Interpolation Pixel Circuit Correlation Noise Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing interpolation pixel generation circuits in plasma and liquid crystal display devices often produce interpolation pixels with large luminance differences, leading to noise issues, particularly when surrounding pixels have varying luminance levels.
Innovation Solution
An interpolation pixel generation circuit that calculates correlation values for pairs of pixels symmetrically positioned across scanning lines, determines correlation directions, and generates interpolation pixels based on average values from selected pairs to minimize luminance discrepancies and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the average of pixel values of pixels with the highest correlation is calculated to generate an interpolation pixel, then the interpolation pixel can be generated using simple averaging, but the luminance difference between the interpolation pixel and surrounding pixels becomes large causing noise
Solution Approach 1:
The patent changes the parameter used for correlation measurement from simple pixel value averaging to correlation coefficient calculation. By using correlation coefficients that measure the relationship between pixel value changes rather than absolute values, the system can identify pixels with similar patterns even when their absolute luminance values differ significantly, thus reducing noise while maintaining calculation simplicity
Solution Approach 2:
The patent replaces the mechanical averaging process with a correlation-based selection process. Instead of directly averaging pixel values, the system first calculates correlation coefficients to identify the most correlated pixel pairs, then uses these correlations to guide the interpolation process, substituting direct arithmetic averaging with a two-step correlation-aware process
2Measurement precision
If pixels with the highest correlation are used to generate the interpolation pixel, then the interpolation can capture dominant patterns, but it fails to consider pixels with lower correlation that may provide important contextual information
Solution Approach 1:
The patent segments the correlation assessment into multiple levels by calculating correlation coefficients for multiple pixel pairs at different positions relative to the interpolation point. Instead of relying on a single correlation metric, the system evaluates correlations from multiple directions and distances, segmenting the overall correlation assessment into manageable components that can be processed independently and combined for the final interpolation decision
Solution Approach 2:
The patent applies partial action by using correlation coefficients as a filtering mechanism that selectively includes only the most relevant pixel pairs while ignoring less correlated ones. This partial selection approach prevents information overload from all surrounding pixels while ensuring that the most informative pixels are included in the interpolation calculation
Data Source
AI summary
In an interpolation pixel generation circuit, M pairs and N pairs (N<M) of correlation judgment pixels are generated from pixels on at least two scanning lines which adjoin a pixel to be interpolated, using one pair of pixels being symmetric with respect to the pixel to be interpolated. A correlation value between pixel values of a correlation judgment pair is calculated in each M pairs and N pairs of correlation judgment pixels. Correlation judging pairs having high correlation are selected, and correlation direction is judged. Based on the both judged correlation direction of M pairs and the N pairs of correlation judgment pixels, an interpolation priority direction is determined from a slant priority direction, a vertical priority direction, and a vertical top priority direction. An interpolation pixel is generated, which pixel value is an average of pixel values of the selected correlation judgment pixels being in the determined direction.