Hybrid Halftoning Method Modulating Dot Size and Density

The patent combines AM halftoning and FM halftoning into a hybrid approach. The system uses AM halftoning for stable dot formation while incorporating FM halftoning techniques to improve spatial resolution. This merging allows the system to achieve both print stability and high spatial resolution by leveraging the complementary strengths of both methods.

The hybrid halftoning system merges FM halftoning's high spatial resolution capability with AM halftoning's print stability. By combining both approaches, the system achieves the high spatial resolution of FM while maintaining the stable dot formation characteristic of AM, thus resolving the contradiction between these two parameters.

The patent merges AM halftoning with FM halftoning to create a hybrid system that reduces Moiré artifacts while maintaining computational efficiency. The combination allows the system to benefit from FM's ability to reduce periodic patterns that cause Moiré effects, while preserving AM's computational simplicity through the use of clustered dot screening.

The patent transitions from traditional two-dimensional screen periods to a three-dimensional approach by varying dot cluster sizes and densities across multiple intensity levels. This dimensional change allows the system to render more gray levels without proportionally increasing the screen period area, as the hybrid approach efficiently utilizes both dot size modulation and dot density modulation.