System for encoding image data into multiple layers representing

Details System for encoding image data into multiple layers representing System for encoding image data into multiple layers representing

1994-12-27

1996-09-17

Boudreau, Leo

Image analysis

Applications

Motion or velocity measuring

382236, G06K 936

Patent

active

055576842

ABSTRACT:
A system stores images as a series of layers by determining (i) the boundaries of regions of coherent motion over the entire image, or frame, sequence; and (ii) associated motion parameters, or coefficients of motion equations, that describe the transformations of the regions from frame to frame. The system first estimates motion locally, by determining the movements within small neighborhoods of pixels from one image frame i to the next image frame i+1, to develop an optical flow, or dense motion, model of the image. Next, the system estimates the motion using affine or other low order, smooth transformations within a set of regions which the system has previously identified as having coherent motion, i.e., identified by analyzing the motions in the frames i-1 and i. It groups, or clusters, similar motion models and iteratively produces an updated set of models for the image. The system then uses the local motion estimates to associate individual pixels in the image with the motion model that most closely resembles the pixel's movement, to update the regions of coherent motion. Using these updated regions, the system iteratively updates its motion models and, as appropriate, further updates the coherent motion regions, and so forth. The system then does the same analysis for the remaining frames. The system next segments the image into regions of coherent motion and defines associated layers in terms of (i) pixel intensity values, (ii) associated motion model parameters, and (iii) order in "depth" within the image.

REFERENCES:
patent: 5214504 (1993-05-01), Toriu
Sam Liu et al., Segmentation-Based Coding of Motion Difference and Motion Field Images For Low Bit-Rate Video Compression, 1992 IEEE, pp. III-525-528.
Bruce D. Lucus et al., An Iterative Image Registration Technique with an Application to Stereo Vision, Computer Science Department, Carnegie-Mellon University, Pittsburgh, Pennsylvania, pp. 121-130.
Lenz et al., Image Sequence Coding Using Scene Analysis And Spatio-Temporal Interpolation, NATO ASI Series, vol. F2, 1983 pp. 265-274.
Nicolas et al., Region-Based Motion Estimation Using Deterministic Relaxation Schemes For Image Sequence Coding, Sep. 1992, pp. 111-265-268.
Irani et al., Image Sequence Enhancement Using Multiple Motions Analysis, Dept. of Computer Science, The Hebrew University of Jerusalem, Techincal Report 91-15, Dec. 1991, pp. 2-26.
Darrell & Pentland : "Robust Estimation of a Muti-Layered. . ." Oct. 1991, IEEE, pp. 173-178.

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