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EP0348207A2
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Image motion vector detecting apparatus
Assignee: Panasonic Holdings Corp
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Filing: 1989-06-23
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Granted: —
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Expires: 2009-06-23
Abstract
Abstract An image motion vector detecting apparatus includes a low-pass filter (12, 12′) for suppressing a spatial high frequency component of an image signal in one or both of the horizontal and vertical directions, and a high-pass filter (13) for suppressing a spatial low frequency component of an image signal in one or both of the horizontal and vertical directions. Using an image signal which has passed through the filters, a correlation value for discrete shifts is obtained through a matching operation. Based on the obtained correlation values, a correlation value for continuous shifts is estimated through interpolation processing. A shift having a minimum correlation value is calculated to detect an image motion vector.
Inventors
- 👤 Hirofumi Ishii
- 👤 Atsushi Morimura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 00:59
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/32; H04N5/00; H04N5/14; H04N5/144; H04N5/145; G; G06; G06T; G06T7/00; G06T7/20; G06T7/262; H04N19/00; H04N19/50; H04N19/503; H04N19/51; H04N19/523
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
75 words
An image motion vector detecting apparatus comprising: at least a one-dimensional or two-dimensional low-pass filter (12, 12′) for suppressing a high frequency component of image information at least in one of the horizontal and vertical directions; means (2 - 5) for obtaining correlation values for image signals shifted between two fields which image signals have passed through said low-pass filter; and means (6, 14) for detecting an image motion vector based on said correlation values.
Claim 2
Dependent Claim
75 words
An image motion vector detecting apparatus comprising: at least a one-dimensional or two-dimensional low-pass filter (12, 12′) for suppressing a high frequency component of image information at least in one of the horizontal and vertical directions; means (2 - 5) for obtaining correlation values for image signals shifted between two fields which image signals have passed through said low-pass filter; and means (6, 14) for detecting an image motion vector based on said correlation values.
Claim 3
Dependent Claim
76 words
An image motion vector detecting apparatus comprising: at least a one-dimensional or two-dimensional high-pass filter (13) for suppressing a d.c. and low frequency components of image information at least in one of the horizontal and vertical directions; means (2 - 5) for obtaining correlation values for image signals shifted between two fields which image signals have passed through said high-pass filter; and means (6, 14) for detecting an image motion vector based on said correlation values.
Claim 4
Dependent Claim
76 words
An image motion vector detecting apparatus comprising: at least a one-dimensional or two-dimensional high-pass filter (13) for suppressing a d.c. and low frequency components of image information at least in one of the horizontal and vertical directions; means (2 - 5) for obtaining correlation values for image signals shifted between two fields which image signals have passed through said high-pass filter; and means (6, 14) for detecting an image motion vector based on said correlation values.
Claim 5
Dependent Claim
82 words
An image motion vector detecting apparatus comprising: a band-pass filter for suppressing a d.c., low frequency and high frequency components of image information at least in one of the horizontal and vertical directions and extracting a predetermined bandwidth component of the image information; means (2 - 5) for obtaining correlation values for image signals shifted between two fields which image signals have passed through said high-pass filter; and means (6, 14) for detecting an image motion vector based on said correlation values.
Claim 6
Dependent Claim
82 words
An image motion vector detecting apparatus comprising: a band-pass filter for suppressing a d.c., low frequency and high frequency components of image information at least in one of the horizontal and vertical directions and extracting a predetermined bandwidth component of the image information; means (2 - 5) for obtaining correlation values for image signals shifted between two fields which image signals have passed through said high-pass filter; and means (6, 14) for detecting an image motion vector based on said correlation values.
Claim 7
Dependent Claim
26 words
An image motion vector detecting apparatus according to claim 1, wherein said one-dimensional or two-dimensional low-pass filter (12, 12′) includes an infinite impulse response low-pass filter.
Claim 8
Dependent Claim
37 words
An image motion vector detecting apparatus according to claim 2, wherein said one-dimensional or two-dimensional high-pass filter (13) picks up a difference between adjacent pixels or between pixels spaced apart from each other through a predetermined interval.
Claim 9
Dependent Claim
50 words
An image motion vector detecting apparatus according to claim 1, wherein said low-pass filter performs under-floating-point computation on a bit number of an inputted image signal and outputs a signal having at least one bit added under the decimal point or a signal having a gain of 2 and higher.
Claim 10
Dependent Claim
49 words
An image motion vector detecting apparatus according to claim 3, said band-pass filter performs under-floating-point computation on a bit number of an inputted image signal and outputs a signal having at least one bit added under the decimal point or a signal having a gain of 2 and higher.
Claim 11
Dependent Claim
102 words
An image motion vector detecting apparatus comprising: means (12, 12′, 13, 2 - 5) for obtaining correlation values for image signals shifted between two fields through a predetermined interval over the whole or a part of an image frame; means (6) for detecting a minimum or maximum point which is an optimum point of the correlation values; and means (14) for calculating a motion vector based on a position corrected for a certain amount in the direction from the optimum point to a point among the points about the optimum point which has a value relatively near that of the optimum point.
Claim 12
Dependent Claim
102 words
An image motion vector detecting apparatus comprising: means (12, 12′, 13, 2 - 5) for obtaining correlation values for image signals shifted between two fields through a predetermined interval over the whole or a part of an image frame; means (6) for detecting a minimum or maximum point which is an optimum point of the correlation values; and means (14) for calculating a motion vector based on a position corrected for a certain amount in the direction from the optimum point to a point among the points about the optimum point which has a value relatively near that of the optimum point.
Claim 13
Dependent Claim
31 words
An image motion vector detecting apparatus according to claim 8, wherein said predetermined interval is set to be one pixel in the horizontal direction and one line in the vertical direction.
Claim 14
Dependent Claim
70 words
An image motion vector detecting apparatus according to claim 8, wherein said predetermined interval is set to be two or more pixels in the horizontal direction and one line in the vertical direction, to be one pixel in the horizontal direction and two or more lines in the vertical direction, or to be two or more pixels in the horizontal direction and two or more lines in the vertical direction.
Claim 15
Dependent Claim
92 words
An image motion vector detecting apparatus according to claim 8, wherein, when said predetermined interval is set to be Ix in the horizontal direction and Iy in the vertical direction, provided at a preceding stage of said means for obtaining a correlation value is a low-pass filter for the horizontal direction having a cut-off frequency equal to or lower than 1/(2 x Ix), a low-pass filter for the vertical direction having a cut-off frequency equal to or lower than 1/(2 x Iy), or a two-dimensional low-pass filter having both above filter characteristics.
Claim 16
Dependent Claim
30 words
An image motion vector detecting apparatus according to claim 1, 2, 3 or 8, wherein said means for obtaining a correlation value is a matching method using a representative point.
References Cited (Backward Citations)
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