Impact of contrast modification on human feeling: an objective and subjective assessment

Detecting influence of digital image contrast modification in subjective opinion

“…The proposed approach exploits the blind contrast modification detector developed in [10]. This forensic tool, is based on a set of features collected from the potentially tampered image.…”

“…The starting point of the proposed work is the result collected by the subjective experiments carried out in [10] in which original and modified image pairs were presented to the subjects who were asked to assess the feeling conveyed by the modified image with respect to the original one. Each subject was asked to rank the feeling of the difference with a score in the range [1 − 5] ('1' very negative, -'5' very positive).…”

“…The first step in this analysis is the blind detection of image contrast modification. Few methods are available as in [9] or in [10]. Specifically, in [10], it has been proposed a forensic tool for performing a blind detection of contrast modifications and, based on the results collected by subjective tests, to correlate these alteration with the impact on the viewer.…”

“…Few methods are available as in [9] or in [10]. Specifically, in [10], it has been proposed a forensic tool for performing a blind detection of contrast modifications and, based on the results collected by subjective tests, to correlate these alteration with the impact on the viewer. Here we go further in analyzing the effects of contrast modification by investigating the impact of this modification on people opinion.…”

Information extraction from multimedia web documents: an open-source platform and testbed

“…For example in a news report of a demonstration, the anger of the demonstrators may be emphasised by including an appropriate image, or the pleasure of the recipient of an Oscar emphasised by a closeup of the beaming winner. Some analysis of images in documents can provide additional evidence for opinions extracted from the text and in some cases may provide evidence, not obvious from the text, of attempts to unfairly influence the response of the reader [6,55]. A wellknown example was the augmenting of a war zone image to make the smoke and fire more intense than appearing in the original.…”