Video stabilization
Aspects of the technology described herein provide a method of editing video to improve the apparent stability of the video footage. In one aspect, the apparent stability of the video image is improved by adding a border around an image captured within individual video frames and adjusting the relative position of consecutive video frames according to a negative of a movement vector calculated between the two consecutive frames.
1. A computing system comprising:
a processor; and
computer storage media having computer-executable instructions stored thereon which, when executed by the processor, implement a method of video editing to correct for camera movement during video recording, the method comprising:
receiving a video comprising a plurality of frames, each frame having an original height and width;
generating a plurality of bordered frames by adding a border around a perimeter of individual video frames from the plurality of frames;
calculating a motion vector that expresses a movement of a video camera while filming the video; and
generating a stabilized video by recombining the plurality of bordered frames and correcting for the movement by adjusting a location of individual frames relative to other frames using the motion vector,
wherein a width of the border is an average of the motion vector for each frame in the video plus a standard deviation of the average of the motion vector.
2. The computing system of claim 1 , wherein a bordered frame has an increased height and width that is larger than the original height and width.
3. The computing system of claim 1 , wherein a bordered frame has a height and width that is equal to the original height and width.
4. The computing system of claim 1 , wherein the border has a width that is greater than 5% of the original height.
5. The computing system of claim 1 , wherein the processor is a graphics processing unit.
6. The computing system of claim 1 , wherein portions of an image from an earlier frame in the video are not added to subsequent frames.
7. One or more computer storage media storing computer-executable instructions that, when executed by a computing device having a processor, cause the computing device to generate a stabilized video, the method comprising:
receiving a video comprising a plurality of video frames;
generating a plurality of bordered frames by adding a border around a perimeter of individual video frames;
calculating a motion vector that expresses a movement of a video camera while filming the video; and
generating a stabilized video by recombining the plurality of bordered frames and correcting for the movement by adjusting a location of individual frames relative to other frames using the motion vector,
wherein a width of the border is an average of the motion vector for each frame in the video plus a standard deviation of the average of the motion vector.
8. The media of claim 7 , wherein adding the border comprises shrinking an image in a frame by a percentage and adding the border from a perimeter of a shrunken image to an original outside perimeter of the image.
9. The media of claim 8 , wherein the percentage is between 10% and 20%.
10. The media of claim 7 , wherein adding the border comprises adding the border that extends from a perimeter of original images in the individual video frames, the border having a width.
11. The media of claim 10 , wherein the width is about 15% of a width of the original images.
12. The media of claim 7 , wherein the border is black.
13. The media of claim 7 , wherein portions of an image from an earlier frame in the video are not added to subsequent frames.
14. A video editing method comprising:
receiving a video comprising a plurality of frames, each frame having an original height and width;
generating a plurality of bordered frames by adding a border around a perimeter of individual video frames from the plurality of frames, wherein individual bordered frames have an increased height and width that is larger than the original height and width;
calculating a motion vector that expresses a movement of a video camera while recording the video; and
generating a stabilized video by recombining the plurality of bordered frames and correcting for the movement by adjusting a location of individual frames relative to other frames using the motion vector,
wherein a width of the border is an average of the motion vector for each frame in the video plus a standard deviation of the average of the motion vector.
15. The method of claim 14 , wherein the increased height and width are more than 5% larger than the original height and width.
16. The method of claim 14 , wherein the increased height and width are more than 10% larger than the original height and width.
17. The method of claim 14 , wherein the increased height and width are more than 20% larger than the original height and width.
18. The method of claim 14 , wherein each frame in the plurality of frames includes an image having a height, width, and resolution that is not changed when the border is added to the frame.
19. The method of claim 14 , wherein images from an earlier frame in the video are not added to subsequent frames.
20. The method of claim 14 , wherein the border is black.