Dithered Image Data Generation for Stereoscopic 3D Displays
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Solution Overview
Problem
The existing methods for displaying stereoscopic 3D images using liquid crystal shutter glasses suffer from a dithering noise phenomenon, characterized by flickering and horizontal-line patterns, which are not effectively addressed by conventional dithering techniques.
Innovation Solution
A method and apparatus for generating dithered image data that ensures adjacent odd and even frames have the same or different dithered image data, using a data processor to add dither sub-pixel values to image sub-pixel values, thereby preventing the dithering noise phenomenon in 3D image displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional dithering techniques are applied to 3D image display, then the number of gray levels is increased, but dithering noise phenomenon such as flickering and horizontal-line patterns occurs
Solution Approach 1:
The image data is divided into multiple frames (odd frames and even frames) that are displayed alternately to the left eye and right eye. Dithering is applied separately to each frame type, with odd frames receiving one dither pattern and even frames receiving another dither pattern. This segmentation allows the dithering noise to be distributed across different temporal and spatial domains, preventing the accumulation of visible artifacts while maintaining gray level precision.
Solution Approach 2:
Different dither patterns are applied to different frame types (odd vs. even frames). Specifically, odd frames use a first dither pattern while even frames use a second dither pattern. This local differentiation in dithering approach ensures that no single persistent dither pattern creates visible noise, while each individual frame maintains its gray level precision through dithering.
2Reliability
If dithering is applied to increase gray levels in 3D display, then image quality is improved, but flickering and horizontal-line patterns appear on the screen
Solution Approach 1:
The display system alternates between odd frames and even frames in a periodic manner, with odd frames displayed during odd time periods and even frames during even time periods. Each frame type has its own dither pattern applied. This periodic alternation prevents the persistence of any single dither pattern, thereby eliminating flickering and horizontal-line patterns while maintaining high image quality through consistent dithering across all frames.
Data Source
AI summary
A method and apparatus capable of reducing or preventing dithering noises in 3D dither for displaying stereoscopic or 3D images are provided. The method entails generating image data in which two consecutive frames have the same dithered image data.