Mochammad Zuliansyah, Mochammad
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3D Modelling With Linear Approaches Using Geometric Primitives Zuliansyah, Mochammad
Makara Journal of Technology Vol 9, No 1 (2005)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (273.802 KB) | DOI: 10.7454/mst.v9i1.91

Abstract

In this paper, we study linear approaches for 3D model acquisition from non-calibrated images. First, the intrinsic and extrinsic camera calibration is taken into consideration. In particular, we study the use of a specific calibration primitive: the parallelepiped. Parallelepipeds are frequently present in man-made environments and naturally encode the affine structure of the scene. Any information about their euclidean structure (angles or ratios of edge lengths), possibly combined with information about camera parameters is useful to obtain the euclidean reconstruction. We propose an elegant formalism to incorporate such information, in which camera parameters are dual to parallelepiped parameters, i.e. any knowledge about one entity provides constraints on the parameters of the others. Consequently, an image a parallelepiped with known Euclidean structure allows to compute the intrinsic camera parameters, and reciprocally, a calibrated image of a parallelepiped allows to recover its euclidean shape (up to size). On the conceptual level, this duality can be seen as an alternative way to understand camera calibration: usually, calibration is considered to be equivalent to localizing the absolute conic or quadric in an image, whereas here we show that other primitives, such as canonic parallelepipeds, can be used as well. While  the main contributions of this work concern the estimation of camera and parallelepiped parameters. The complete system allows both calibration and 3D model acquisition from a small number of arbitrary images with a reasonable amount of user interaction.
Pergantian Sink pada Jaringan Sensor Nirkabel berbasis ZigBee dengan Prioritas Formasi Tree Zuliansyah, Mochammad; Mutiara, Giva Andriana
InComTech: Jurnal Telekomunikasi dan Komputer Vol 1, No 1 (2009)
Publisher : Department of Electrical Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/incomtech.v1i1.244

Abstract

Perkembangan teknologi wireless akhir-akhir ini semakin pesat, hal ini dibuktikan dengan munculnya suatu teknologi wireless baru yang dikenal dengan ZigBee (IEEE 802.15.4). ZigBee adalah suatu protokol pada jaringan wireless yang dikhususkan untuk perangkat sensor, sehingga hanya memerlukan power dan data rate yang rendah tetapi mempunyai jangkauan yang luas serta tingkat keamanan yang tinggi. Pada umumnya, satu jaringan ZigBee hanya mempunyai satu koordinator yang dinamakan sink. Tetapi dimungkinkan terjadi kondisi bahwa sink tersebut tidak dapat menjalankan fungsinya dengan baik, sehingga harus ditentukan sink baru agar fungsi jaringan dapat dipertahankan. Penelitian ini mencoba menyelesaikan permasalahan yang ada dengan melakukan analisis terhadap algoritma Multi-Tree Construction With The High-Weightfirst Property (MT-HW) dan algoritma Multi-Tree Construction With The Edge-Overlap-First Property (MT-EO) sebagai pembanding. Algoritma yang diusulkan pada penelitian ini disebut dengan Priority Based Sink Assignment (PBSA). Pemodelan jaringan Zigbee (IEEE 802.15.4) menggunakan NS-2 (Network Simulator 2) dalam implementasi topologi tree.