Patent ID: 8917281

Claim:
An image rendering method comprising: comparing a current image frame with a previous image frame to detect a dynamic change in at least one object in the image frames, with each image frame being defined by a scene graph and each object having an associated geometric bounding volume; responsive to dynamic change being detected in each of the at least one object, rendering each of the at least one object's geometric bounding volume to a stencil buffer, using a stencil value assigned to the current image frame, the stencil buffer having a stencil register for each pixel; applying a stencil test to determine areas in the current image frame and the previous image frame having non-zero stencil values; rendering the current image frame to a color buffer using the stencil test, so that only the areas with non-zero stencil values are redrawn; and removing stencil values from the previous image frame and a frame preceeding the previous image frame from the stencil buffer.