We introduced the concept of edge points in the Stitching with Mistika VR article when discussing ghosting artifacts that may appear when optical flow is activated. Optical flow is a powerful method for aligning overlapping image pixels between adjacent lenses in an immersive video, however there are a number of scenarios where it may produce undesirable artifacts such as ghosting, misalignment or rippling. To address these, a single edge point may be sufficient, or multiple edge points may need to be added. They can be scaled, feathered and repositioned as needed, and their parameters can be animated over time to remove artifacts as scene elements move across the shot.
To work with edge points, first toggle on both the Camera Overlay and Feather Overlay from the menu at the bottom of the Visual Editor. The overlay displays the camera areas and their names as C1, C2, C3, etc. and also shows the feather line between adjacent cameras. Cameras can be interactively selected by clicking on them in overlay display in the Visual Editor. The overlay indicates which camera is currently active when adding, selecting and editing edge points.