OSD Translucency via YUV UV Component Selection
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Solution Overview
Problem
Conventional OSD techniques partially cover original images due to lack of translucency, and existing methods for achieving translucency based on RGB standards cause errors when applied to YUV-standard image signals, requiring conversion and complicating operations.
Innovation Solution
A system and method utilizing a comparator and output control unit to selectively output UV components of either video or OSD signals based on background color identification, allowing for OSD translucency without the need for signal conversion between RGB and YUV standards, using a comparator and output control unit to manage UV data output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alpha blending theory is used to realize OSD translucency, then OSD translucency effect is achieved, but device complexity increases due to multiplication device and complicated operation
Solution Approach 1:
The patent extracts the chrominance components (UV) from the video signals and selectively outputs them based on background color identification, separating the translucency control from the complex alpha blending operation. This allows OSD translucency to be achieved without requiring multiplication devices for RGB alpha blending.
Solution Approach 2:
The patent changes the approach from RGB-based alpha blending to YUV-based selective output control. By using background color identification to control which UV components are output, the system achieves translucency through parameter selection rather than complex mathematical operations.
2Reliability
If video signals and OSD signals are converted from YUV to RGB standard for alpha blending, then OSD translucency can be realized, but image display error occurs
Solution Approach 1:
The patent uses background color identification as an intermediary mechanism to control the output of UV components. Instead of converting signals between color spaces, the system uses the identified background color information to selectively output appropriate UV data, maintaining YUV standard compatibility while achieving translucency.
Solution Approach 2:
The patent replaces the mechanical signal conversion process (YUV to RGB) with a control-based approach using background color identification. This substitution eliminates the source of image display errors while maintaining the desired translucency effect.
3Ease of operation
If conventional OSD technique is used, then OSD information is displayed, but original image appearance is marred due to partial coverage
Solution Approach 1:
The patent utilizes color-based control to achieve translucency. By identifying background colors and selectively outputting UV components based on color matching, the system creates a translucent overlay effect that allows both OSD information and original image to be visible simultaneously, preventing the OSD from marring the original image appearance.
Data Source
AI summary
A device for realizing on screen display (OSD) in video signals includes a comparator (430) and an outputting control unit (440). The comparator (430) is used for receiving OSD signals and identification signals on a background color selected to be transparent in the OSD signals, identifying the background color in the OSD signals based on the identification signals, and generating a control signal based on the identification. The outputting control unit (440) is connected to the comparator (430), and is used for receiving UV components of the OSD signals, UV components of the video signals, and the control signal, and for selectively outputting UV data of the video signals or UV data of the OSD signals according to the control signal. The device simulates translucent OSD by preparing the Y and UV components of displayable YUV signals respectively from the video signals and the OSD signals.