[특허]Method for estimating the motion of at least one target in a sequence of images and device to implement this method

Method for estimating the motion of at least one target in a sequence of images and device to implement this method 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G06F-015/70 H04N-005/14
출원번호	US-0433790 (1989-11-09)
우선권정보	FR-0014677 (1988-11-10)
발명자 / 주소	Ferre Alain (Cesson Sevigne FRX) Chevance Christophe (Rennes FRX) Quignon Jean (Crepy en Valois FRX)
출원인 / 주소	Thomson-CSF (Puteaux FRX 03)
인용정보	피인용 횟수 : 24 인용 특허 : 0

초록 ▼

The disclosed method consists in: method for estimating the motion of at least one target in a sequence of images, including: coefficients transformed by the Fourier transform; computing a matrix called a phase correlation matrix, each coefficient of which is equal to the product of a transformed coefficient of a first image, by the conjugate of a homologous transformed coefficient of a second image, divided by the square of the modulus of this product; computing an inverse transformed matrix of the phase correlation matrix, in applying the inverse Fourier transform; searching, among the coefficients of the inverse transformed matrix, for those coefficients having the greatest moduli; then estimating a translation vector for each target and a translation vector of the image background, on the basis of the order of the row and of the order of the column in which there are respectively located the coefficients having these greatest moduli.

대표청구항 ▼

A method for estimating the motion of at least one target in a sequence of images, the motion of this target and the motion of the background of the images being comparable to translations, said method consisting in the steps of: sampling each image, then representing each sample by the value of its luminance; computing, for each image, a matrix of coefficients transformed by the two-dimensional discrete Fourier transform; computing a phase correlation matrix, each coefficient of which is equal to the product of a transformed coefficient of a first image, by the conjugate of a homologous transformed coefficient of a second image, divided by the square of the modulus of this product; computing an inverse transformed matrix of the phase correlation matrix, in applying the inverse Fourier transform to the phase correlation matrix; making a first comparison, with a predetermined threshold value, of the coefficients of the inverse transformed matrix of the phase correlation matrix and searching for that coefficient which has the greatest modulus, this coefficient corresponding to a translation of the image background, while the other coefficients having a modulus greater than the value of the first threshold correspond to possible targets; then estimating a translation vector for each possible target and a translation vector of the image background, in a reference position related to the first image, on the basis of the order (x) of the row and of the order (y) of the column in which there is located the coefficient corresponding respectively to each target and to the background of the image, in the inverse transformed matrix of the phase correlation matrix; resetting the background of the first image in relation to the background of the second image, as a function of the translation vector estimated for the background; computing the absolute values of the differences in luminance between the first image, the background of which has been reset, and the second image, these values of differences in luminance constituting an image called a difference image; comparing the absolute values of the differences in luminance with a second predetermined threshold value; each pixel with a difference in luminance greater than the second threshold value being considered as a pixel in motion; attributing each pixel in motion to a zone formed by pixels that are in motion and are adjoining; computing a speed vector for each zone, in computing a vector of translation of this zone from a first difference image to a second difference image; computing a speed vector for each target, as a function of the translation vector estimated for this target and as a function of translation vector estimated for the image background; concluding that a zone belongs to a target when its speed vector coincides with the speed vector of a target.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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연합인증

Method for estimating the motion of at least one target in a sequence of images and device to implement this method 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

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연합인증

Method for estimating the motion of at least one target in a sequence of images and device to implement this method 원문보기

초록 ▼

대표청구항 ▼

연구과제 타임라인

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이 특허를 인용한 특허 (24)

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