[특허]Method for estimating velocity vector fields from a time-varying image sequence

Method for estimating velocity vector fields from a time-varying image sequence 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G06K-009/00
출원번호	US-0631750 (1990-12-20)
발명자 / 주소	Fogel Sergei V. (Rochester NY)
출원인 / 주소	Eastman Kodak Company (Rochester NY 02)
인용정보	피인용 횟수 : 31 인용 특허 : 0

초록 ▼

Changes in successive images from a time-varying image sequence of a scene are characterized by velocity vector fields. As estimate of the velocity vector field is determined as a compromise in the attempt to satisfy the following two sets of constraints in addition to a regularization constraint: the optical flow constraints which relate to the values of the time-varying images function at corresponding points of the successive image of the sequence, and the directional smoothness constraints, which relate the values of the neighboring velocity vectors. To achieve such a compromise, a system of nonlinear equations of the unknown estimate of the velocity vector field is used. A stable iterative method is used to solve this system. The optical flow and smoothness constraints are selectively suppressed in the neighborhoods of the occlusion boundaries. The last is accomplished by attaching a weight to each constraint. The spatial variations in the values of the time-varying image function near corresponding points of the successive images of the sequence, with the correspondence specified by a current estimate of the velocity vector field, and variation in the current estimate of the velocity vectors themselves are implicitly used to adjust the weighting function.

대표청구항 ▼

A method for modifying a time-varying image sequence comprising the steps of: a. estimating a velocity vector field from a time-varying image sequence, said step of estimating including: i. forming a matrix of image irradiance function values for each image of a time-varying image sequence; ii. forming a multilevel resolution pyramid for each image of a time-varying image sequence by correlating on each level the matrix of image irradiance function values with a matrix of weights obtained by sampling a measurement function corresponding to that level and then by sampling on each level the function that resulted from the correlation at specific image locations; iii. defining these specific images locations of each coarser level of the resolution pyramid by subsampling the specific image locations of the preceding finer level; iv. selecting an initial estimate of the velocity vector field for the coarsest level of said multilevel pyramid and determining an improved estimate of the velocity vector field based on the initial estimate of the velocity vector; v. projecting the improved estimate of the velocity vector field from the coarsest level of said multilevel pyramid to the next finer level of said multilevel resolution pyramid to obtain the initial estimate for that level and determining the improved estimate of the velocity vector of this level based on the initial estimate of the velocity vector; vi. continuing the projection and determining step for each of the remaining levels of the multilevel resolution pyramid; and vii. utilizing the improved estimate of the velocity vector field from the finest level of said multilevel resolution pyramid as the determined estimate of the velocity vector field; and; b. applying the determined estimate to modify at least one image in the time-varying sequence.

이 특허를 인용한 특허 (31)

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Method for estimating velocity vector fields from a time-varying image sequence 원문보기

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Method for estimating velocity vector fields from a time-varying image sequence 원문보기

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