tr-2003-40.doc - Image Stacks Michael F Cohen Alex Colburn...

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Image Stacks Michael F. Cohen Alex Colburn Steven Drucker Microsoft Research Technical Report MSR-TR-2003-40
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Abstract We present a simple but powerful Image Stack process for creating an enhanced image from a stack of registered images. This paradigm combines pixels using multi-image operations on a set of images of the same subject matter. We demonstrate how Image Stacks can help create group photographs, enhance high dynamic range images, combine images captured under different lighting conditions, remove unwanted objects from images, and combine images captured at different times and with different focal lengths. 1 Introduction Taking group photographs can be frustrating because capturing a single image in which everyone is smiling and has their eyes open is nearly impossible (e.g., the top 4 pictures in Figure 1). Most photographers take a series of photographs hoping to capture at least one satisfactory image of the group. However, this approach may never yield such an image. On the other hand, within the series of images, it is likely that at least one good image of each individual within the group will be captured. A group photograph could be created by combining the best portions of each individual image into a single composite image such as the result at the bottom of Figure 1. This is only the simplest idea for ways to combine images. This paper presents an Image Stack process for easily combining individual images into an enhanced composite image. An image stack is a set of identically sized registered images that may originate from any stationary still or video camera. If a stationary camera was not used to capture a set of images, the images may be registered by manually aligning them or using an automated registration procedure [1]. Image Stacks also provides filters that may be applied to the 3D image stack to create new 2D intermediate images. A user then selects at least one source image, either one of the original images or an intermediate image, from which pixel values may be composited (or painted) to a new resultant image. The user may successively select as many source images as desired to create the final composite image. In addition to improving group photographs, Image Stacks may be used for a variety of applications such as enhancing high dynamic range images, combining images captured under different lighting conditions, removing objects from images, and combining images captured at multiple points in time or with different focal lengths. Some of the individual techniques and ideas used within Image Stacks have been seen before in different settings. However, to date no one has combined all of the methods under a simple user interface for combining multiple images. For example, the rubber stamp tool in Photoshop or clone brush in PaintShop Pro foreshadow the uses of brushes to move “paint” from one image to another. Massey and Bender’s work in Salient Stills [6] introduced the idea of using multiple images in creative ways. However, they do not discuss the breadth of techniques
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  • Spring '13
  • L
  • Computer Graphics, High dynamic range imaging, powerful Image Stack process

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