Variable Density Transparency Layer for Readable Foreground Compositing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for compositing a presenter with presentation material often obscure or degrade the readability of text and details, particularly when using chroma key techniques, and fail to maintain essential contrast, leading to confusion in distinguishing between foreground and background elements.
Innovation Solution
The method involves converting the presenter's image into a variable density transparency 'foreground image with matte' using edge detection to determine transparency levels, allowing the background to show through smooth areas while maintaining opacity at edges, and using this matte to composite the presenter over the presentation material, ensuring readability and clear integration of both elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If chroma key or color range compositing technique is used to place graphics over background image, then background detail is prevented from showing through solid graphics areas, but this causes areas to be completely opaque that should preferably be transparent to achieve better integration of foreground and background
Solution Approach 1:
The patent applies local quality by making different regions of the foreground image have different transparency properties. Edge regions (containing text and detail) are kept opaque to maintain readability, while smooth interior regions are made transparent to allow background integration. This is achieved through edge detection algorithms that identify boundary regions and apply selective transparency masking.
Solution Approach 2:
The patent segments the foreground image into distinct regions: edge regions containing text and detail, and smooth interior regions. This segmentation allows differential transparency treatment where edge regions remain opaque for readability while interior regions become transparent for background integration, resolving the contradiction between these two requirements.
2Adaptability or versatility
If simple blending by dissolve of two images is used, then integration of foreground and background is achieved, but readability of text and detail is obscured or degraded due to loss of contrast
Solution Approach 1:
The patent applies local quality by making different regions of the foreground image have different transparency properties. Edge regions (containing text and detail) are kept opaque to maintain readability, while smooth interior regions are made transparent to allow background integration. This is achieved through edge detection algorithms that identify boundary regions and apply selective transparency masking.
Solution Approach 2:
The patent uses color and intensity analysis to identify edge regions versus smooth regions. By detecting changes in color and intensity gradients, the system can distinguish between areas requiring opacity (high gradient regions with text) and areas suitable for transparency (low gradient smooth regions), thereby maintaining readability while achieving integration.
Data Source
AI summary
The present invention converts an image into a transparency, or “foreground image layer”, on which the readability of text and other detail is preserved after compositing with a background, while maintaining color information of broad areas of the image. In an embodiment, a matte is determined for the background image to reduce transparencies in the foreground layer, so as to prevent irrelevant parts of the background image from showing through. This is in distinction to only using the original foreground image data (prior to its transformation to a layer) to compute a matte (or mask, or alpha channel) to form a foreground layer.