System and method for improving visual appearance of efficient rotation algorithm

摘要

A write order of a rotation/reorientation algorithm, which converts a source image to a target image with a different type orientation, is modified to reflect an order of a vertical trace at a target display. If the algorithm is triggered by the same signal as the trigger signal for a vertical blanking interval, the new write order dramatically improves the likelihood that there will be no tear effect at all. As long as the rotation/reorientation algorithm can stay ahead of the vertical trace, no visible tear effect can be seen. If the algorithm is unable to stay ahead of the vertical trace, visual quality is still improved by making the tear effects more closely resemble clean breaks than potential stair-step effects. Stair-steps are more noticeable to viewers than clean tears, resulting in an improved visual experience for the viewer.