Display Pipeline De-Ringing Circuit for Scaler Ringing Artifacts
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Solution Overview
Problem
Image scaling in display pipelines can cause ringing artifacts around sharp transitions due to scaled sharp transitions in the image data.
Innovation Solution
Implementing de-ringers in scalers that detect areas with sharp transitions and blend the original polyphase scaler output with a fallback scaler output to reduce ringing artifacts, using a de-ringing algorithm that falls back to the original polyphase scaler output for high-frequency areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If image content is scaled using a polyphase scaler, then scaling efficiency is improved, but ringing artifacts are generated around sharp transitions
Solution Approach 1:
The patent segments the image processing into multiple paths: a primary polyphase scaling path for efficiency and a secondary fallback scaling path for artifact reduction. The de-ringer circuitry divides the scaled image data into regions with sharp transitions and regions without, applying different processing to each segment to resolve the contradiction between efficiency and artifact generation.
Solution Approach 2:
The patent applies local quality by detecting sharp transitions in specific regions of the image and applying de-ringing processing only to those regions. The de-ringer circuitry identifies areas with sharp transitions using gradient calculation and applies weighted combination of scaling results selectively, maintaining high efficiency in regions without artifacts while reducing ringing where it occurs.
2Manufacturing precision
If de-ringing processing is applied to reduce ringing artifacts, then image quality is improved, but processing complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-calculating gradient values to detect sharp transitions before applying de-ringing processing. The de-ringer circuitry computes gradients of the scaled image data to identify regions requiring artifact reduction, then applies weighted combination only in those regions, avoiding unnecessary processing in areas without sharp transitions.
Solution Approach 2:
The patent applies partial action by implementing de-ringing processing selectively only in regions with sharp transitions rather than across the entire image. The de-ringer circuitry uses gradient-based detection to determine where de-ringing is needed and applies weighted combination of scaling results only in those specific areas, reducing overall processing complexity while maintaining image quality where it matters most.
Data Source
AI summary
Methods and systems include receiving, at de-ringing circuitry of a display pipeline of an electronic device, scaled image content based on image data. The de-ringing circuitry also receives a fallback scaler output. The de-ringing circuitry determines whether the image data has a change frequency greater than a threshold. In response to the change frequency being above the threshold, the de-ringing circuitry determines a weight. Based at least in part on the weight, the de-ringing circuitry blends the scaled image content and the fallback scaler output based at least in part on the weight.