Spatially-Varying Image Warping: Evaluations and VLSI Implementations

Abstract

Abstract. Spatially-varying, non-linear image warping has gained growing interest due to the appearance of image domain warping applications such as aspect ratio retargeting or stereo remapping/stereo-to-multiview conversion. In contrast to the more common global image warping, e.g., zoom or rotation, the image transformation is now a spatially-varying mapping that, in principle, enables arbitrary image transformations. A practical constraint is that transformed pixels keep their relative ordering, i.e., there are no fold-overs. In this work, we analyze and compare spatially-varying image warping techniques in terms of quality and computational performance. In particular, aliasing artifacts, interpolation quality (sharpness), number of arithmetical operations, and memory bandwidth requirements are considered. Further, we provide an architecture based on Gaussian filtering and an architecture with bicubic interpolation and compare corresponding VLSI implementations.

Image stitching method by multi‐feature constrained alignment and colour adjustment

“…However, the geometric assumptions that camera rotation has a fixed projective center or the scenes have limited depth variance are not satisfied in practice. To compensate restrictions of these geometric assumptions, spatially varying warping methods are proposed [4]. However, their accuracy and robustness are still not good enough in practical applications, because ghosting and obvious chromatic aberration or illumination difference still exists, [5] based on a technique called moving direct linear transformation.…”