Optical flow interpolation of serial slice images

Winston L. Williams; William A. Barrett

doi:10.1117/12.154493

14 September 1993 Optical flow interpolation of serial slice images

Winston L. Williams, William A. Barrett

Proceedings Volume 1898, Medical Imaging 1993: Image Processing; (1993) https://doi.org/10.1117/12.154493
Event: Medical Imaging 1993, 1993, Newport Beach, CA, United States

Abstract

Optical flow has been used for matching or tracking of individual image objects through a time sequence of images and is applied to the problem of image interpolation by treating the serial slice images as a spatial sequence. Calculation of optical flow between two images results in a 'velocity vector map' indicating the relative displacement between similar structures in both images. Thus, individual vectors are used to match points in adjoining images and interpolate between their corresponding intensities. The interpolated intensity is then redistributed and normalized by unit area in the interpolated slice. The accuracy of optical flow interpolation is evaluated by generating an interpolated slice, i', from original slices i-l and i+l and then comparing i' with the original middle scanned slice, i. Optical flow interpolation compares favorably to linear interpolation both visually and quantitatively. Quantitative comparison, i-i', shows a 253% improvement over linear interpolation for synthetic binary images and a 13% improvement over linear interpolation for grayscale CT images.

Citation Download Citation

Winston L. Williams and William A. Barrett "Optical flow interpolation of serial slice images", Proc. SPIE 1898, Medical Imaging 1993: Image Processing, (14 September 1993); https://doi.org/10.1117/12.154493

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