OBJECT VELOCITY MEASURING APPARATUS AND OBJECT VELOCITY MEASURING METHOD
First Claim
1. An object velocity measuring apparatus for measuring an object velocity in a photographic field from a plurality of photographic frames made up of a plurality of pixels, the object velocity measuring apparatus comprising:
- an object area extracting unit configured to extract, as an object area, a set of pixels from which an object has been sensed over at least M (M<
N) of N successive frames including the present frame;
a center-of-gravity computing unit configured to calculate the center-of-gravity position coordinates of the extracted object area in the photographic field; and
a velocity computing unit configured to calculate the object velocity from the movement of the calculated center-of-gravity position coordinates between different frames, wherein the center-of-gravity computing unit, when the object area corresponding to the same object is separated into a plurality of segments, calculates the weighted mean of the center-of-gravity position coordinates of each segment, using the area of each segment in the photographic field as a weight, and determines the center-of-gravity position coordinates of the object area in the photographic field.
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Abstract
An object velocity measuring apparatus of this invention for measuring an object velocity in a photographic field from a plurality of photographic frames made up of a plurality of pixels comprises an object area extracting unit configured to extract, as an object area, a set of pixels from which an object has been sensed over at least M (M<N) of N successive frames including the present frame, a center-of-gravity computing unit configured to calculate the center-of-gravity position coordinates of the extracted object area in the photographic field, and a velocity computing unit configured to calculate the object velocity from the movement of the calculated center-of-gravity position coordinates between different frames.
10 Citations
10 Claims
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1. An object velocity measuring apparatus for measuring an object velocity in a photographic field from a plurality of photographic frames made up of a plurality of pixels, the object velocity measuring apparatus comprising:
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an object area extracting unit configured to extract, as an object area, a set of pixels from which an object has been sensed over at least M (M<
N) of N successive frames including the present frame;
a center-of-gravity computing unit configured to calculate the center-of-gravity position coordinates of the extracted object area in the photographic field; and
a velocity computing unit configured to calculate the object velocity from the movement of the calculated center-of-gravity position coordinates between different frames, wherein the center-of-gravity computing unit, when the object area corresponding to the same object is separated into a plurality of segments, calculates the weighted mean of the center-of-gravity position coordinates of each segment, using the area of each segment in the photographic field as a weight, and determines the center-of-gravity position coordinates of the object area in the photographic field. - View Dependent Claims (2, 3, 4, 5)
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6. An object velocity measuring method of measuring an object velocity in a photographic field from a plurality of photographic frames made up of a plurality of pixels, the object velocity measuring method comprising:
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a first step of extracting, as an object area, a set of pixels from which an object has been sensed over at least M (M<
N) of N successive frames including the present frame;
a second step of calculating the center-of-gravity position coordinates of the extracted object area in the photographic field; and
a third step of calculating the object velocity from the movement of the calculated center-of-gravity position coordinates between different frames, wherein the second step is a step which, when the object area corresponding to the same object is separated into a plurality of segments, calculates the weighted mean of the center-of-gravity position coordinates of each segment, using the area of each segment in the photographic field as a weight, and determines the center-of-gravity position coordinates of the object area in the photographic field. - View Dependent Claims (7, 8, 9, 10)
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Specification