Image Decoding Syntax Control for Selective GPM Intra Prediction

The patent changes the parameter of prediction mode selection by introducing syntax elements that control whether intra prediction modes are applied to partitioned regions in GPM. By dynamically controlling the applicability of intra prediction modes through syntax parameters, the system achieves better coding performance when beneficial while avoiding unnecessary code increases when intra prediction would not improve results.

The patent applies intra prediction modes selectively rather than universally to all partitioned regions. By using syntax elements to control applicability on a per-region basis, the system performs intra prediction only where it provides benefit, avoiding the code overhead associated with applying it everywhere.

The patent introduces dynamic control mechanisms where syntax elements determine whether GPM and intra prediction modes are applied to partitioned regions. This dynamic approach allows the decoder to adaptively process only the necessary syntax elements based on the encoded data, reducing decoding complexity while maintaining image quality where GPM provides benefit.

The patent applies different processing strategies to different partitioned regions based on local characteristics. By controlling the applicability of GPM and intra prediction modes through syntax elements on a per-region basis, the system maintains high image quality in regions where these modes are beneficial while simplifying processing in regions where they are not needed.