SYSTEMS AND METHODS FOR HORIZON LEVELING VIDEOS

1 . A system for horizon leveling videos, the system comprising:

one or more physical processors configured by machine-readable instructions to:

obtain video information defining a video, the video including visual content having a progress length, the visual content having a source field of view;

obtain viewing window placement information for the video, the viewing window placement information defining placement of a viewing window for the visual content as the function of progress through the progress length, the viewing window defining extents of the visual content to be included within horizon-leveled visual content as the function of progress through the progress length, the viewing window having a punchout field of view;

obtain constraint model information for the video, the constraint model information defining a constraint model for the video, the constraint model limiting the placement of the viewing window to places in which entirety of the punchout field of view of the viewing window is contained within the source field of view of the visual content, the constraint model generated based on a roll-pitch-yaw axes representation of viewing window placement and the punchout field of view of the viewing window fitting within the source field of view of the visual content, the constraint model covering 180 degrees of roll angle for the viewing window and enabling full horizon leveling, the roll-pitch-yaw axes representation of viewing window placement including a three-dimensional vector with a roll angle component, a pitch angle component, and a yaw angle component;

determine modified placement of the viewing window based on the placement of the viewing window failing to satisfy the constraint model for the video, wherein the placement of the viewing window failing to satisfy the constraint model for the video includes a first placement of the viewing window extending beyond a surface of the three-dimensional representation of feasible viewing window placement; and

generate the horizon-leveled visual content based on the modified placement of the viewing window, the horizon-leveled visual content including a punchout of the extents of the visual content defined by the viewing window, wherein inclusion of the extents of the visual content defined by the viewing window within the horizon-leveled visual content effectuates horizon leveling of the visual content.

2 . The system of claim 1 , wherein:

the modified placement of the viewing window is determined to maintain a roll angle of the placement of the viewing window, wherein responsive to the first placement of the viewing window including a first roll angle, the first modified placement for the first placement of the viewing window is determined to include the first roll angle; and

the modified placement of the viewing window is determined to include change in a pitch angle and/or a yaw angle of the placement of the viewing window.

3 . A system for horizon leveling videos, the system comprising:

one or more physical processors configured by machine-readable instructions to:

obtain video information defining a video, the video including visual content having a progress length, the visual content having a source field of view;

obtain viewing window placement information for the video, the viewing window placement information defining placement of a viewing window for the visual content as the function of progress through the progress length, the viewing window defining extents of the visual content to be included within horizon-leveled visual content as the function of progress through the progress length, the viewing window having a punchout field of view;

obtain constraint model information for the video, the constraint model information defining a constraint model for the video, the constraint model limiting the placement of the viewing window to places in which entirety of the punchout field of view of the viewing window is contained within the source field of view of the visual content, the constraint model covering 180 degrees of roll angle for the viewing window and enabling full horizon leveling;

determine modified placement of the viewing window based on the placement of the viewing window failing to satisfy the constraint model for the video; and

generate the horizon-leveled visual content based on the modified placement of the viewing window, the horizon-leveled visual content including a punchout of the extents of the visual content defined by the viewing window, wherein inclusion of the extents of the visual content defined by the viewing window within the horizon-leveled visual content effectuates horizon leveling of the visual content.

4 . The system of claim 3 , wherein the constraint model is generated based on a roll-pitch-yaw axes representation of viewing window placement and the punchout field of view of the viewing window fitting within the source field of view of the visual content.

5 . The system of 4 , wherein the roll-pitch-yaw axes representation of viewing window placement includes a three-dimensional vector with a roll angle component, a pitch angle component, and a yaw angle component.

6 . The system of claim 3 , wherein the constraint model includes a representation of feasible viewing window placement in which the entirety of the punchout field of view of the viewing window is contained within the source field of view of the visual content.

7 . The system of claim 6 , wherein the placement of the viewing window is decomposed by roll before pitch and yaw to prioritize horizon leveling over stabilization.

8 . The system of 6 , wherein the representation of feasible viewing window placement includes a three-dimensional representation of feasible viewing window placement.

9 . The system of 8 , wherein the placement of the viewing window failing to satisfy the constraint model for the video includes a first placement of the viewing window extending beyond a surface of the three-dimensional representation of feasible viewing window placement.

10 . The system of 9 , wherein the modified placement of the viewing window is determined to include a first modified placement for the first placement of the viewing window, the first modified placement located on the surface of the three-dimensional representation of feasible viewing window placement.

11 . The system of 10 , wherein the modified placement of the viewing window is determined to maintain a roll angle of the placement of the viewing window, wherein responsive to the first placement of the viewing window including a first roll angle, the first modified placement for the first placement of the viewing window is determined to include the first roll angle.

12 . A method for horizon leveling videos, the method performed by a computing system including one or more processors, the method comprising:

obtaining, by the computing system, video information defining a video, the video including visual content having a progress length, the visual content having a source field of view;

obtaining, by the computing system, viewing window placement information for the video, the viewing window placement information defining placement of a viewing window for the visual content as the function of progress through the progress length, the viewing window defining extents of the visual content to be included within horizon-leveled visual content as the function of progress through the progress length, the viewing window having a punchout field of view;

obtaining, by the computing system, constraint model information for the video, the constraint model information defining a constraint model for the video, the constraint model limiting the placement of the viewing window to places in which entirety of the punchout field of view of the viewing window is contained within the source field of view of the visual content, the constraint model covering 180 degrees of roll angle for the viewing window and enabling full horizon leveling;

determining, by the computing system, modified placement of the viewing window based on the placement of the viewing window failing to satisfy the constraint model for the video; and

generating, by the computing system, the horizon-leveled visual content based on the modified placement of the viewing window, the horizon-leveled visual content including a punchout of the extents of the visual content defined by the viewing window, wherein inclusion of the extents of the visual content defined by the viewing window within the horizon-leveled visual content effectuates horizon leveling of the visual content.

13 . The method of claim 12 , wherein the constraint model is generated based on a roll-pitch-yaw axes representation of viewing window placement and the punchout field of view of the viewing window fitting within the source field of view of the visual content.

14 . The method of 13 , wherein the roll-pitch-yaw axes representation of viewing window placement includes a three-dimensional vector with a roll angle component, a pitch angle component, and a yaw angle component.

15 . The method of claim 12 , wherein the constraint model includes a representation of feasible viewing window placement in which the entirety of the punchout field of view of the viewing window is contained within the source field of view of the visual content.

16 . The method of claim 15 , wherein the placement of the viewing window is decomposed by roll before pitch and yaw to prioritize horizon leveling over stabilization.

17 . The method of 15 , wherein the representation of feasible viewing window placement includes a three-dimensional representation of feasible viewing window placement.

18 . The method of 17 , wherein the placement of the viewing window failing to satisfy the constraint model for the video includes a first placement of the viewing window extending beyond a surface of the three-dimensional representation of feasible viewing window placement.

19 . The method of 18 , wherein the modified placement of the viewing window is determined to include a first modified placement for the first placement of the viewing window, the first modified placement located on the surface of the three-dimensional representation of feasible viewing window placement.

20 . The method of 19 , wherein the modified placement of the viewing window is determined to maintain a roll angle of the placement of the viewing window, wherein responsive to the first placement of the viewing window including a first roll angle, the first modified placement for the first placement of the viewing window is determined to include the first roll angle.