Ink Lag Compensation via Predictive Stroke Extension
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Solution Overview
Problem
Traditional techniques for rendering ink strokes on computing devices often result in significant lag between input and display, leading to a disconnected user experience due to the artificial 'look and feel' of pen and paper interaction.
Innovation Solution
The implementation of ink lag compensation techniques, where the computing device predicts and displays an extension of an ink stroke based on input, reducing perceived lag by setting frame latency to a single frame and adjusting predictions according to subsequent inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional ink rendering techniques are used, then the system is simple and stable, but significant lag occurs between input and display
Solution Approach 1:
The system performs preliminary action by predicting the extension of the ink stroke before the user actually completes it. The computing device analyzes the current stroke trajectory and predicts where it will continue, displaying this predicted extension concurrently with the actual ink stroke. This anticipatory rendering eliminates the perceived lag by showing the stroke's continuation before the user finishes drawing it.
Solution Approach 2:
The rendering system dynamically adjusts frame latency to a single frame and continuously updates the predicted extension based on subsequent user inputs. When the user's actual stroke continues along the predicted path, the extension is maintained and refined. This dynamic adaptation allows the system to maintain simplicity while achieving fast, responsive display performance.
2Loss of time
If frame latency is reduced to a single frame, then display responsiveness improves, but rendering precision may be affected
Solution Approach 1:
The system employs feedback by continuously monitoring subsequent user inputs to verify whether the predicted extension matches the user's actual drawing intent. When the user continues the stroke along the predicted path, the system confirms the prediction is accurate. This feedback loop allows the system to maintain single-frame latency while preserving rendering precision through continuous validation and adjustment of predictions.
Data Source
AI summary
Ink lag compensation techniques are described. In implementations, an input is recognized by a computing device as an ink stroke to be rendered on a display device of the computing device. An extension is predicted, by the computing device, to be applied to the ink stroke that is likely to be subsequently input in conjunction with the ink stroke. The ink stroke and the extension are output for concurrent display on the display device of the computing device.