Differential Entropy Approximations and Diffusive Restoration of Digital Images

One method successfully employed to denoise digital images is the diffusive iterative filtering. An important point of this technique is the estimation of the stopping time of the diffusion process. In this paper, we propose a stopping time criterion based on the evolution of the negentropy of the ’noise signal’ with the diffusion parameter. The nonlinear diffusive filter implemented with this stopping criterion is evaluated by using several noisy test images with different statistics. Assuming that images are corrupted by additive Gaussian noise, a statistical measure of the Gaussianity can be used to estimate the amount of noise removed from noisy images. In particular, the differential entropy function or, equivalently, the negentropy are robust measures of the Gaussianity. Because of computational complexity of the negentropy function, it is estimated by using an approximation of the negentropy introduced by Hyv¨arinen in the context of independent component analysis.

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Reduction in size of digital images: does it lead to less detectability or loss of diagnostic information?

Dentomaxillofacial Radiology ◽

10.1038/sj.dmfr.4600329 ◽

1998 ◽

Vol 27 (2) ◽

pp. 93-96 ◽

Cited By ~ 12

Author(s):

C H Versteeg ◽

G C H Sanderink ◽

S R Lobach ◽

P F van der Stelt

Keyword(s):

Digital Images ◽

Diagnostic Information

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Development of a system for craniofacial analysis from monitor-displayed digital images

Dentomaxillofacial Radiology ◽

10.1038/sj.dmfr.4600420 ◽

1999 ◽

Vol 28 (2) ◽

pp. 123-126 ◽

Cited By ~ 28

Author(s):

E Gotfredsen ◽

J Kragskov ◽

A Wenzel

Keyword(s):

Digital Images

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Authentication of Digital Image using Exif Metadata and Decoding Properties

International Journal of Scientific Research in Computer Science Engineering and Information Technology ◽

10.32628/cseit183815 ◽

2018 ◽

pp. 335-341 ◽

Cited By ~ 1

Author(s):

D. P. Gangwar ◽

Anju Pathania

Keyword(s):

Digital Image ◽

Digital Images ◽

Software Tools ◽

Robust Analysis

This work presents a robust analysis of digital images to detect the modifications/ morphing/ editing signs by using the image’s exif metadata, thumbnail, camera traces, image markers, Huffman codec and Markers, Compression signatures etc. properties. The details of the whole methodology and findings are described in the present work. The main advantage of the methodology is that the whole analysis has been done by using software/tools which are easily available in open sources.

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Selection of the efficient video data processing strategy based on the analysis of statistical digital images characteristics

Scientific journal of the Ternopil national technical university ◽

10.33108/visnyk_tntu2018.03.107 ◽

2018 ◽

Vol 91 (3) ◽

pp. 107-114

Author(s):

Mykhailo Palamar ◽

Myroslava Yavorska ◽

Mykhailo Strembitskyi ◽

Volodymyr Strembitskyi

Keyword(s):

Data Processing ◽

Digital Images ◽

Video Data ◽

Processing Strategy ◽

Efficient Video ◽

Selection Of

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I Think We’re Alone Now

Feminist Media Histories ◽

10.1525/fmh.2020.6.4.183 ◽

2020 ◽

Vol 6 (4) ◽

pp. 183-210

Author(s):

Erin Nunoda

Keyword(s):

Public Sphere ◽

Digital Images ◽

Empty Space ◽

The Public ◽

Youtube Videos ◽

The Public Sphere

This article examines YouTube videos (primarily distributed by a user named Cecil Robert) that document so-called dead malls: unpopulated, unproductive, but not necessarily demolished consumerist sites that have proliferated in the wake of the 2008 recession. These works link digital images of mall interiors with pop-song remixes so as to re-create the experience of hearing a track while standing within the empty space; manipulating the songs’ audio frequencies heightens echo effects and fosters an impression of ghostly dislocation. This article argues that these videos locate a potentiality in abandoned mall spaces for the exploration of queer (non)relations. It suggests that the videos’ emphasis on lonely, unconsummated intimacies questions circuitous visions of the public sphere, participatory dynamics online, and the presumably conservative biopolitics (both at its height and in its memorialization) of mall architecture.

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