Cross Dissolve Without Cross Fade: Preserving Contrast, Color and Salience in Image Compositing

dc.contributor.authorGrundland, Marken_US
dc.contributor.authorVohra, Rahulen_US
dc.contributor.authorWilliams, Gareth P.en_US
dc.contributor.authorDodgson, Neil A.en_US
dc.description.abstractLinear interpolation is the standard image blending method used in image compositing. By averaging in the dynamic range, it reduces contrast and visibly degrades the quality of composite imagery. We demonstrate how to correct linear interpolation to resolve this longstanding problem. To provide visually meaningful, high level control over the compositing process, we introduce three novel image blending operators that are designed to preserve key visual characteristics of their inputs. Our contrast preserving method applies a linear color mapping to recover the contrast lost due to linear interpolation. Our salience preserving method retains the most informative regions of the input images by balancing their relative opacity with their relative saliency. Our color preserving method extends homomorphic image processing by establishing an isomorphism between the image colors and the real numbers, allowing any mathematical operation defined on real numbers to be applied to colors without losing its algebraic properties or mapping colors out of gamut. These approaches to image blending have artistic uses in image editing and video production as well as technical applications such as image morphing and mipmapping.Categories and Subject Descriptors (according to ACM CCS): I.3.3 [Computer Graphics]: Picture/Image Generationen_US
dc.description.seriesinformationComputer Graphics Forumen_US
dc.publisherThe Eurographics Association and Blackwell Publishing, Incen_US
dc.titleCross Dissolve Without Cross Fade: Preserving Contrast, Color and Salience in Image Compositingen_US