Video Signal Interpolation Using Static-Coefficient Delay Filtering
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Solution Overview
Problem
Existing methods for generating continuous plots from discrete sampled data require complex digital filters that change coefficients for each iteration, leading to computational complexity and the need for frequent reconfiguration, whereas a simpler approach is needed to produce a substantially continuous line plot without altering coefficients.
Innovation Solution
A digital filter with predetermined static coefficients is used, where a variable delay is applied to generate interpolated values between sample points, allowing for a more continuous plot without changing coefficients, using a Farrow configuration with stages having incremental coefficient differences or randomized delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If complex digital filters that change coefficients for each iteration are used to generate continuous plots from discrete sampled data, then the plot continuity is improved, but the computational complexity increases and frequent reconfiguration is required
Solution Approach 1:
The patent pre-calculates and stores multiple sets of filter coefficients in advance, corresponding to different time intervals between discrete sampled points. During operation, the system simply selects and applies the appropriate pre-stored coefficient set based on the current time interval, eliminating the need for real-time coefficient calculation and reducing computational complexity while maintaining plot continuity
Solution Approach 2:
The patent dynamically selects different filter coefficient sets based on the time interval between sampled points. The system adapts to varying time intervals by switching between pre-stored coefficient sets, allowing the filter to maintain optimal performance across different sampling conditions without requiring complex real-time coefficient adjustment mechanisms
2Measurement precision
If filter coefficients are changed frequently to produce interpolated values between sample points, then the interpolation accuracy is improved, but the reconfiguration frequency increases
Solution Approach 1:
The patent pre-calculates and stores multiple sets of filter coefficients in advance, corresponding to different time intervals between discrete sampled points. During operation, the system simply selects and applies the appropriate pre-stored coefficient set based on the current time interval, eliminating the need for real-time coefficient calculation and reducing computational complexity while maintaining plot continuity
Solution Approach 2:
The patent changes the filter coefficients in discrete steps by selecting from pre-stored coefficient sets corresponding to different time intervals. This approach maintains interpolation accuracy by using appropriate coefficients for each interval while avoiding the need for continuous or frequent coefficient reconfiguration, thus improving productivity
Data Source
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AI summary
A video display for digitized video data interpolates values between time samples, such as luminance over a horizontal line or over an average of all the horizontal lines in a video signal, so as to produce a digitally plotted test display resembling the continuous line display of an oscilloscope. A digital impulse response filter has stored coefficients that contribute as factors to the values of interpolated data points to fill the line display between sample values. Instead of changing the coefficients to produce variations interpolating the output between sample values, the coefficients are held constant and a delay factor is varied to alter the extent to which the respective coefficients and sample values interact and contribute to the interpolated values.