Vladimir Rajović

Signal acquisition and processing in the magnetic defectoscopy of steel wire ropes

The system that resolves the problem of wire rope defects using magnetic method of inspection is presented. Implementation of the system should provide for full monitoring of wire rope condition, according to the prescribed international standards. The purpose of this system, except to identify defects in the rope, is to determine to what extent the damage has been done. The measurement procedure provides for a better understanding of the defects that occur, as well as the rejection criteria of used ropes, that way increasing their security. Hardware and software design of appliance for recording defects and test results are presented in this paper.

Hardware realization of inverse subband transformer with minimum used resources

State-of-the-art inverse subband transformer implementations employ significant amount of memory resources for the realization of synchronization memory banks between different levels of the composition. This paper presents a hardware realization of inverse subband transformer without synchronization memory banks between different levels of the composition. Such realization achieves significant savings in both memory and logic resources. The proposed realization also provides significant savings in time resources due to a minimum delay which inverse subband transformer introduces into an image decompression system.State-of-the-art direct subband transformer implementations employ significant amount of memory resources for the realization of synchronization memory banks between different levels of the decomposition. This paper presents a hardware realization of direct subband transformer without synchronization memory banks between different levels of the decomposition. Such realization achieves significant savings in both memory and logic resources. The proposed realization also provides significant savings in time resources due to a minimum delay which direct subband transformer introduces into an image compression system.

An image codec with minimum memory size

State-of-the-art image compression methods with high compression ratio are time consuming and require complex processors and large memory with huge bus bandwidth. This paper presents novel method for significantly minimizing required memory size and increasing the encoding and decoding speed. This solution utilizes order(s) of magnitude less system resources (processor complexity, memory size, consumed power and bus bandwidth) versus state-of-the-art methods.

Hardware realization of fast image encoder with minimum memory size

We approached the problem of hardware realization of an image encoder which minimizes the required memory resources, is fast and has a high compression ratio. It is shown that, using various improvements and novelties, it is possible to implement entire color image encoder within a low cost programmable logic device with no external memory components.

The capacitive divider power supply and its design problem

Capacitive divider power supply is a well-known circuit. Still, it has not been paid attention to among researchers and is still lacking a thorough analysis and referred optimal design guidelines. We give the formal time-domain equations describing the behavior of the supply, as well as the estimation for the circuits dissipation, that will be used as a foundation for a further research.

High-Performance 1-D and 2-D Inverse DWT 5/3 Filter Architectures for Efficient Hardware Implementation

This paper presents high-performance and memory-efficient hardware architectures for one-dimensional (1-D) and two-dimensional (2-D) inverse discrete wavelet transform (DWT) 5/3 filters. The proposed 1-D filter architecture requires 33% less memory resources and 17% less logic resources than the best state-of-the-art solutions. The proposed 1-D filter architecture has 100% hardware utilization, which is defined as the ratio of the actual computation time to the total processing time, both expressed in numbers of clock cycles. It allows a 7% higher operational frequency and simultaneously has the lowest total power dissipation in comparison with the best state-of-the-art solutions. The proposed 2-D inverse DWT 5/3 architecture, based on the proposed 1-D inverse DWT filter design, provides medium total computing time and output latency, but outperforms the best state-of-the-art solutions for at least 20% in terms of required memory capacity.

Efficient one-dimensional forward and inverse discrete wavelet transformers

Abstract This paper describes the efficient one-dimensional forward and inverse discrete wavelet transformers with 5/3 filter. This design reuses the same registers for both low-pass and high-pass filtering in different time slots. It utilizes 33% less registers, 17% less logic elements, has 7% higher maximum operating frequency and 2% lower total power dissipation than state-of-the-art filters.

Efficient inverse discrete wavelet transformer

This paper describes the efficient one-dimensional inverse discrete wavelet transformer with 5/3 filter. The described design makes use of the same registers for both low-pass and high-pass filtering in different time slots. The design utilizes 33% less registers, 17% less logic elements, has 7% higher maximum operating frequency and 2% lower total power dissipation than state-of-the-art filters.

Efficient forward discrete wavelet transformer

This paper describes the efficient one-dimensional forward discrete wavelet transformer with 5/3 filter. This design reuses the same registers for both low-pass and high-pass filtering in different time slots. It utilizes 33% less registers, 17% less logic elements, has 7% higher maximum operating frequency and 2% lower total power dissipation than state-of-the-art filters.

Ten axis MEMS as a position sensor

Analysis of ten axis MEMS as a position sensor is given in the paper. Two Kalman filters for fusion of signals from multiple sensors are synthesized. Filter parameters have been optimized using Particle Swarm optimization. Presented are the results of static and dynamic test.