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In this paper a new pupil detection algorithm based on RANSAC procedure is presented. Unlike other similar algorithms reported in the literature, the proposed algorithm provides higher accuracy, low running time and operates properly in noise conditions and for variable illumination. This algorithm is used in the field of assistive technology in order to communicate with neuromotor disabled people...
This paper proposes a new technique that can be used by patients with neuro-motor disabilities to control a PC by means of eye tracking. The technique uses a system that includes an infrared camera and a computer that processes the signals provided by the pupil detection algorithm. The software component is represented by the pupil detection algorithm, which offers information about the cursor position...
The implementation of a hand gesture detection using a stereo camera system is used to determine the hand position in a space described by two intersecting planes and the finger position by determining the finger tips, which leads to the classification of the hand image viewed from above into six different types. The hand movement is simulated using a 3D model implemented in Matlab programming language...
The paper presents the analysis of methods used to implement eye blinking selection in an eye tracking system used in assistive technology for patients with neuro-motor disabilities. The system uses for selection the key words technology or ideograms presented on the user's screen. The method used for blinking detection is based on image segmentation using an adaptive local threshold determined using...
This paper presents an implementation of a binary pulse-position modulator (2-PPM) for impulse-radio ultra-wideband (IR-UWB) systems, capable of producing an appropriate signal to drive the final output stage of an ultra narrow pulse generator. Compared to the usual circuits based on voltage-controlled delay lines, this novel scheme uses digital signal processing of the clock and data signals with...
The paper presents a technique used for the detection of the eye pupil center coordinates by using the least squares approach. The algorithm realizes the fitting of the ellipse to a group of input data points provided by the eye image collected using a video camera in infrared illumination. The method can be used in the area of assistive technology to implement an eye tracking system used to communicate...
The purpose of this paper is to compare two established threshold selection methods used for eye image segmentation: quantitative fixed threshold and Kittler minimum error threshold with a new one based on characteristic selection adaptive threshold. This method relies on identifying the characteristic that describes the pixels that belong to the eye pupil. The results are obtained by using as reference...
A new CMOS differential current-mode AGC on the division operation based is presented. The operation principle consists in detection of both positive and negative envelopes of the differential input signal cycles, respectively. The output signal with constant magnitude is obtained by dividing the differential input signal to the difference between the positive and negative detected envelopes. The...
This paper presents the implementation of an eye-tracking device based on the circular Hough transform algorithm. The proposed device is a part of a complex integrated system for assistance in communicating with and telemonitoring severe neuromotor disabled patients, which consists of an infrared video camera and a PC used to process the captured signals. The eye-tracker device that we have implemented...
The paper describes a software application running on Android mobile devices, used to help the neuromotor disabled patients to communicate with the clinicians or caretakers. The proposed application also include a telemonitoring (remote monitoring) component used to collect and process few physiological parameters of the patient. The application is part of a more complex communication and monitoring...
The paper presents a software application which implements a dialog between neuromotor disabled patients and clinicians. The patient can't speak normally, but he can manifest his intention by moving a finger or other body part which can be translated into a mouse click. The software application reads the mouse click and builds a message for the nurse or other clinician from that hospital. The nurse...
The paper presents a simple procedure used for measuring and sorting RF coils using a sinusoidal signal generated by a frequency synthesizer. The sinusoidal signal is applied to a circuit made up of coils with unknown inductance and a capacitor with known value. By measuring the resonance frequency and the level of the envelope, one can calculate the inductance and the quality factor. As the frequency...
The purpose of this study is to highlight the dynamic relationship between the cardiotocographic signals: intrapartum fetal heart rate and uterine pressure, for normal and hypoxic fetuses. The database used in our study contains 531 normal or abnormal recordings (abnormal recordings are considered those with pH value under 7.15). We have used the partial directed coherence (PDC) method to obtain the...
In this paper are presented several techniques used for improving the pupil detection algorithm based on a head mounted eye tracking system employing an infrared video camera. The coordinates of the eye pupil center obtained by any eye tracker device are affected by many noise sources. In order to improve the pupil detection position, several different techniques of real time filtering and high frequency...
This article presents a simple and inexpensive method for measuring and sorting RF coils at their operating frequency or very close to it. The process is based on the injection of a linear variable frequency constant current in a circuit consisting of an identified value capacitor and the coil under test. The range of frequencies includes the working frequency of the measured coil. The resonant circuit...
This paper presents a robust technique for pupil center coordinates detection that uses the circular Hough transform technique. The algorithm of the proposed application is based on detecting the circle which represents the pupil edge from a set of eye images captured using an infrared camera which employs the dark-pupil technique. The accuracy of the pupil detection algorithm is evaluated on the...
This paper presents a software application which helps the neuromotor disabled patients to communicate with the clinicians. The proposed system also includes a telemonitoring component which collects the signals corresponding to various patients' physiologic parameters. Due to their affections, the patients can't speak or write but they can manifest their intentions toggling a switch, using a finger...
The paper presents a VLSI implementation of a frequency synthesizer based on a charge pump PLL. Indirect synthesis uses a Phase Lock Loop (PLL) architecture with a programmable frequency divider in the loop, providing a large number of frequencies from a single reference frequency. The proposed frequency synthesizer is designed for Short Range Device (SRD) applications around 433MHz and for FM radio...
In this paper, solutions to improve the stability and time response for head mounted eye tracking system are presented. The detection of eye pupil centre coordinates is affected by noise due to physiologic eye tremor, noisy images and the algorithm used for pupil detection. That leads to unstable point of gaze detection, affecting the eye tracking precision. Treating pupil centre coordinates as two...
This paper presents a new CMOS differential input FM quadrature demodulator for integrated circuits. The proposed circuit is based on Bilotti's quadrature demodulator that uses an external differential phase shift network and a differential phase detector with a single ended output. The phase detector is represented by an analog multiplier implemented with a Gilbert cell and the phase shift network...
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