Visual quality indices and lowquality images

Author(s):  
Heinz Hofbauer ◽  
Andreas Uhl
2012 ◽  
Vol 1 (3) ◽  
pp. 148 ◽  
Author(s):  
Helen Manolopoulou ◽  
Gregory Lambrinos ◽  
George Xanthopoulos

<p>Fresh-cut green bell peppers (<em>Capsicum annuum L.</em>) were stored in modified atmosphere packaging (MAP) made of impermeable high-density polyethylene film. Two in-packaging atmospheres and storage temperatures (0 <sup>o</sup>C and 5 <sup>o</sup>C) were tested. The respiration rate of the unpackaged produce and the in-package gas concentration, mass loss, firmness, skin colour, ascorbic acid and visual quality of the packaged produce were estimated. Cutting, increased respiration rate of the unpackaged produce by 24% compared to the intact produce for the same storage temperature. After 5 days of storage at 5 °C, significant O<sub>2</sub> depletion of the active modified atmosphere was found. Limited mass loss (0.4-0.5% of the initial mass) and firmness degradation were estimated in both storage temperatures due to the beneficial effect of packaging. The hue angle (h*) reduction was limited in all cases and the initial green colour was preserved. Initial ascorbic acid content was preserved at 0 °C, but significantly increased at 5 °C. The visual quality of the packaged produce was assessed by six trained panelists and found that was not significantly changed at 0 °C storage. In conclusion, the tested active MAP maintained the initial quality indices of fresh-cut peppers (<em>cv.</em> <em>Twingo F1</em>) for up to 10 days at 0 °C but not at 5 °C.</p>


2019 ◽  
pp. 36-39
Author(s):  
V.J. Chernykh ◽  
◽  
V.V. Martirosyan ◽  
V.D. Malkina ◽  
T.I. Kryachko ◽  
...  
Keyword(s):  

Author(s):  
Kateryna Iorgachova ◽  
Olga Makarova ◽  
Karyne Avetisian

In the presented work the choice of starch syrup for the jelly products production has been substantiated. It was based on the analysis of the starch syrup carbohydrate profiles and recipes of jelly products. The influence of syrup on the rheological and structural-mechanical properties of jelly and aerated masses for a two-layer jelly has been determined. The expediency of polydextrose usage has been demonstrated. Its adding leads to the regulation of the jelly structure and foam layer for the samples with more than 50% of sugar replaced by starch syrup. Depending on the ratio of carbohydrates in jelly it was determined the amount of polydextrose adding of which provides the required firming and prebiotic properties of finish products. The change of physical-chemical, structural-mechanical, and organoleptic quality indices of two-layer jelly with modified carbohydrate composition has been investigated during storage.


2013 ◽  
Vol E96.B (12) ◽  
pp. 3181-3189 ◽  
Author(s):  
Inwoong LEE ◽  
Jincheol PARK ◽  
Seonghyun KIM ◽  
Taegeun OH ◽  
Sanghoon LEE

2020 ◽  
Vol 2020 (4) ◽  
pp. 76-1-76-7
Author(s):  
Swaroop Shankar Prasad ◽  
Ofer Hadar ◽  
Ilia Polian

Image steganography can have legitimate uses, for example, augmenting an image with a watermark for copyright reasons, but can also be utilized for malicious purposes. We investigate the detection of malicious steganography using neural networkbased classification when images are transmitted through a noisy channel. Noise makes detection harder because the classifier must not only detect perturbations in the image but also decide whether they are due to the malicious steganographic modifications or due to natural noise. Our results show that reliable detection is possible even for state-of-the-art steganographic algorithms that insert stego bits not affecting an image’s visual quality. The detection accuracy is high (above 85%) if the payload, or the amount of the steganographic content in an image, exceeds a certain threshold. At the same time, noise critically affects the steganographic information being transmitted, both through desynchronization (destruction of information which bits of the image contain steganographic information) and by flipping these bits themselves. This will force the adversary to use a redundant encoding with a substantial number of error-correction bits for reliable transmission, making detection feasible even for small payloads.


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