Sayed Muchallil

Improvement of binarization performance by applying DCT as pre-processing procedure

This paper proposes a new pre-processing approach to a sequence of binarization process, by applying the discrete cosine transform (DCT) to document image prior to binarization. This procedure can be used as a complement or alternative to denoising process used in many binarization methods. Firstly, original document images are transformed by the DCT. Then, the transformed document images are passed to standard image binarization methods, namely Otsu, Niblack, Sauvola and NICK. Secondly, original document images are directly binarized by the same methods. Then performance of the latter are compared with that of the former in terms of recall and precision. Performance evaluation are conducted by using noiseless and noisy ancient Indonesian documents with Arabic characters. It turns out that this pre-processing procedure improves binarization performance, especially for noisy documents.

Energy efficiency of mobile peer-to-peer network based on channel condition and bandwidth

Mobile peer-to-peer (P2P) network is a simple computing network in which some of the mobile devices are communicated with peer-to-peer mode through access point. Energy efficiency in mobile P2P is improved by increasing the number of active nodes on the network and reducing the consumed energy by the number of idle nodes. However, if a lot of the number of active nodes perform the transmission process, it can cause interference between stations which could decrease the network performance. Therefore, this paper evaluates the effect of channel condition and bandwidth on mobile P2P networks towards energy efficiency. This can be done by analyzing the relationship between the parameter of channel conditions such as channel quality and network energy consumption. Another parameter that affects the energy efficiency is the availability of bandwidth in the network, which can be obtained by using different modulation types that are BPSK and QPSK. To evaluate the parameters, a model for P2P network is introduced into three different scenarios of information transmission processes. Numerical simulation has carried out using Matlab programming. Simulation results show that energy efficiency is inversely proportional to the quality of the channel, where the high channel quality has small energy efficiency in the network. In addition, QPSK modulation could provide a significant improvement on the energy efficiency for mobile P2P network compared with BPSK modulation.