Image processing apparatus and method for removing noise from a frame group
An image processing apparatus for removing noise from a frame group on a timeline is provided. This image processing apparatus includes a judgment unit, a division unit, and a removal unit. The judgment unit judges whether changing points where there is a large change between adjacent frames included in the frame group appear at roughly the same interval along the timeline. The division unit, in a case where it is judged that the changing points appear at roughly the same interval, divides the frame group into a plurality of groupings along the timeline in accordance with the interval. The removal unit removes noise from the frame group in units of the groupings.
1. An image processing apparatus configured to remove noise from a frame group on a timeline, comprising:
a judgment unit configured to identify changing points along the timeline, each of the changing points being a point where there is a large change between adjacent frames included in the frame group, and judge whether a pattern exists whereby the changing points appear at roughly a same interval along the timeline;
a division unit configured to, in a case where it is judged that there is a pattern whereby the changing points appear at roughly the same interval, divide the frame group into a plurality of groupings along the timeline in accordance with the interval determined by said judgment unit; and
a removal unit configured to remove noise from the frame group in units of the groupings, wherein the removal unit is configured to perform the noise removal for each grouping, using frames belonging to the grouping other than an exclusion frame, the exclusion frame being a frame commonly corresponding to a plurality of changing points that appear successively along the timeline,
wherein the removal unit is configured to generate, for each grouping, Y number of representative frames representing X number of frames belonging to the grouping, where X≧2 and Y<X.
2. The image processing apparatus according to claim 1 , wherein Y=1.
3. The image processing apparatus according to claim 2 , wherein the removal unit is configured to perform the noise removal for each grouping, by averaging two or more frames belonging to the grouping.
4. The image processing apparatus according to claim 2 , wherein the frame group is a frame group that is captured by an image capture apparatus and recorded by a recording apparatus having a higher frame rate than the image capture apparatus.
5. The image processing apparatus according to claim 1 , wherein the removal unit is configured to perform the noise removal for each grouping, by averaging two or more frames belonging to the grouping.
6. The image processing apparatus according to claim 1 , wherein the frame group is a frame group that is captured by an image capture apparatus and recorded by a recording apparatus having a higher frame rate than the image capture apparatus.
7. An image processing apparatus configured to remove noise from a frame group on a timeline, comprising:
a judgment unit configured to identify changing points along the timeline, each of the changing points being a point where there is a large change between adjacent frames included in the frame group, and judge whether a pattern exists whereby the changing points appear at roughly a same interval along the timeline;
a division unit configured to, in a case where it is judged that there is a pattern whereby the changing points appear at roughly the same interval, divide the frame group into a plurality of groupings along the timeline in accordance with the interval determined by said judgment unit; and
a removal unit configured to remove noise from the frame group in units of the groupings, wherein the removal unit is configured to perform the noise removal for each grouping, using frames belonging to the grouping other than an exclusion frame, the exclusion frame being a frame commonly corresponding to a plurality of changing points that appear successively along the timeline,
wherein the removal unit is configured to perform the noise removal for each grouping, by averaging two or more frames belonging to the grouping.
8. The image processing apparatus according to claim 7 , wherein the frame group is a frame group that is captured by an image capture apparatus and recorded by a recording apparatus having a higher frame rate than the image capture apparatus.
9. An image processing apparatus configured to remove noise from a frame group on a timeline, comprising:
a judgment unit configured to identify changing points along the timeline, each of the changing points being a point where there is a large change between adjacent frames included in the frame group, and judge whether a pattern exists whereby the changing points appear at roughly a same interval along the timeline;
a division unit configured to, in a case where it is judged that there is a pattern whereby the changing points appear at roughly the same interval, divide the frame group into a plurality of groupings along the timeline in accordance with the interval determined by said judgment unit; and
a removal unit configured to remove noise from the frame group in units of the groupings, wherein the removal unit is configured to perform the noise removal for each grouping, using frames belonging to the grouping other than an exclusion frame, the exclusion frame being a frame commonly corresponding to a plurality of changing points that appear successively along the timeline,
wherein the frame group is a frame group that is captured by an image capture apparatus and recorded by a recording apparatus having a higher frame rate than the image capture apparatus.
10. An image processing apparatus configured to remove noise from a frame group on a timeline, comprising:
a judgment unit configured to judge whether changing points where there is a large change between adjacent frames included in the frame group appear at roughly the same interval along the timeline;
a division unit configured to, in a case where it is judged that the changing points appear at roughly the same interval, divide the frame group into a plurality of groupings along the timeline in accordance with the interval; and
a removal unit configured to remove noise from the frame group in units of the groupings, wherein the removal unit is configured to perform the noise removal for each grouping, using frames belonging to the grouping other than an exclusion frame, the exclusion frame being a frame commonly corresponding to a plurality of changing points that appear successively along the timeline.
11. The image processing apparatus according to claim 10 ,
wherein the removal unit is configured to generate, for each grouping, Y number of representative frames representing X number of frames belonging to the grouping, where X≧2 and Y<X.
12. The image processing apparatus according to claim 11 ,
wherein Y=1.