Technical Journal, Vol. 8 No. 1, 2014.
Original scientific paper
Image noise and tone transfer function of imaging systems
Ivana Čirjak
Damir Modrić
orcid.org/0000-0002-0110-2952
; Sveučilište u Zagrebu, Grafički fakultet, Zagreb
Dean Valdec
orcid.org/0000-0001-6897-8601
; Sveučilište Sjever, Sveučilišni centar Varaždin, Varaždin
Abstract
During reproduction and creation of an image comes to the expected error when transferring information from one reproduction system to another. This error is called reproduction noise, resulting in a very reproductive system. This paper examines the phenomenon of noise in the reproduction of the printed materials and the correlation between the tonal values of the original pixel density and opacity playing for several personal printers. In this paper is used a sample tone scale (Kodak Gray Scale) and is reproduced on three different printers. Tonal value of each pixel in the original file in the reproduction appears as density opacity or reflection. Scanning patterns are translated into digital form, and analyze them with a variety of software tools. It was noted that there is a difference between the input original values and the output reproduction values. It was noted that there is a difference between the input and output values of the original values in the reproduction, which indicates that it is possible to reconstruct the TTF (Tone Transfer Function, transfer function tones) of each used device. It is TTF that is necessary to understand the noise modes, that appears as expected error and to optimize reproductive system.
Keywords
noise; TTF; histogram; gray scale; the reproductive system
Hrčak ID:
120068
URI
Publication date:
15.3.2014.
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