IPT Text Sharpening for Legibility and Display Power Savings

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing information handling systems face challenges in enhancing text legibility while optimizing display power savings, particularly in managing edge artifacts, noise enhancement, and adapting to ambient light conditions.

Innovation Solution

The system converts RGB pixels to IPT pixels, sharpens image brightness using a digital filter, corrects edge overshoot and undershoot, reduces noise, and adjusts backlight based on ambient light and user distance to optimize text readability and power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If text sharpening is applied to enhance legibility, then text readability improves, but edge artifacts and noise enhancement occur

Engineering Contradiction:

Improvetext legibilityVSAvoidedge artifacts and noise

Core Design Contradiction:

Measurement precisionVSObject-generated harmful factors

Solution Approach 1:

The patent segments the image processing into distinct components: converting RGB pixels to IPT (Image Perspective Transformation) pixels to separate luminance and chrominance information, applying sharpening only to luminance components, and selectively correcting edge artifacts. This segmentation allows text sharpening to improve legibility while isolating and reducing harmful edge artifacts and noise in the chrominance channels.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies local quality by selectively sharpening only the luminance component of the image while leaving chrominance unchanged, and by applying edge artifact correction specifically to regions with detected overshoot or undershoot. This localized approach enhances text legibility where needed while preserving color accuracy and minimizing noise enhancement in non-critical areas.

Inventive Principle:

Principle #3Local quality

2Use of energy by moving object

If display power is reduced to save energy, then power consumption decreases, but text legibility deteriorates

Engineering Contradiction:

Improvedisplay power consumptionVSAvoidtext readability

Core Design Contradiction:

Use of energy by moving objectVSMeasurement precision

Solution Approach 1:

The patent applies preliminary action by pre-processing the image with text sharpening and edge artifact correction before display. This enhances text legibility in advance, allowing the display to operate at lower power levels while maintaining readability. The image processing prepares the content to be more legible at reduced brightness or contrast settings.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes image parameters through IPT conversion and selective sharpening operations, transforming the image into a form that requires less display power for equivalent legibility. By modifying the luminance and chrominance separation and applying targeted sharpening, the image achieves better text visibility characteristics that reduce the power needed for display.

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If digital filtering is applied to sharpen text edges, then text definition improves, but edge overshoot and undershoot artifacts are created

Engineering Contradiction:

Improvetext edge definitionVSAvoidedge overshoot and undershoot

Core Design Contradiction:

Manufacturing precisionVSObject-generated harmful factors

Solution Approach 1:

The patent converts the harmful edge overshoot and undershoot artifacts into beneficial information by detecting these artifacts and using them to guide corrective processing. The edge artifact correction algorithm identifies regions with overshoot or undershoot and applies targeted adjustments that eliminate the artifacts while preserving the enhanced text edge definition. This transforms the previously harmful filtering artifacts into opportunities for refined edge processing.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

4Object-generated harmful factors

If noise reduction filtering is applied, then image quality improves, but text edge sharpness deteriorates

Engineering Contradiction:

Improvenoise levelVSAvoidtext edge sharpness

Core Design Contradiction:

Object-generated harmful factorsVSManufacturing precision

Solution Approach 1:

The patent segments noise reduction from the sharpening process by working in the IPT color space and applying different processing to luminance and chrominance components. Noise reduction is applied selectively to the chrominance channels while preserving the sharpened luminance edges, or by applying adaptive filtering that maintains edge sharpness while reducing noise in uniform regions. This segmentation allows simultaneous noise reduction and edge preservation.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12354246B2Text sharpening for legibility enhancement or display power savings

Publication Date: 2025.07.08 DELL PROD LP

AI summary

An information handling system includes a display device and a processor. The display device outputs pixels associated with a text font. The processor converts red, green, blue (RGB) pixels to image perspective transformation (IPT) pixels. The processor further sharpens one or more of the IPT pixels that do not have color. The sharpening of the one or more of the IPT pixels identifies edges of the text font and defines widths of the text font. The processor corrects edge overshoot and edge undershoot created by a digital filter. The edge overshoot and the edge undershoot are corrected for each IPT pixel associated with the text edges. The processor also reduces noise enhancement in the sharpened IPT pixels, retains grey text portions of each of the sharpened IPT pixels, and converts the IPT pixels to new RGB pixels. The processor outputs the new RGB pixels to the display device.