Exposure balancing and difference blurring to eliminate seam-lines in a real-time bird´s eye view monitor

A Bird´s Eye View Monitor usually shows visible seam-lines. Previous seam-line elimination methods limit the dynamic range of mosaicked image and require that the reference images are equal geometrically the regions that overlap. In this paper, we propose a camera model based alternative exposure compensation algorithm which controls brightness of reference images using calculated offset, and a seam-line difference blurring algorithm which gradually spreads the pixel by pixel difference of a seam-line over across the seam-line with no geometrical assumption. Moreover, we generalize the compensation algortihm for a circularly positioned and consecutively positioned N reference image mosaicking system. Our approach aims at extending the dynamic range, eliminating ghost images, and increasing system efficiency. Proposed algorithms run on real-time systems. Results are demonstrated using several images.