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The voltage mirroring technique implemented with MOS transistors that exhibits performance of nonfloating linear resistive element is presented. It comprises only three MOS transistors: two of them are enhancement type and the third is depletion type MOS transistor. The possibilities of controlling the variable resistance (tunability) are presented and simulation results are given. One substantial...
The main advantages of the new proposed CMOS active resistor are the improved linearity, the small area consumption and the improved frequency response. An original technique for linearizing the I(V) characteristic of the active resistor is proposed, based on the utilization of a new linear differential amplifier and on a current-pass circuit. The linearization of the original differential structure...
In this article, a novel 10-bit two-step flash A/D converter architecture based on the threshold inverter quantization technique, TIQ is presented. The simulation results include 1.5V analog input range, 30 MHz input bandwidth, and 250 mWatts of power consumption at maximum sampling rate of 500 Ms/s. The process parameter and temperature variation analysis of the converter is especially included....
The article describes a concept of the evaluation board based on a simple single chip microcontroller (mainly Atmel AT89C51CC03). It was developed especially for teaching purposes. The concept consists of main board and supplementary modules. This contributes to the flexibility of the whole system. We try to make labs more efficient and attractive. The mobile platform has been involved into a semestral...
Microcontrollers in dedicated systems were mainly limited to server solutions that provided a semiautomated control of a system. As the 20th century rolled to an end, systems became increasingly complex; integrating different technologies. At the same time, microprocessors became more and more a commodity tool instead of a component in an expensive machine. In this paper, we describe the impact of...
Computer integrated laboratory for analogue electronics was developed. This paper presents analysis of specific linear electronic circuits, such as differential amplifier, oscillator, operational amplifier, power amplifier, full-wave rectifier and stabilizer with series transistor. All analysis are performed using virtual instruments implemented using personal computer acquisition card and LABVIEW...
The paper contains a description of control method for single-phase shunt active power filter, based on the control with DSP TMS320LF2407 for reference signal estimation, and hysteresis current control. Filter, based on half-bridged schematic and control by the proposed method, is simulated and experimentally studied
Discrete wavelet transform (DWT) became a powerful method for signal processing in the last decade. One of the most important applications of this tool is compression, for the bi-dimensional signals JPEG 2000 being an example. Although the new standard offers better results than the old one, new innovating ideas can improve even the JPEG 2000. One idea is to use complex wavelet transforms, transforms...
This paper presents a paralleled two-pass hexagonal (TPA) algorithm constituted by linear hashtable motion estimation algorithm (LHMEA) and hexagonal search (HEXBS) for motion estimation. In the TPA, motion vectors (MV) are generated from the first-pass LHMEA and are used as predictors for second-pass HEXBS motion estimation, which only searches a small number of macroblocks (MBs). We introduced hashtable...
In this paper we propose an iterative algorithm, based on modeling of the degradation system, for reducing coding distortions in wavelet-based compressed images. The proposed algorithm iteratively reconstructs the degraded image. In every step of the iteration, image enhancement processes are implemented dependent of the image content. The performance of the proposed algorithm is evaluated experimentally
The aim of this paper is to compare the quality of digitized chest X-ray images with digitally captured chest X-ray images in children with lung tuberculosis (TB), compressed using popular JPEG and JPEG2000 compression algorithms, for further electronic correspondence. All images were compressed using JPEG and JPEG2000 compression algorithms with six different compression degrees (3 bpp, 1.5 bpp,...
Recently, many efficient image compression methods have been developed in order to compress image data prior to further processing. Discrete cosine transforms and wavelet transforms are examples of these compression methods. The aim of the work presented within this paper is to introduce comparison criteria for optimum compression using these well known image compression techniques. The comparison...
In this paper, a new robust image watermarking technique adopting an optimum encoding framework is proposed. This technique namely, the twin image watermarking algorithm TIWA, utilizes a particular kind of optimum two dimensional codes, based on complete complementary codes, for the introduced watermark encoding process. The TIWA algorithm is first presented for single user, then supported with the...
The current paper proposes a robust watermarking method for still images that embeds a binary watermark into the detail subbands of the image wavelet transform. The perceptually significant coefficients are selected for each subband using a different threshold. The threshold is computed based on the statistical analysis of the wavelet coefficients. For greater invisibility of the mark, the approximation...
In order to increase security of the blind watermarking schemes for image authentication it is desirable to use image-dependent keys in the process of watermark generation. In this paper we propose a new watermarking method for image authentication where the watermark is generated using the image hash as a key. The robust image hash, invariant to legitimate modifications, but fragile to illegitimate...
We propose a new algorithm to analyze cell migration. Sequences of frames are automatically recorded from standard (unmarked) cell cultures by means of phase-contrast microscopes equiped with video acquisition systems. This algorithm is able to automatically follow the locations in the reverse time of many cells during sequences covering relatively long periods of time such as 1 to 3 days. We then...
In this paper we propose a 3D filter for denoising and enhancing strongly oriented data. Our approach is based on 2D directional diffusion model proposed by Terebes et al. (2004). The diffusion process is modulated by a non-linear function depending on the absolute values of the directional derivatives in the 3 orthogonal directions of the space. These directions are the eigenvectors of a structure...
A new neural network adaptive switching median (NASM) filter is proposed to remove salt-and-pepper impulse noise from highly corrupted image. The algorithm is developed by combining advantages of the known progressive median filter with impulse detection scheme. Neural network was included into impulse detection step to improve its characteristics. Comparison of the given method with traditional median-type...
Analysing plant root images is time consuming but very important for ecological, agronomic and biological studies. In this paper we focus on the second of two phases which expands a given part of a root to cover its whole projection in the image extending our fully automatic analysis approach. Employing a hierarchical A* algorithm allows to use a more sophisticated estimation of the occurring remaining...
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