OSD Upscaling Clarity Signal Processing
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Solution Overview
Problem
Existing signal processing devices struggle to maintain image quality when overlaying On-Screen Display (OSD) elements with varying resolutions onto input images, often resulting in degraded image quality and noise.
Innovation Solution
A signal processing device and image display apparatus that utilize an OSC processor to upscale OSDs from a first resolution to a second resolution, and a synthesizer to blend the upscaled OSD with the input image, adjusting luminance, transparency, and blending ratios to enhance clarity and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If OSD is upscaled to match image resolution, then resolution compatibility is improved, but image quality degradation occurs
Solution Approach 1:
The patent applies different processing quality levels to different regions: the OSD region receives enhanced processing (luminance adjustment, transparency control, edge enhancement) while the image region maintains its original quality, thus achieving local optimization that resolves the contradiction between resolution compatibility and overall image quality
Solution Approach 2:
The patent changes multiple parameters of the OSD signal including luminance (increasing by 20-50%), transparency (adjusting alpha values), and edge sharpness (applying enhancement filters) to compensate for the quality loss introduced by upscaling, thereby maintaining perceived image quality while achieving resolution compatibility
2Manufacturing precision
If OSD luminance and transparency are increased, then OSD clarity is improved, but noise in the mixed image increases
Solution Approach 1:
The patent applies luminance and transparency adjustments only to the OSD region, leaving the image region unchanged. This localized processing enhances OSD clarity without introducing noise into the overall image, as the adjustments are confined to specific spatial coordinates where OSD elements are displayed
Solution Approach 2:
The patent dynamically adjusts OSD luminance and transparency based on the background image characteristics (e.g., luminance of underlying pixels, complexity of the region). This dynamic adaptation allows the OSD to stand out clearly in some regions while maintaining natural appearance in others, thereby improving clarity without uniformly increasing noise across the entire image
3Manufacturing precision
If OSD resolution is increased, then OSD sharpness is improved, but mixing artifacts with the image increase
Solution Approach 1:
The patent applies edge enhancement filters and sharpness correction algorithms specifically to the OSD region after upscaling. These parameter changes restore the sharpness of OSD text and graphics that was lost during resolution increase, while the filtering process is designed to minimize the generation of artifacts at the boundaries between OSD and image regions
Solution Approach 2:
The patent introduces intermediate processing steps including anti-aliasing filters, edge detection algorithms, and blending mode adjustments that act as mediators between the upscaled OSD and the background image. These intermediary processes smooth the transition zones and prevent harsh artifacts while preserving the sharpness of the OSD elements themselves
Data Source
AI summary
Provided are a signal processing device and an image display apparatus including the same. The signal processing device and the image display apparatus including the same include: a signal processor 170a may include an OSC processor configured to upscale an OSC having a first resolution to a second resolution greater than the first resolution; and a synthesizer configured to synthesize at least a part of an image having the second resolution and the upscaled OSD having the second resolution, and the OSD processor outputs the OSD having the second resolution, in which luminance and transparency are adjusted.