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A 10Gb/s bidirectional wavelength division multiplexing passive optical network (WDM-PON) with reflective semiconductor optical amplifier (RSOA) based colorless optical network unit (ONU) is proposed and analyzed for next generation gigabit class optical access network. Differential phase shift keying (DPSK) modulated signal is used in downstream and further reused as a seeding wavelength for upstream...
Iris recognition system for identity authentication and verification is one of the most precise and accepted biometrics in the world. Portable iris system mostly used in law enforcement applications, has been increasing more rapidly. The portable device, however, requires a narrow-bandwidth communication channel to transmit iris code or iris image. Though a full resolution of iris image is preferred...
At the modern world digital signal processing (DSP) has turned into an enormously vital subject. A fundamental aspect of the digital signal processing is filtering. Filtering is a selective system which passes a certain range of frequency and attenuating the others frequency. Digital filtering is a powerful sector of DSP related works. A digital filter is a system which performs mathematical operations...
This paper presents an efficient noise reduction scheme to remove localized high frequency information from segmented iris region for personal authentication based on radial suppression. Eyelash and eyelids of localized iris area is considered as noisy information. Accuracy of iris recognition system generally depends on accurate segmentation and noise deduction. Proposed method not only removes eyelash...
With a view to managing the increasing traffic in computer networks, round robin arbiter has been proposed to work with packet switching system to have increased speed in providing access and scheduling. Round robin arbiter is a doorway to a particular bus based on request along with equal priority and gives turns to devices connected to it in a cyclic order. Considering the rapid growth in computer...
A digital system frequently requires memory for storage. To facilitate this requirement, FPGAs offer different types of memory, ranging from block RAM, a highly distributed RAM in the form of the multiple LUTs, right down to the storage of data in the flip-flops. However, unlike the conventional RAMs, dynamic random access memory (DRAM) is best suited for larger volumes of memory, because it permits...
This paper presents a novel and robust method for pupil and iris boundary localization based on morphological and geometrical operation. This proposed method localizes the iris and pupil center in several stages. In the proposed algorithm Otsu threshold value, median filter, image complement, contact labeling and manual tracking are used for robust detection of the pupil. Otsu threshold is used for...
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