Suitable Post Processing Research Articles

Integrated region matching approach for tracking target objects in video sequences using HSV colour space

The object tracking is one of the important tasks in computer vision. In this work, an object tracking method is proposed, which use the properties of the HSV colour space for representing the object. The pixels in the objects are transformed either as true colour pixels or grey colour pixels and clusters are formed either as a true colour cluster or as a gray colour cluster. The adaptive K-means clustering is applied for clustering the video frames and a suitable post processing is carried out for obtaining information about all clusters. A suitable similarity measure has been proposed by which the object level similarity between the current frame and next frame are calculated. The performance of the proposed approach is evaluated using bench mark video sequences such as PETS, SPEVI and also some proprietary videos. The performance of proposed approach is found to be encouraging compared to recently proposed approaches.

Fabrication of modified graphite bipolar plates by indirect selective laser sintering (SLS) for direct methanol fuel cells

Purpose – The purpose of this paper is to produce electrically conductive, fluid impermeable graphite bipolar plates for a direct methanol fuel cell, using indirect selective laser sintering (SLS) and suitable post processing techniques.Design/methodology/approach – Bipolar plates are made by the indirect SLS of graphite powder and phenolic resin mixture. The phenolic resin binder is then burnt off at a high temperature in a vacuum furnace to produce a 100 per cent carbon part. This brown part is then infiltrated using a low‐viscosity (∼5‐10 cps) cyanoacrylate to seal up the open pores, rendering the plates fluid impermeable.Findings – It has been found that the electrical conductivity increases significantly (> 220 S/cm) with a corresponding increase in pyrolyzing temperature which correlates well with literature on the carbonization of phenol formaldehyde resins. The cyanoacrylate infiltrated parts tested under fluid pressure demonstrated no leakage through the plate, indicating full closure of open po...

Microwave processing of sprayed alumina composite for enhanced performance

Abstract To meet the challenging in-service requirements, surfaces of many mechanical components need to be modified. This can be achieved by altering the surface properties through deposition technique followed by suitable post processing. Apart from the conventional methods, laser treatment is the most popular post processing technique. Of late, microwave heating is emerging as one of the potential post processing sources. Microwave processing of materials is fundamentally different from traditional techniques. In microwave processing, energy is directly transferred to the material through interaction of electromagnetic waves with molecules leading to volumetric heating. However, for processing of transparent (to microwaves) materials, a technique known as microwave hybrid heating (MHH) can be used. In this study, MHH is used for post processing of plasma deposited alumina–titania ceramic composite coatings on steel substrate; resulting properties of the post processed coatings are evaluated. Results show reduction in porosity, enhancement in microhardness, and wear resistance of the irradiated coatings owing to microstructural changes and densification. Results are discussed with suitable illustrations.

Open-loop pulsed hysteresis graph system for the magnetization of rare-earth magnets

An open-loop pulsed hysteresis graph system can magnetize and characterize ceramic and rare-earth permanent magnets such as neodymium, samarium cobalt, and alnico of cylindrical and rectangular shapes. The prototype system relies on an air-core excitation coil with an inner diameter of 3 cm and a length of 10 cm. A pulsed power supply provides a transient current pulse of up to 9000 A into the air-core coil. The pulse duration is typically on the order of 15 to 20 ms. In addition, a pair of Helmholtz coils records the applied magnetic field strength, whereas a local coil, tightly wound around the permanent magnet, records the magnetic flux density in the sample. Both fields are electronically acquired, digitized, and processed in a digital computer to obtain the hysteresis graph response of the sample. The processing takes into account the demagnetization field due to the open-loop system configuration. This paper presents the system concept in terms of the hardware and software realizations. An integral part of the data processing is calculation of the demagnetization factors that are needed to correct for the open-loop magnetization arrangement. Furthermore, a finite-element postprocessing procedure corrects for the influence of eddy currents in highly conductive samples. In tests of the prototype system with ceramic and neodymium permanent magnet samples, the pulsed field predictions compare favorably against reference data and dc hysteresis graph measurements of samples of low conductivity. Even for high-conductivity samples such as alnico, good agreement can be achieved through suitable post processing steps.

An efficient modified block coding technique

In this paper a new pel modification technique which preserves some topological properties of two-tone image is proposed. This technique creates more uniform gray-level blocks than were present in the originals two-tone image. This change enhances the compression efficiency of the block coding for two-tone image. The technique is applied on two different types of images and the results show that due to pel modification to compression efficiency is increased by a considerable amount. A suitable post processing smoothing technique is also proposed to recover the quality of the modified image to a great extent during decoding.

Refinements to the linear velocity inversion theory

The linear inversion method presented by Cohen and Bleistein in 1979 gives seriously degraded results when large reflectors are encountered. Obviously there is an irrecoverable loss of information when such a linear algorithm is applied to a nonlinear world. However, in many cases, excellent results can be achieved by suitable postprocessing of the output of the basic linear inversion algorithm. Although a certain degree of helpful postprocessing can be and has been performed by straightforward consideration of the linearization process, we present here a substantially improved postprocessing algorithm. The basis for these improvements is a more accurate scattering model due to Lahlou et al where, among other things, a WKB analysis of the wave equation led to a much more accurate accounting of the geometric spreading of the scattered wave. These notions plus an effective use of traveltime are used in the new algorithm to improve both the estimate of the reflector locations and the estimate of amplitude (velocity or acoustic impedance) change across the reflectors. The basic idea is to insert this idealized scattering data into the original linear algorithm, and then use the result of this computation as a guide in the interpretation of the numerical output of the algorithm. We demonstrate the result of computer implementation of this algorithm on synthetic data, with and without noise, and verify that the postprocessing algorithm produces dramatically improved reflector locations and speed estimates. Moreover, the new algorithm adds only very modest cost to the basic processing, which is, in turn, very competitive in cost to other multidimensional algorithms.