Estimation of picture motion blurriness

A device for estimating a blurriness value, comprising:

• 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.

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:

• 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.

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:

• 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.