Hair Region Image Processing with Direction-Aware Smoothing

The patent segments the hair region into multiple sub-regions based on hairline directions, allowing different processing strategies to be applied to different areas. This segmentation enables the algorithm to preserve texture details in certain regions while still providing smoothing effects in others, thereby improving overall hair appearance quality without requiring excessive processing time across the entire region.

The patent applies local quality by using direction-aware filtering that adapts to the local hairline orientation at each pixel. Instead of applying a uniform smoothing filter, the algorithm adjusts the filtering strength and direction based on local hair texture characteristics, preserving edges and fine details in critical areas while maintaining smoothing benefits in less critical regions.

The patent performs preliminary action by first detecting and analyzing hairline directions and texture orientations before applying the smoothing filter. This pre-analysis step creates a directional map that guides the subsequent filtering process, ensuring that smoothing operations are aligned with the natural hair flow and do not blur important directional features. The directional information is preserved and used to constrain the filtering operation.

The patent applies parameter changes by dynamically adjusting the filtering parameters based on local hairline directions and texture characteristics. The filter strength, kernel size, and orientation are modified pixel-by-pixel or region-by-region according to the detected hair structure, allowing strong smoothing in areas where it benefits mix-color filtering while maintaining hairline direction integrity in areas where preservation is critical.

The patent applies universality by extending the beautification system to handle multiple types of regions with different processing requirements. The same overall framework that processes facial features and body posture is extended to also process hair regions, but with specialized hair-aware filtering algorithms. This multi-functional approach allows the system to provide comprehensive beautification across all portrait regions while maintaining high quality in each specific domain.

The patent introduces an intermediary step of hair region detection and characterization before applying beautification filters. This intermediary module identifies hair boundaries, determines hairline directions, and characterizes local texture properties, which then inform the subsequent filtering operations. This intermediary layer enables the beautification system to adapt its processing to the specific characteristics of hair regions, achieving superior enhancement quality compared to direct application of conventional filters.