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0. Complete issue
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- 1. Evaluation of single and multi-threshold entropybased algorithms for folded substrate analysis
- Pages: 1-9
- Magdolna Apro, Szabolcs Pal, Sandra Dedijer
- Abstract | Download
Abstract
This paper presents a detailed evaluation of two variants of Maximum Entropy image segmentation algorithm
(single and multi-thresholding) with respect to their performance on segmenting test images showing folded substrates.
The segmentation quality was determined by evaluating values of four different measures: misclassification
error, modified Hausdorff distance, relative foreground area error and positive-negative false detection ratio. New
normalization methods were proposed in order to combine all parameters into a unique algorithm evaluation rating.
The segmentation algorithms were tested on images obtained by three different digitalisation methods covering
four different surface textures. In addition, the methods were also tested on three images presenting a perfect fold.
The obtained results showed that Multi-Maximum Entropy algorithm is better suited for the analysis of images
showing folded substrates.
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2. Comparison of durability between UV inkjet and conventional offset prints exposed to accelerated ageing
- Pages: 10-15
- Mirica Karlovits, Diana Gregor-Svetec
- Abstract | Download
Abstract
The present study deals with the optical and colour stability of aged offset and UV inkjet prints. As a paper substrate,
a film synthetic paper was used, which was printed by two techniques (UV inkjet press Óce Arizona 250® GT and
conventional offset press KBA Performa 74). Film synthetic paper, offset prints and UV inkjet prints were artificially
aged using standard techniques of accelerated ageing, such as moist-heat (80 °C and 65% relative humidity)
and dry-heat (105 °C). Ageing was performed for periods of 1, 2, 3, 6 and 12 days. It was found that the moist-heat
accelerated ageing influenced the most on optical properties of film synthetic paper. UV inkjet prints had higher
colourfastness than the conventional offset prints. The most stable among all tested prints was the black colour UV
inkjet print.
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3. Measurement uncertainty in colour characterization of printed textile materials
- Pages: 16-25
- Neda Milić, Dragoljub Novaković, Nemanja Kašiković
- Abstract | Download
Abstract
The subject of uncertainty of spectrophotometric measurement of printed textile materials is one of the major
unsolved technical problems in textile colourimetry today. Textile manufacturers are often trying to maintain colour
difference tolerances which are within the range or even less than the uncertainty of the measurement system
controlling them. In this paper, two commercial spectrophotometers with different measuring geometries (GretagMacbeth
Eye-One Pro with 450/0° geometry and ChinSpec HP200 with d/8° geometry) were comparatively
investigated in terms of measurement uncertainty in colour characterization of textile products. Results of the study
indicate that, the despite of different measuring geometry, instruments had the similar measurement repeatability
behaviour (repeatability of readings from different parts of the same sample) in the case of used digitally printed
polyester materials. The important influence on measurement variability had the material preparation method (were
the materials triple folded, placed on a black backing or a white backing). On the other hand, instruments showed
difference concerning the inter-model agreement. Although this difference was not confirmed as significant with
visual assessment, observers evaluated the measurement readings from the Eye-One Pro spectrophotometer as more
accurate colour appearance characterization of textile materials.
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- 4. Possibility of using cardboard mill sludge in remediation of contaminated sediment
- Pages: 25-32
- Miljana Prica, Milena Dalmacija, Božo Dalmacija, Jelena Tricković, Rastko Milošević
- Abstract | Download
Abstract
The sludge from cardboard mill is commonly landfilled, but it could be recycled into production on-site or reused in
some other way. In this study the use of sludge from cardboard mill as stabilizing agent in the solidification/stabilization
(S/S) treatment of lead polluted sediment was examined. The effectiveness of S/S treatment was evaluated by
determining cumulative percentage of lead leached and by applying different leaching tests. Applied S/S treatment
was effective in immobilizing lead irrespective of high concentration in the untreated sample.
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