Unlike many proposed algorithms in the literature, HIHO-TPC require...
Video watermarking plays a key role in copyright protection domain of today's world. In the following paper, a blind watermarking algorithm is being proposed in which the watermark information is being embedded by little alteration of some of the value of DCT coefficients of luminance part of video during encoding it in MPEG-2 style. It is obvious that for any type of watermarking the three parameters,...
The availability of digital data such as images, audio and videos to the public is growing day by day with the expansion of the Internet. Hence preserving the rightfulness of the data is a critical factor and the solution is effectively provided by digital watermarking. Digital watermarking is a developing technology which ensures and facilitates security, authentication and copyright protection of...
Digital multimedia technology has shown a significant progress day to day in various fields such as entertainment, computer vision, security etc. hence, the distribution and use of multimedia data is much easier and faster. In such an open environment, it is convenient to get the access to various information sources. In present time, several issues are arising such as information security, information...
The most common method of tampering with a digital image is copy-move forgery, in which a part of an image is duplicated and used to substitute another part of the same image at a different location. In this paper, we present an efficient and robust method to detect such artifacts. First, the tampered image is segmented into overlapping fixed-size blocks, and the Gabor filter is applied to each block...
For reliably protecting the rights of multimedia data owners, digital watermarking techniques appear to be the best solution. A digital watermark is a code which is hidden into the multimedia data for carrying information regarding the copyright. In this paper the problem of the reliable identification of the watermark, in absence of the original unmarked image, is addressed. An optimum (based on...
In this paper a method is presented for copyright protection in digital images. Copyright protection is achieved by embedding an invisible signal, known as digital signature or watermark, in the digital image. The method proposed in this paper casts the signature in the frequency domain by slightly modifying the values of randomly selected DC coefficients of the Discrete Cosine Transform (DCT) of...
In this paper we present an original way to mark images. Firstly the different techniques in watermarking are presented. In a second part our approach is outlined. It consists in searching an IFS (Iterated function systems) in the image to hide new similarities in it. In a third part two different algorithms are presented: the first uses the luminance domain, the second uses the DCT (Discrete Cosine...
This paper proposes an effective multiple watermarking algorithm based on Discrete Wavelet Transform for audio signal. This approach embeds multiple gray images inside the detailed coefficient of Discrete Wavelet Transform at the first and second level decomposition. Embedded multiple watermark can be easily and faithfully recovered under different common signal processing attacks such as high pass...
In this paper, we propose a novel dense correspondence based prediction approach to reduce the inter-image redundancy for image set compression. Unlike previous methods, we manage to utilize the dense correspondence to predict and parameterize the inter-image relation and then reconstruct a new reference for the subsequent HEVC inter-prediction and encoding. Comparing to relevant state-of-the-art...
Recently, we demonstrated that random projections can provide an extremely compact representation of a camera fingerprint without significantly affecting the matching performance. In this paper, we propose a new construction that makes random projections of camera fingerprints scale-robust. The proposed method maps the compressed fingerprint of a rescaled image to the compressed fingerprint of the...
Lossy compression is inherently contradictory with watermarking and makes the watermark retrieval unreliable. In this paper, we propose a watermarking technique capable to correctly retrieve watermark in both image and video, where watermarking is combined with JPEG/MPEG compression standards to adaptively obtain a proper trade-off among imperceptibility, achievable embedding capacity and robustness...
In this paper, we present a robust watermarking technique that uses the wavelet based hard thresholding concept for image denoising to determine the wavelet coefficients to be watermarked. A multi-bit watermark is embedded into the discrete wavelet coefficients of a still image. A corresponding blind watermark extraction algorithm is proposed. The proposed method is compared with other multiresolution...
In this paper, we utilized the relationship between two blocks to generate the robust feature. Such a feature is very stable under various image processing operations. The XOR operation is applied to the feature and the watermark to create the secret key. Moreover, a mechanism is developed to resist the cropping attacks. The experimental results demonstrate our technique is highly robust against image...
During the last few years multimedia systems success has been definitely spurred by the development of network-based on line services, like electronic commerce, teleducation, teletraining, media distribution and so on, in which multimedia systems have a major role. In this new scenario the request for privacy, security and authenticity of the documents, undergone to these transactions, is strongly...
This paper proposes an image adaptive watermark embedding method based on discrete wavelet transform (DWT). To increase the robustness and perceptual invisibility of watermark, the algorithm is combined with the quantization model based on human visual system (HVS). Number of factors that affect the noise sensitivity of human eye, such as background luminance, proximity to an edge, frequency band...
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