Estimation of picture motion blurriness
First Claim
1. A method for estimating a blurriness value, comprisingacquiring a series of at least two frames within a period of time greater than a given exposure time to be used for acquisition of a still picture being distinct from the at least two frames;
- grouping said at least two frames in at least one couple of frames;
determining, for each of the at least one couple of frames of the series, first and second displacement values corresponding to a displacement according to a first direction and a second direction, between a first frame and a second frame of a couple of frames;
determining a first blur measure for one direction among said first and second directions by calculating a metric based on the first and second displacement values for each of the at least one couple of frames of at least a subset of said series;
determining a second blur measure for the other direction among the first and second directions by calculating a metric applied to said first and second displacement values for each of the at least one couple of frames of the series of frames; and
determining a blurriness value based on said first and second blur measures.
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Abstract
The invention relates to a method for estimating a blurriness value based on a series of at least two frames acquired within a period of time greater than or equal to a given exposure time, the frames being grouped in at least one couple of frames, characterized in that it comprises determining, for each couple of frames of the series, first and second values corresponding to a displacement according to a first direction and a second direction, between the first frame and the second frame of a couple of frames, determining a first blur measure for one direction among the first and second directions by calculating a metric based on the displacement values for each couple of frames of at least a subset of the series, determining a second blur measure for the other direction among the first and second directions by calculating a metric applied to the displacement values for each couple of frames of the series of frames and determining a blurriness value based on the first and second blur measures.
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Citations
15 Claims
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1. A method for estimating a blurriness value, comprising
acquiring a series of at least two frames within a period of time greater than a given exposure time to be used for acquisition of a still picture being distinct from the at least two frames; -
grouping said at least two frames in at least one couple of frames; determining, for each of the at least one couple of frames of the series, first and second displacement values corresponding to a displacement according to a first direction and a second direction, between a first frame and a second frame of a couple of frames; determining a first blur measure for one direction among said first and second directions by calculating a metric based on the first and second displacement values for each of the at least one couple of frames of at least a subset of said series; determining a second blur measure for the other direction among the first and second directions by calculating a metric applied to said first and second displacement values for each of the at least one couple of frames of the series of frames; and determining a blurriness value based on said first and second blur measures. - View Dependent Claims (2, 3, 4, 5, 6, 7, 13)
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8. A device for estimating a blurriness value, comprising:
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a frame acquisition unit adapted to acquire a series of at least two frames within a period of time greater than or equal to a given exposure time to be used for the acquisition of a still picture being distinct from the at least two frames, said frames being grouped in at least one couple of frames; a motion estimation unit adapted to determine for each of the at least one couple of frames of the series, first and second displacement values corresponding to a displacement according to a first direction and a second direction, between a first frame and a second frame of a couple of frames; and a calculation unit adapted to determine a first blur measure for one direction among said first and second directions by calculating a metric applied to the first and second displacement values for each of the at least one couple of frames of at least a subset of said series, to determine a second blur measure for the other direction among the first and second directions by calculating a metric applied to said first and second displacement values for each of the at least one couple of frames of the series of frames and to determine a blurriness value based on said first and second blur measures. - View Dependent Claims (9, 10, 11, 12)
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14. A method for estimating a blurriness value based on a series of at least two frames acquired within a period of time greater than or equal to a given exposure time, said frames being grouped in at least one couple of frames, wherein the method comprises:
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determining, for each of the at least one couple of frames of the series, first and second displacement values corresponding to a displacement according to a first direction and a second direction, between a first frame and a second frame of a couple of frames; determining a first blur measure for one direction among said first and second directions by calculating a metric based on the first and second displacement values for each of the at least one couple of frames of at least a subset of said series; determining a second blur measure for the other direction among the first and second directions by calculating a metric applied to said first and second displacement values for each of the at least one couple of frames of the series of frames; and determining a blurriness value based on said first and second blur measures; taking a decision to acquire a picture based on the determined blurriness value; acquiring said picture depending on said decision.
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15. A device for estimating a blurriness value based on a series of at least two frames acquired within a period of time greater than or equal to a given exposure time, said frames being grouped in at least one couple of frames, wherein the device comprises:
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a motion estimation unit adapted to determine for each of the at least one couple of frames of the series, first and second displacement values corresponding to a displacement according to a first direction and a second direction, between a first frame and a second frame of a couple of frames; a calculation unit adapted to determine a first blur measure for one direction among said first and second directions by calculating a metric applied to the first and second displacement values for each of the at least one couple of frames of at least a subset of said series, to determine a second blur measure for the other direction among the first and second directions by calculating a metric applied to said first and second displacement values for each of the at least one couple of frames of the series of frames and to determine a blurriness value based on said first and second blur measures; a decision unit adapted to take a decision to acquire a picture based on the determined blurriness value; and a picture acquisition unit adapted to acquire said picture depending on said decision.
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Specification