APPLICATION OF DIGITAL FILTERING FOR IMAGES

UDC 004.932.2

 

Sulim Pavel Yevgen’yevich – PhD (Engineering), Senior Lecturer, the Department of Printing Equipment and Information Processing Systems. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: sulim@belstu.by

 

DOI: https://doi.org/ 10.52065/2520-6729-2023-273-2-4 (In Russian).

 

Key words: digital original, risographic printing, linear and non-linear filtering, Matlab

 

For citation: Sulim P. Ye. Application of digital filtering for images. Proceedings of BSTU, issue 4, Printand Mediatechnologies, 2023, no. 2 (273), pp. 26–31. DOI: 10.52065/2520-6729-2023-273-2-4 (In Russian).

Abstract

Today, digital technologies that automate the reproduction of text and graphic information are developing at a rapid pace. Most of the originals entering the printing house are digital layouts. If earlier one of the main criteria for the professional preparation of a publication was the presence of a combination of colors, today great attention is paid to the overall picture: it should be clear and saturated [1–4]. To improve the quality of prints, it is proposed to use the methods of linear and non-linear filtering, as well as methods of screening the original layout, depending on the type of the original image. In this case, the digital layout of the image will be evaluated in terms of contrast, noise and clarity. Further, based on the area of filling the text information of the original layout, the type of image is determined. Next, filtering and adaptive screening of the resulting image is carried out.Obtaining high-quality risographic prints was also carried out by studying and processing the original layout with filters: linear and non-linear. Filters for risographic printing from the Matlab system were analyzed on the basis of experimental studies, and filter mask parameters were calculated using the imfilter and fspecial functions for various types of images. The results of the formation of the original layout using digital filtering are shown in the figures in the work.

 

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References

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24.07.2023