Edge spread function for the paper-ink system

Abstract

<jats:title>Abstract</jats:title> <jats:p>The importance of accurate identification of the edge spread function for the paper-ink system is closely related with the possibility of separating mechanical and optical dot gain. Our approach is based on the precise fit of the edge spread function, ESF. Namely, all of the research so far incorporates symmetric ESF, in contrast to the research reported so far, in which only the symmetric ESF has been considered¸ which is not realistic, due to the presence of dot gain. This approach, based on image analysis, allows us to identify uniquely the domain of impact of each contribution. Six different paper-ink systems are analyzed and discussed, and all of them show a satisfactory correlation with the proposed model.</jats:p>

Enhancing Applicability of Reversible UV Thermochromic Offset Inks: Edge Quality Parameters and Thermochromic Printing System Modulation Transfer Function

“…The maximum reflectance value (a 2 ) corresponding to paper reflectance is from 97 to almost 100%, while the minimum values for conventional printed edges show identical values. In our previous research that examined the ratio of mechanical dot gain in the overall dot gain of electrophotographic prints with dry toner, it was observed that mechanical dot gain is the more dominant phase with a share of 70-75%, while the remaining part corresponds to optical dot gain [47]. Similar results can be confirmed in the case of both thermochromic and conventional dry offset prints for horizontal edges (75-77%).…”

“…MTFs were generated according to the procedure previously published by Itrić et al [47]. Reflectance spectra were further processed in Origin 9.5. software.…”

Development of non‐contact foreign body imaging base on photoacoustic signal intensity measurement

“…To calculate the spatial resolution of the imaging system image, the equation is used $$$$\begin{equation}ESF\left( x \right) = \frac{1}{2} + \frac{1}{\pi }{\tan ^{ - 1}}\left( {\lambda \left( {x - {x_0}} \right)} \right)\end{equation}$$$$where x , x 0 , and λ are the pixel position, curve centre position, and fitting parameter variables, respectively 37,38 . The ESF is then derived into the LSF equation and the spatial resolution of an image can be calculated from the Full‐Width Half Maximum (FWHM) of the LSF curve by the equation $$$$\begin{equation}LSF\left( x \right) = \frac{{{\lambda \mathord{\left/ {\vphantom {\lambda \pi }} \right.$$…”

“…To calculate the spatial resolution of the imaging system image, the equation is used where x , x 0 , and λ are the pixel position, curve centre position, and fitting parameter variables, respectively. 37 , 38 The ESF is then derived into the LSF equation and the spatial resolution of an image can be calculated from the Full‐Width Half Maximum (FWHM) of the LSF curve by the equation …”

The Possibility of Increasing the Achromatic Tone Values of FOGRA 51 Standards Achieved by the Modification of in Line Pre-Treatment of the Printing Substrate

“…The second parameter that significantly influences the photo quality is precise (shape and dimension) printing of screen elements (controlled dot gain). Additional quality improvement can be achieved by choice of paper type, while optical component of dot gain depends solely on it [21]. It can be controlled directly by the change of the laser power and by adjusting the ink layer by changing the voltage at BID's units [22][23][24].…”