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M.Agus Sunandar
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Computer Science & IT Decision Sciences, Operations Research & Management Industrial & Manufacturing Engineering Mechanical Engineering Other

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IMPLEMENTASI ALGORITMA BARNI SYMMETRIC UNTUK WATERMARKING CITRA DIGITAL Brian Damastu Ridho Hutama; M.Agus Sunandar
Jurnal Teknologika Vol 14 No 2 (2024): Jurnal Teknologika
Publisher : Sekolah Tinggi Teknologi Wastukancana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51132/teknologika.v14i2.438

Abstract

Image watermarking is a solution to protect digital images of issues such as copyright protection, ownership, authentication, fingerprinting, and etc. Digital watermarking method using a symmetric algorithm Barni on digital images with a correlation-based method in the domain of Discrete Cosine Transform (DCT). Color images in RGB color space is transformed first into the YCbCr color space. Watermark is inserted in the array f, then the results are transformed back into RGB color space. Watermark is the real line and along the N elements are normally distributed. Watermark is inserted in the selected DCT coefficients of middle frequency sub-band to get a balance between robustness and imperceptibility. Watermark detection is done by calculating the correlation between the received image with the original watermark, and then compare it with an-value threshold. The test results are binary decision stating the image contains a watermark or not contain the watermark. The experimental results show that air-quality image watermark can not be distinguished from the original image and Barni symmetric method has proven robust against some non-malicious attacks such as JPEG compression attack, histogram equalization, gamma correction, noising, sharpening
Sistem Monitoring Parameter Listrik Tiga Fasa Berbasis IoT Dengan Data Logger Untuk Meningkatkan Efisiensi Energi Singasatia, Dayan; Minarto; M.Agus Sunandar
Jurnal Teknologika Vol 15 No 1 (2025): Jurnal Teknologika
Publisher : Sekolah Tinggi Teknologi Wastukancana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51132/teknologika.v15i1.461

Abstract

Penggunaan energi listrik yang efisien dan efektif menjadi sangat penting dalam beberapa tahun terakhir. Listrik sistem tiga fasa memerlukan monitoring yang komprehensif. Dengan meningkatnya kebutuhan energi listrik, pengelolaan energi yang baik menjadi kunci untuk mengurangi biaya dan meningkatkan efisiensi. Sistem monitoring energi listrik tradisional seringkali memiliki keterbatasan dalam hal akurasi dan kecepatan data karena tidak dapat memantau parameter listrik secara real-time sehingga tidak dapat memberikan analisis data untuk mengidentifikasi peluang penghematan energi. Teknologi Internet of Things (IoT) telah memungkinkan pengembangan sistem monitoring energi listrik yang lebih akurat dan dapat diandalkan. Sistem IoT dapat memantau parameter listrik seperti arus, tegangan, daya, dan energi listrik secara real-time.
Co-Authors Brian Damastu Ridho Hutama Dayan Singasatia Minarto