Display Apparatus Laser Pointer Detection via Difference Image
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Solution Overview
Problem
Advances in display devices and video signal processing have widened the color range of displayable images, leading to incorrect recognition of image spots and unreliable detection of laser-pointer-based pointing operations.
Innovation Solution
A display apparatus that generates a difference image between a captured image and an original image, allowing for improved precision in detecting laser-pointer actions by avoiding wrong recognition due to shared color ranges and extracting light spots not present in the original image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the color range of displayable images is widened through advances in display devices and video signal processing, then the display quality and color performance are improved, but wrong recognition of image spots and unsuccessful detection of laser pointers occur more frequently
Solution Approach 1:
The patent introduces a difference image as an intermediary representation between the captured image and the original image. By computing the difference between these two images, the system creates a new image representation where laser pointer spots stand out distinctly from the displayed content, even when both share similar color ranges. This intermediary difference image serves as a mediator that resolves the conflict between wide color range display and reliable spot detection.
2Difficulty of detecting and measuring
If selective detection of light in a predetermined wavelength region is used to distinguish laser spots from displayed images, then spot detection is enabled, but wrong recognition occurs when the displayed image contains colors within the same wavelength region
Solution Approach 1:
The patent employs temporal dynamics by capturing images at multiple time points and computing difference images that show changes over time. Instead of relying on a static wavelength-based detection method, the system dynamically compares the captured image with the original image to identify spots that appear or change. This dynamic approach allows the system to distinguish laser spots from displayed content even when they share the same color characteristics, thereby improving detection precision without sacrificing detection capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables reliable detection and precise identification of laser-pointer actions, enhancing the accuracy of spot detection and pointing operations by analyzing temporal changes in the difference image.
Implementation Method 1
an imaging section that captures the displayed image displayed on the display surface by the display section
Data Source
AI summary
A display apparatus includes a display section that displays a displayed image on a display surface based on an original image, an imaging section that captures the displayed image displayed on the display surface by the display section, a generation section that generates a difference image representing a difference between a captured image produced by the imaging section that captures the displayed image and the original image, and an instruction section that instructs the display apparatus to take a predetermined action based on a temporal change in the difference image generated by the generation section.