Patent ID: 7236169

Claim:
A geometric processing stage for a pipelined engine for processing video signals and generating therefrom processed video signal in space coordinates (S) adapted for display on a screen, said geometric processing stage comprising: a model view module for generating projection coordinates of primitives of said video signals in a view space, said primitives including visible and non-visible primitives; a back face culling module arranged downstream of said model view module for at least partially eliminating said non-visible primitives; a projection transform module for transforming coordinates of said video signals from said view space coordinates into normalized projection coordinates (P); and a perspective divide module for transforming coordinates of said video signals from said normalized projection (P) coordinates into said screen space coordinates (S); wherein; said back face culling module is arranged downstream of said projection transform module and operates on normalized projection (P) coordinates of said primitives; said perspective divide module is arranged downstream said back face culling module for transforming the coordinates of said video signals from said normalized projection (P) coordinates into said screen space coordinates (S); and wherein said back face culling module is configured for performing a perspective division (S=P/Pw) for transforming said screen coordinates (S) into said normalized projection (P) coordinates.