Reconstructing Touch Images from Differential Data
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Solution Overview
Problem
Touch sensitive devices can only utilize differential touch images effectively, limiting their functionality due to the lack of actual image value magnitudes required for various functions, and the inability to reconstruct original touch images from differential images.
Innovation Solution
A method to reconstruct an original touch image from a differential touch image by aligning columns and restoring DC information using untouched data, which can be performed using differential image data alone or in conjunction with common mode data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a differential touch image is used to eliminate hardware and expand viewing area, then device space and thermal stability are improved, but the ability to perform functions requiring actual image value magnitudes deteriorates
Solution Approach 1:
The patent creates a copy of the original touch image by processing the differential touch image through column alignment and DC restoration. The reconstructed image replicates the magnitude information needed for various device functions while maintaining the space and thermal benefits of differential imaging.
Solution Approach 2:
The patent transforms the differential image parameters (which have zero mean and relative magnitudes) into original image parameters (with actual magnitudes and DC component) through mathematical operations including column alignment and baseline restoration, enabling full functionality.
2Reliability
If differential touch image processing is used to remove DC information, then thermal drift effects are reduced, but the loss of actual image value magnitudes increases
Solution Approach 1:
The patent performs preliminary column alignment using untouched data before restoring the DC component. This sequential approach ensures that the magnitude information is recovered in the correct reference frame, maintaining both thermal stability and magnitude accuracy.
Solution Approach 2:
The patent uses untouched data as an intermediary to facilitate the recovery of magnitude information. The untouched columns serve as a reference to determine the appropriate baseline shift needed to restore the DC component without introducing errors.
Data Source
AI summary
Reconstruction of an original touch image from a differential touch image is disclosed. Reconstruction can include aligning columns of the differential touch image relative to each other and aligning the image to a baseline DC value. The column and baseline alignment can be based on the differential image data indicative of no touch or hover, because such data can more clearly show the amount of alignment needed to reconstruct the original image. The reconstruction can be performed using the differential image data alone. The reconstruction can also be performed using the differential image data and common mode data indicative of the missing image column average.