Watermarking Competency Certificates with Value Images Using the Descrete Cosine Transform (DCT) Method
Keywords:
Watemarking, Competency Certificates , Value Images , Descrete Cosine Transform (DCT) MethodAbstract
Image watermarking is a technique for inserting hidden information into digital images to maintain the authenticity and integrity of documents. This study discusses the application of the Discrete Cosine Transform (DCT) method in the watermarking process on the value image stated in the Competency certificate. The DCT method allows the insertion of watermarks on the image's frequency domain, where information can be embedded without compromising the visual quality of the certificate. This implementation aims to ensure that certificates remain authentic and not easily manipulated. The embedding process is carried out by inserting a watermark on a high-frequency component that is invisible to the human eye, while the extraction process is used to verify the authenticity of the certificate. The results show that the DCT method provides reliable protection against image modification, as well as maintains the validity and security of data integrated in the competency certificate digitally.
References
Andreansyah, R. D., Maulan, C. R., & Putri, F. Y. (2022). Professional Dalam Graphic Design. uwais inspirasi indonesia.
Bismark, D. G., Budiman, G., & Ramatryana, I. N. A. (2016). Analisis Dan Implementasi Image Watermarking Menggunakan Metode Multiple Scanning Diffrence Value Histogram. eProceedings of Engineering, 3(1).
Dasopang, M. (2015). Metode Perancangan Pengarangkat Lunak Mereduksi Noise Citra Digital Menggunakan Contraharmonic Mean Filtter. JURIKOM (Jurnal Riset Komputer), 2(6).
Fauzi, J. R. (2023). Algoritma dan Flowchart Dalam Menyelesaikan Suatu Masalah. Jurnal Hukum Progresif.
Firliansyah, A., Fauzi, A., & Sembiring, H. (2023). Watermarking Qr Code Application On Birth Certificates Using The Discrete Cosine Transform (Dct) Method. Indonesian Journal of Education And Computer Science, 1(2), 56-65.
Halawa, E., & Purba, S. (2023). Aplikasi Watermarking Dengan Metode Discrete Cosine Transform (Dct). Jurnal Sains dan Teknologi ISTP, 18(2), 142-148.
Mangaras, Y. F., Bambang Yuwono, B. Y., & Dessyanto, B. P. (2022). Dasar Pengolahan Citra Digital.
Merry, A. (2022). WATERMARKING DENGAN METODE DISCRETE COSINE TRANSFORM (DCT) UNTUK MENJAGA KEAMANAN CITRA DIGITAL. WATERMARKING DENGAN METODE DISCRETE COSINE TRANSFORM (DCT) UNTUK MENJAGA KEAMANAN CITRA DIGITAL.
Putra, Darma. 2010. 1 Pengolahan Citra Digital. 1st ed. ed. Westriningsih. Yogyakarta: CV Andi Offset.https://www.google.co.id/books/edition/Pengolahan_Citra_Digital/N ectMutqX AC?hl=id&gbpv=0 (May 17, 2023).
Refialy, L. P. (2020). Self Embedding Watermarking pada Citra Digital. Journal Information System Development (ISD), 5(2).
Salamah, Ummy Gusti, and Risma Ekawati. 2021. 1 Pengolahan Citra Digital. 1st ed. Jawa Barat: CV. Media Sains Indonesia.
Setiawan, I. B., Pramukti, L. F., & Hidayat, A. T. (2023). Algoritma Discrete Cosine Transform (Dct) Untuk Pengamanan Citra Digital Dengan Otp Berbasis Web. Jurnal Komputer Dan Teknologi, 2(1), 18-26.
Sipayung, W. (2014). Perancangan Citra Watermaking Pada Citra Digital Menggunakan Metode Discrete Cosine Transform (DCT). Pelita Inform. Budi Darma, 7(3), 104-107.
Situmorang, I. (2018). Implementasi Watermark Pada Citra Menggunakan Metode Spread Spectrum. Jurnal Teknik Informatika UNIKA Santo Thomas, 3(2), 83-89..
Tjolleng, A. (2017). Pengantar Pemrograman Matlab. Elex Media Komputindo. Offset. https://books.google.co.id/books?hl=en&lr=&id=_eI8DwAAQBAJ&oi=fnd &pg=PP1& dq=Pengantar+Pemrograman+Matlab&ots=odlvejTQlS&sig=RPapYMFyL OaIT_9GIICN8U6BdNk&redir_esc=y#v=onepage&q=Pengantar%20Pemro graman%20Matlab&f =false
