Rough Set Based Contour Approximation From Flickering Depth Images

Abstract

This paper describes a Rough Set based method to approximate the contour of flickering depth images taken from coded light camera. Due to the flickering effect sometimes some contour pixels are appearing and disappearing at the same location which leads to problem in detecting the true contour and corners of the object. This effect may be more or less depending on calibration and selection of frames per second (FPS) factor. Even after everything is done this effect of flicker is present in depth camera images and it comes inevitably with the technology used for imaging. The concept of Rough Set is applied to determine contour with accuracy. The persistent pixels of the object image are kept in lower approximation and boundary pixels which are not consistent are kept in upper approximation of contour set. Pixels from both lower and upper approximation are chosen to delineate the contour of object in the image.