Download Computer vision for visual effects by Richard J. Radke PDF

By Richard J. Radke

Glossy blockbuster videos seamlessly introduce most unlikely characters and motion into real-world settings utilizing electronic visible results. those results are made attainable by means of study from the sphere of machine imaginative and prescient, the learn of ways to instantly comprehend pictures. desktop imaginative and prescient for visible results will train scholars, engineers, and researchers in regards to the primary machine imaginative and prescient ideas and state of the art algorithms used to create state of the art visible results for videos and tv. the writer describes classical laptop imaginative and prescient algorithms used regularly in Hollywood (such as blue display matting, constitution from movement, optical movement, and have monitoring) and intriguing fresh advancements that shape the root for destiny results (such as typical photo matting, multi-image compositing, photograph retargeting, and think about synthesis). He additionally discusses the applied sciences in the back of movement trap and 3-dimensional info acquisition. greater than two hundred unique photographs demonstrating rules, algorithms, and effects, in addition to in-depth interviews with Hollywood visible results artists, tie the mathematical suggestions to real-world filmmaking.

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17. While this approach lacks the mathematical model for how intensities and α’s are related through the matting equation that underlies Bayesian and closed-form matting, it turns out to work well in practice and be computationally efficient. It additionally matches our intuition; if there exists a path containing similar intensities between an unknown pixel i to the labeled foreground region F, while paths from i to the background region B need to cross dissimilar pixels, pixel i is more likely to be foreground.

280] proposed an algorithm called lazy snapping that speeds up the graph-cut segmentation algorithm by operating on superpixels instead of pixels. That is, the image pixels are clustered into small, roughly constant color regions using the watershed algorithm [514]. These regions then become the nodes of the graph-cut problem, since it’s assumed that all pixels within a superpixel have the same label. Since there are typically about ten to twenty times fewer nodes and edges in the superpixel problem, the cut can be computed at interactive rates.

In this context, it makes the most sense to interpret α as a measure of coverage by the foreground. 24). In this case, even though a pixel may be squarely in the foreground, its color may arise from a distorted surface on the background. Pulling a coveragebased matte of the foreground and compositing it on a new background will look awful, since the foreground should be expected to distort the new background and contain no elements of the old background. To address this issue, Zongker et al. [582] proposed environment matting, a system that not only captures a coverage-based matte of an optically active object but also captures a description of the way the object reflects and refracts light.

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