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Determining Optical Flow
 ARTIFICIAL INTELLIGENCE
, 1981
"... Optical flow cannot be computed locally, since only one independent measurement is available from the image sequence at a point, while the flow velocity has two components. A second constraint is needed. A method for finding the optical flow pattern is presented which assumes that the apparent veloc ..."
Abstract

Cited by 1727 (7 self)
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Optical flow cannot be computed locally, since only one independent measurement is available from the image sequence at a point, while the flow velocity has two components. A second constraint is needed. A method for finding the optical flow pattern is presented which assumes that the apparent velocity of the brightness pattern varies smoothly almost everywhere in the image. An iterative implementation is shown which successfully computes the optical flow for a number of synthetic image sequences. The algorithm is robust in that it can handle image sequences that are quantized rather coarsely in space and time. It is also insensitive to quantization of brightness levels and additive noise. Examples are included where the assumption of smoothness is violated at singular points or along lines in the image.
Chapter 8 Relative Orientation of Stereo Images
"... This paper presents a direct closedform solution to the general relative orientation problem. We shall concentrate on the existence and correctness of this solution. The error sensitivity analysis is beyond the scope of this paper. However, a numerical example and a real image application are provi ..."
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This paper presents a direct closedform solution to the general relative orientation problem. We shall concentrate on the existence and correctness of this solution. The error sensitivity analysis is beyond the scope of this paper. However, a numerical example and a real image application are provided. 240 CHAPTER 8. RELATIVE ORIENTATION