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This paper proposes the use of the combination of digital curvelet transform and local binary patterns for recognizing facial expressions from still images. The curvelet transform is applied to the image of a face at a specific scale and orientation. Local binary patterns are extracted from the selected curvelet sub-bands to form the descriptive feature set of the expressions. The average of the features...
This paper describes the load flow simulation studies of the Western grid of Bangladesh Power System using PSAT, a free and open-source software and compares the results with those from PowerWorld, a well-accepted and commercial software. The studied power system contains 41 buses and 82 interconnecting lines. To ground the basis of comparison, both of the applications were run in the same simulation...
In this paper, we have introduced a new technique based on simultaneous analysis of output voltage gain vs. frequency and phase vs. frequency for fault testing of analog integrated circuits. An automated test frequency generation method is demonstrated here to select minimum number of test frequencies as stimuli. The introduced technique is applied to three benchmark circuits and the obtained results...
We have presented a method for tracking multiple objects in video sequences based on background subtraction and SIFT feature matching where camera is fixed and input video sequences are real time or self captured. Object is detected automatically by background subtraction, then successful tracking is performed by observing the motion and SIFT feature matching of the detected object. Many existing...
Localization and mapping in robotics are preliminary but challenging problems. A learning approach must be followed by a robot to understand its environment and perform data association before it accomplishes any other tasks. In this paper, we describe a novel combination of techniques to map the environmental boundaries traced by the robot and localize it inside the bounded region. This is an effort...
Major functions of ldquoSoftware Defined Radios( SDRs )rdquo are signal processing functions (SPF) and the basic building blocks for most of these functions are multipliers, adders, delays, square roots, trigonometric functions etc.. The SPFs are computationally intensive and they exhibit spatial or temporal parallelism or both. While the high performance DSP processors are unable to meet the speed...
When merging data from various sources, it is often the case that small variations in data format and interpretation cause traditional functional dependencies (FDs) to be violated, without there being an intrinsic violation of semantics. Examples include differing address formats, or different reported latitude/longitudes for a given address. In this paper, we define metric functional dependencies,...
Performance required by "software defined radio (SDR)" poses many challenges in real-time applications because of their high computational complexity and therefore, designing a high performance SDR with high degree of flexibility becomes a major issue. While the fastest programmable DSP processors are unable to meet the speed requirements for SDR, system on chips (SOCs) are also not suitable...
The WiMAX OFDMA environment is unique in that it requires a two-dimensional allocation i.e. simultaneously in time and frequency on the downlink. The downlink resource has to be broken into sub-rectangles, each of which is allocated to one or more flows. In this paper, we have proposed a fast allocation algorithm to allocate the downlink resource to multiple flows while honouring Quality of Service...
Design by contract (DbC) is a methodology to construct quality software. DbC associates the contract specification (pre and postconditions of methods of class and class invariant) with the design of a class. In this paper, we combine dataflow testing and Design by Contract to develop a testing technique called "Data flow testing using Contract". In this technique a class flow graph is generated...
Image inversion techniques revolving around Tikhonov regularization try to use local heuristics to clean the noise and recover the image. We propose a segmentation based inversion algorithm which can recover the structural information in a two-dimensional image data composed of continuous sub-regions with discontinuous and disjoint adjacencies. We present results for different kinds of images with...
Raman microspectroscopy is used for the first time to study chemical and structural transformations in RPE cells exposed to cw and short-pulsed high-intensity light irradiation.
In this paper, we present some results on the use of N- queen sub-sampling lattices for motion estimation in H.264. For MPEG-4, N-queen has been shown to give better results compared to other existing pixel decimation lattices in terms of spatial homogeneity and directional coverage. We aim to develop a generalized algorithm to select an M- length pattern from an N times N block such that the selected...
Constraints imposed on various resources in embedded computing make it a challenging design space. One such important constraint is memory. Proper cache design can overcome this memory bottleneck. In our paper, we propose a methodology for cache design space exploration specific to cryptographic hash functions. The proposed methodology finds a speed-power optimized cache configuration. We also describe...
We address the problem of identifying high throughput paths in 802.11 wireless mesh networks. We introduce an analytical model that accurately captures the 802.11 MAC protocol operation and predicts both throughput and delay of multi-hop flows under changing traffic load or routing decisions. The main idea is to characterize each link by the packet loss probability and by the fraction of busy time...
This paper presents an FPGA based hardware design for full search block matching (FSBM) based motion estimation (ME) in video compression. The significantly higher resolution of HDTV based applications is achieved by using FSBM based ME. The proposed architecture uses a modification of the sum-of-absolute-differences (SAD) computation in FSBM such that the total number of additions/subtraction operations...
In this paper, we suggest a scheme to reduce memory requirement of the full search block matching (FSBM) algorithm. Next, we explore the memory design space of embedded multimedia applications and suggest a speed-energy optimized cache hierarchy.
The objective of this paper is to present the exact solutions for instability control of piezolaminated thin steel sheet struts subjected to static and dynamic axial compressive forces. The electromechanical piezoelectric constitutive law derived by Tiersten is adopted. Solution for the actuation and control is derived from the basic principle of the imperfection approach considering geometric nonlinearity...
After the formation of a distribution company (DISCOM), it takes a lot of initiatives to become a preferred provider of reliable and competitive power to people it serves and a favored company to work for. This work covers the initiatives taken by a DISCOM in different areas like O&M process improvement, commercial process improvement, and customer care process improvement to enhance all the related...
It is well known that periodical poling of ferroelectrics crystals cannot modulate the intrinsic third order nonlinearity. We report that it can however modulate the effective nonlinearity due to cascaded quadratic processes in PPLN crystal.
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