VR Toolbox

The exact offset from one frame to the next can be calculated through the frame count, field of view and image size, which is the predicted offset of the source images. In reality, though, the predicted offset is rarely achieved. If this is the case, the Frame Offset Tolerance dialog can be used to instruct the program on how far it must search in order to position the offset between source images. To specify the tolerance of the source image offsets, the operator should modify the vertical and horizontal sliders located in this dialog.

Vertical Tolerance - Vertical tolerance is the range that adjacent images must be shifted up or down in order for stitching to occur. This can be caused by several factors, such as a bumped or windblown tripod or a camera that is not mounted perpendicular to its axis of rotation. The default settings used for the vertical tolerance should accommodate most source images that are not stitched correctly. In some instances, the vertical tolerance must be incremented to increase the vertical search range that is used when comparing adjacent images.
Horizontal Tolerance - The horizontal tolerance must be adjusted when the overlap spacing between adjacent images is inconsistent.One sure sign of the need to increase vertical or horizontal tolerance is a stair-stepped sequence of source images that do not quite make proper stitches. In this instance, increasing the tolerance one notch at a time and restitching may solve the problem. The process may be repeated, if necessary, increasing upward for vertical tolerance and to the left for horizontal tolerance. Once the correct tolerance settings have been found, those settings can be used for all future panoramas (assuming the source imagery is consistently stairstepped) by saving a stationery template.

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