Image Enhancement and Thresholding for Ancient Inscriptions in Trowulan Museum's Collection Mojokerto, Indonesia

Imam Yuadi, Yunus Abdul Halim, Agustian Taufiq Asyhari, Khoirun Nisa, Nisak Ummi Nazikhah, Ullin Nihaya

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearch

Abstract

Inscriptions are an important source of information that supports archaeological and historical research. However, several significant challenges are due to surface damage, fading, and environmental wear, which often obscure the legibility of inscriptions and interfere with the identification process. This research aims to improve the readability of ancient inscriptions in the Trowulan Museum collection, in Mojokerto, Indonesia, by applying several image processing techniques. Grayscale and Contrast Limited Adaptive Histogram Equalization (CLAHE) methods are applied to improve image quality. Next, four types of thresholding methods including Niblack, Otsu, Sauvola, and Phansalkar were compared to produce the clearest image. Based on the results of calculating the mean, standard deviation, SNR, and PSNR, this research shows that the sauvola method produces brighter and clearer images with the least noise, but has the potential to lose writing identified as noise. On the other hand, the Phansalkar method, with a mean of 200.536, a standard deviation of 104.509, an SNR value of 1.585 dB, and a PSNR value of 6.188 dB, emerges as a viable alternative for preserving fine details in text that are often identified as noise by other methods.

Original languageEnglish
Title of host publicationThe 7th IC2IE 2024 (The Seven 2024 International Conference of Computer and Informatics Engineering)
EditorsAsep Taufik Muharram, Mira Rosalina, Dewi Kurniawati, Susana Dwi Yulianti
Place of PublicationPiscataway NJ USA
PublisherIEEE, Institute of Electrical and Electronics Engineers
Pages52-57
Number of pages6
ISBN (Electronic)9798331505530
ISBN (Print)9798331505547
DOIs
Publication statusPublished - 2024
EventInternational Conference of Computer and Informatics Engineering 2024 - Hybrid, Bali, Indonesia
Duration: 12 Sept 202413 Sept 2024
Conference number: 7th
https://ieeexplore.ieee.org/xpl/conhome/10747781/proceeding (published proceedings)
https://ic2ie.org/ (Website)

Conference

ConferenceInternational Conference of Computer and Informatics Engineering 2024
Abbreviated titleIC2IE 2024
Country/TerritoryIndonesia
CityBali
Period12/09/2413/09/24
Internet address

Keywords

  • ancient inscriptions
  • contrast limited adaptive histogram equalization
  • cultural heritage
  • image processing
  • threshold

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