| || 2-D Shape Fitting for Locating Exploding Projectile from Explosion Patch
Author : Ray, Kunal
Source : Defence Science Journal ; Vol:60(3) ; 2010 ; pp 238-243
Subject : 53 Applied Physics;Defence Science Journal
Keywords : Proximity fuze;variable-time fuze;explosion patch
Abstract : For test and evaluation of a proximity fuze, it is necessary to know the distance offset of the exploding ammunition round, fitted with the fuze, from a specific target. If the event is recorded using in-line high-speed photography the event of explosion can be resolved in time, and it becomes necessary to ascertain the position of the round, wrt the target, as it is exploding. An estimation of intensity centroid position fails as the flash is non-uniform in nature and is partially occluded by the exploding round. This paper is about an approach to find the location of the round using 2-D shapes fitting of the explosion patch.
| || Fast Change Detection
Author : Bose, Aniruddha;Ray, Kunal
Source : Defence Science Journal ; Vol:61(1) ; 2011 ; pp 51-56
Subject : 621.38 Electronics
Keywords : Image processing;Fast algorithm;Image differencing technique
Abstract : Automated detection of changes in a sequence of images captured under fixed background and steady light condition is an often required operation having widespread application. Possible application areas can be as diverse as from military to atmospheric science, from medicine to video surveillance, etc. There are many approaches to the problem of detecting changes; the more reliable one tries to make these more complex and computationally expensive these become, requiring sophisticated algorithms and specialised hardware. However, often one needs to use simple and computationally cheap procedures to be used with cots hardware when the problem scenario has static features with transient change in features associated to some small part of the image or field of view. A super-pixel-based change detection algorithm has been descried here that is basically a modification of the image differencing technique. The procedure has been seen to detect even a small transient change in intensity at a frame rate of as high as fifty frames per second using cots hardware.