Motion Adaptive Anti-Aliasing Circuit for Display Image Quality
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Solution Overview
Problem
Existing image processing techniques using optical dithering to display high-resolution images on lower resolution devices often result in aliasing artifacts due to motion, which can be mitigated by low-pass filtering but at the cost of softening the image quality.
Innovation Solution
A motion adaptive anti-aliasing (MAA) circuit that applies an anti-aliasing filter only to image portions with motion, using a motion detect unit to determine the amount of motion and proportionally combine filtered and unfiltered signals to minimize softening and maintain image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a low-pass filter is applied to the high resolution image prior to down-sampling, then aliasing is reduced, but image softening occurs which negates the performance gain from high resolution
Solution Approach 1:
The patent applies different filtering treatments to different regions of the image based on motion detection. Regions with motion undergo anti-aliasing filtering, while static regions remain unfiltered to preserve sharpness. This local differentiation resolves the contradiction by applying filtering only where necessary (motion regions) rather than globally, thus reducing aliasing without causing overall image softening.
Solution Approach 2:
The patent dynamically adjusts the filtering application based on detected motion in the image sequence. The filtering operation is not static but adapts frame-by-frame and region-by-region according to motion characteristics. This dynamic approach allows the system to apply filtering only when and where motion is present, resolving the contradiction between aliasing reduction and image quality preservation.
2Ease of manufacture
If optical dithering is used to display high resolution images on lower resolution devices, then cost is reduced, but aliasing artifacts appear when motion is present
Solution Approach 1:
The patent applies anti-aliasing filtering as a preliminary operation before the down-sampling process when motion is detected. By performing this preprocessing step, the system prevents aliasing artifacts from occurring in the first place during the optical dithering display process, thus enabling cost-effective display on lower resolution devices without suffering from aliasing degradation.
Data Source
AI summary
System and method for processing image data containing motion for display on a display device. A preferred embodiment comprises applying a filter to an input image, determining a presence of motion in the input image, and generating an output image from the input image and the filtered image based upon motion in the input image. The detection of motion in the input image permits the use of filtered image data in portions of the image containing motion, thereby taking advantage of aliasing reduction provided by the filter while allowing the use of unfiltered image data in portions not containing motion. This helps to preserve image quality since filtering softens the image.