Copyright protection of digital images by means of frequency domain watermarking

1998 ◽  
Author(s):  
Alessandro Piva ◽  
Mauro Barni ◽  
Franco Bartolini
Keyword(s):  
Frequency Domain ◽  
Copyright Protection ◽  
Digital Images

Two Spatial Watermarking Techniques for Digital Images

2013 ◽  
pp. 691-712
Author(s):  
Dumitru Dan Burdescu ◽  
Liana Stanescu ◽  
Marian Cristian Mihaescu
Keyword(s):  
Digital Watermarking ◽  
Copyright Protection ◽  
Digital Images ◽  
Multimedia Data ◽  
Effective Measure ◽  
Digital Multimedia ◽  
Black And White ◽  
Robust Watermark ◽  
Multimedia Technologies ◽  
New Algorithms

The rapid growth of digital multimedia technologies brings tremendous attention to the field of digital authentication. Digital watermarking has become widely recognized as an effective measure for copyright protection of multimedia data. The owner or the distributor of the digital images can insert a unique watermark into copies for different customers or receivers, which will be helpful to identify the source of illegal copies. In this chapter the authors present two original spatial authentication techniques for digital images. These new algorithms yield an invisible watermark that is robust to various kinds of attacks. The main principle is the utilization of a virtual (2D or 3D) graph embedded into the digital images. Then, the colors of some vertices of the virtual graph are slightly modified for obtaining the watermark. The proposed techniques modify pixels or voxels of the object by a spatial watermark insertion scheme. These techniques can be used for all kinds of digital images, color or black and white, and the new algorithms produce an invisible robust watermark. The techniques lower the computational complexity that normally rises with the traditional watermarking algorithms. This approach reduces computation and implementation complexity of the algorithms. These techniques seem to replace advantages of the transform domain techniques with those of the spatial domain techniques.

Median filtering forensics in digital images based on frequency-domain features

2017 ◽  
Vol 76 (21) ◽  
pp. 22119-22132 ◽  
Author(s):  
Anan Liu ◽  
Zhengyu Zhao ◽  
Chengqian Zhang ◽  
Yuting Su
Keyword(s):  
Frequency Domain ◽  
Digital Images ◽  
Median Filtering

scholarly journals Application of two-dimensional fast Fourier transform algorithm, analog of the Cooley-Tukey algorithm, for 4k fixed format digital image of satellite data in frequency domain processing

2020 ◽  
Vol 149 ◽  
pp. 02010 ◽  
Author(s):  
Mikhail Noskov ◽  
Valeriy Tutatchikov
Keyword(s):  
Fourier Transform ◽  
Numerical Experiment ◽  
Fast Fourier Transform ◽  
Frequency Domain ◽  
Discrete Fourier Transform ◽  
Satellite Data ◽  
Digital Image ◽  
Digital Images ◽  
Two Dimensional ◽  
Fast Fourier Transform Algorithm

Currently, digital images in the format Full HD (1920 * 1080 pixels) and 4K (4096 * 3072) are widespread. This article will consider the option of processing a similar image in the frequency domain. As an example, take a snapshot of the earth's surface. The discrete Fourier transform will be computed using a two-dimensional analogue of the Cooley-Tukey algorithm and in a standard way by rows and columns. Let us compare the required number of operations and the results of a numerical experiment. Consider the examples of image filtering.

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