Evaluation method, and evaluation apparatus

Patent metadata

Field	Value
Publication number	US-9847042-B2
Application number	US-201414573719-A
Country	US
Kind code	B2
Filing date	Dec 17, 2014
Priority date	Jan 7, 2014
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

A computer-readable recording medium stores therein an evaluation program, the evaluation program causing a computer to execute a process including, acquiring, from a plurality of captured images obtained by sequential image capturing, a motion of a person taking a beat in the plurality of captured images, or a timing at which the person takes the beat; and outputting an evaluation on a rhythm of the motion of the person based on a rhythm indicated by the acquired motion or the acquired timing.

First claim

What is claimed is:

1. A non-transitory computer-readable recording medium having stored therein an evaluation program, the evaluation program causing a computer to execute a process comprising:
calculating a background difference amount of each of a plurality of frames obtained by sequential image capturing as a number of pixels that are included in a frame and a difference between brightness of which and background data calculated from frames that are obtained before the frame is larger than a threshold;
detecting, from among the plurality of frames, beat frames, wherein the background difference amount of a beat frame is smaller than background difference amounts of frames sequentially obtained just before the beat frame that continually decrease, and the background difference amount of the beat frame is also smaller than background difference amounts of frames sequentially obtained just after the beat frame that continually increase, the beat frame indicating a timing at which a person displayed in the plurality of frames takes a beat; and
outputting an evaluation on a rhythm of a motion of the person based on a rhythm indicated by the beat frames.

2. The non-transitory computer-readable recording medium having stored therein the evaluation program according to claim 1 , the evaluation program causing the computer to execute the process further comprising:
calculating a beat difference for a beat frame as a difference between a first frame difference that is a number of frames existing from the beat frame to a beat frame prior to the beat frame and a second frame difference that is a number of frames existing from the beat frame to a beat frame next to the beat frame; and
performing control such that a score of the evaluation increases with a decrease in the beat difference.

3. The non-transitory computer-readable recording medium having stored therein the evaluation program according to claim 2 , the evaluation program causing the computer to execute the process further comprising, making an evaluation such that the score of the evaluation increases with an increase in a number of beat differences for respective beat frames, the beat differences being equal to or smaller than a predetermined value.

4. The non-transitory computer-readable recording medium having stored therein the evaluation program according to claim 2 , the evaluation program causing the computer to execute the process further comprising, making an evaluation such that the score of the evaluation increases correspondingly to consecutiveness of beat differences for respective beat frames, the beat differences being equal to or smaller than a predetermined value.

5. The non-transitory computer-readable recording medium having stored therein the evaluation program according to claim 1 , the evaluation program causing the computer to execute the process further comprising, outputting the evaluation on the rhythm of the motion of the person based on a comparison of the rhythm indicated by the beat frames with a reference rhythm.

6. The non-transitory computer-readable recording medium having stored therein the evaluation program according to claim 5 , wherein, the reference rhythm includes a rhythm acquired based on sound information output in parallel with the plurality of frames.

7. The non-transitory computer-readable recording medium according to claim 1 , the process further comprising:
counting a frame difference as a number of frames that exist from a beat frame to a beat frame prior or next thereto, wherein
the outputting includes outputting an evaluation on a rhythm of a motion of the person based on the counted frame difference.

8. An evaluation method comprising:
calculating, using a processor, a background difference amount of each of a plurality of frames obtained by sequential image capturing as a number of pixels that are included in a frame and a difference between brightness of which and background data calculated from frames that are obtained before the frame is larger than a threshold;
detecting, from among the plurality of frames, beat frames, wherein the background difference amount of a beat frame is smaller than background difference amounts of frames sequentially obtained just before the beat frame that continually decrease, and the background difference amount of the beat frame is also smaller than background difference amounts of frames sequentially obtained just after the beat frame that continually increase, the beat frame indicating a timing at which a person displayed in the plurality of frames take a beat; and
outputting, using the processor, an evaluation on a rhythm of a motion of the person based on a rhythm indicated by the beat frames.

9. An evaluation apparatus, comprising:
a memory; and
a processor coupled to the memory, wherein the processor executes a process comprising:
calculating a background difference amount of each of a plurality of frames obtained by sequential image capturing as a number of pixels that are included in a frame and a difference between brightness of which and background data calculated from frames that are obtained before the frame is larger than a threshold;
detecting, from among the plurality of frames, beat frames, wherein the background difference amount of a beat frame is smaller than background difference amounts of frames sequentially obtained just before the beat frame that continually decrease, and the background difference amount of the beat frame is also smaller than background difference amounts of frames sequentially obtained just after the beat frame that continually increase, the beat frame indicating a timing at which a person displayed in the plurality of frames takes a beat; and
outputting an evaluation on a rhythm of a motion of the person based on a rhythm indicated by the beat frames.

Assignees

• Fujitsu Ltd

Inventors

• Sakai Miho
• Oguchi Atsushi

Classifications

• G06T7/254

  involving subtraction of images · CPC title

• G06K9/00342

  Physics · mapped topic

• G06K2009/3291

  Physics · mapped topic

• G06T2207/30196

  Human being; Person · CPC title

• G09B19/003 Primary

  Repetitive work cycles; Sequence of movements · CPC title