Event filtering device and motion recognition device thereof

1. A motion recognition device comprising:

an emitter configured to emit an infrared ray in a pattern;

a detector configured to detect events in a visible ray area and an infrared ray area;

a filter configured to determine whether at least one portion of the detected events is detected by using the infrared ray emitted in the pattern, and to ignore or accept the detected events based on a determination result; and

a motion recognizer configured to perform motion recognition based on the detected events accepted by the filter,

wherein the filter is further configured to ignore a first detected event when the first detected event is not detected by using the infrared ray emitted in the pattern, and to accept a second detected event when at least one portion of the second detected event is detected by using the infrared ray emitted in the pattern, and

wherein the first detected event ignored by the filter is blocked such that the motion recognizer performs the motion recognition based only on the second detected event accepted by the filter without the first detected event ignored by the filter.

2. The motion recognition device of claim 1 , wherein the filter is further configured to determine whether the at least one portion of the detected events is detected by using the infrared ray emitted in the pattern by determining whether the pattern is received based on the detected events.

3. The motion recognition device of claim 1 , wherein the detector is further configured to detect the events by detecting a change in an image input in at least one from among the visible ray area and the infrared ray area.

4. The motion recognition device of claim 1 , wherein the events comprise an event of an object moving in a detection area.

5. The motion recognition device of claim 1 , wherein the pattern comprises at least one of a temporal pattern, a spatial pattern, and a spatiotemporal pattern.

6. The motion recognition device of claim 1 , wherein the filter is configured to accept the detected events in response to a determination that the at least one portion of the detected events corresponds to a spatial pattern when the pattern is the spatial pattern.

7. The motion recognition device of claim 1 , wherein the filter is configured to accept the detected events in response to a determination that the at least one portion of the detected events comprises a frequency spectrum corresponding to a temporal pattern when the pattern is the temporal pattern.

8. The motion recognition device of claim 1 , wherein the filter is configured to accept the detected events in response to a determination that the at least one portion of the detected events comprises a frequency spectrum corresponding to a temporal pattern and the at least one portion of the detected events corresponds to a spatial pattern, when the pattern is a spatiotemporal pattern that comprises the temporal pattern and the spatial pattern.

9. The motion recognition device of claim 1 , wherein the detector is configured to output an event signal including an index of a pixel in which the events are detected and a time stamp at which the events are detected.

10. The motion recognition device of claim 9 , wherein the filter is configured to update a value of an element corresponding to the index and the time stamp from among a plurality of elements included in a set table based on the determination result being that the at least one portion of the detected events is detected using the infrared ray in the pattern.

11. The motion recognition device of claim 10 , wherein the motion recognizer is configured to calculate an optical flow based on the set table, and perform the motion recognition based on the optical flow.

12. An event filtering device comprising:

an infrared ray lamp configured to emit an infrared ray in a pattern;

an event-based image sensor configured to detect events based on a change in an image input from a visible ray area and an infrared ray area; and

a filter configured to determine whether the pattern of the emitted infrared ray is received based on the detected events, and to ignore or accept the detected events based on a determination result,

wherein the filter is further configured to ignore a first detected event when the pattern of the emitted infrared ray is not received based on the first detected event, and to accept a second detected event when the pattern of the emitted infrared ray is received based on the second detected event, and

wherein the first detected event ignored by the filter is blocked such that motion recognition is performed based only on the second detected event accepted by the filter without the first detected event ignored by the filter.

13. The event filtering device of claim 12 , wherein the filter is configured to accept the detected events in response a determination that at least one portion of the detected events corresponds to a spatial pattern when the pattern is the spatial pattern.

14. The event filtering device of claim 12 , wherein the filter is configured to accept the detected events in response to a determination that at least one portion of the detected events comprises a frequency spectrum corresponding to a temporal pattern when the pattern is the temporal pattern.

15. The event filtering device of claim 12 , wherein the filter is configured to accept the detected events in response to a determination that at least one portion of the detected events comprises a frequency spectrum corresponding to a temporal pattern, and the at least one portion of the detected events corresponds to a spatial pattern, when the pattern is a spatiotemporal pattern that comprises the temporal pattern and the spatial pattern.

16. The event filtering device of claim 12 , wherein the event-based image sensor is configured to output an event signal including an index of a pixel in which the events are detected and a time stamp at which the events are detected.

17. The event filtering device of claim 16 , wherein the filter is configured to update a value of an element corresponding to the index and the time stamp from among a plurality of elements included in a set table based on a determination that at least one portion of the detected events is detected using the infrared ray in the pattern.

18. A motion recognition method comprising:

emitting an infrared ray in a pattern;

detecting events in a visible ray area and an infrared ray area;

determining whether at least one portion of the detected events is detected by using the emitted infrared ray in the pattern;

ignoring a first detected event among the detected events when the first detected event is not detected by using the infrared ray emitted in the pattern;

accepting a second detected event among the detected events when at least one portion of the second detected event is detected by using the infrared ray emitted in the pattern; and

performing motion recognition by blocking the first detected event such that the motion recognition is performed based only on the second detected event without the first detected event.

19. The motion recognition method of claim 18 , wherein the determining comprises:

determining whether the pattern is received based on the detected events; and

accepting the detected events based on the determining indicating receipt of the pattern.

20. A non-transitory computer-readable recording medium which stores a program that is executable by a computer to perform the motion recognition method of claim 18 .